/* * %CopyrightBegin% * * Copyright Ericsson AB 1996-2011. All Rights Reserved. * * The contents of this file are subject to the Erlang Public License, * Version 1.1, (the "License"); you may not use this file except in * compliance with the License. You should have received a copy of the * Erlang Public License along with this software. If not, it can be * retrieved online at http://www.erlang.org/. * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See * the License for the specific language governing rights and limitations * under the License. * * %CopyrightEnd% */ #define ERL_PROCESS_C__ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include /* offsetof() */ #include "sys.h" #include "erl_vm.h" #include "global.h" #include "erl_process.h" #include "erl_nmgc.h" #include "error.h" #include "bif.h" #include "erl_db.h" #include "dist.h" #include "beam_catches.h" #include "erl_instrument.h" #include "erl_threads.h" #include "erl_binary.h" #include "beam_bp.h" #include "erl_cpu_topology.h" #define ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED (2000*CONTEXT_REDS) #define ERTS_RUNQ_CALL_CHECK_BALANCE_REDS \ (ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED/2) #define ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST (CONTEXT_REDS/10) #define ERTS_SCHED_SPIN_UNTIL_YIELD 100 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT 10 #define ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT 1000 #define ERTS_SCHED_TSE_SLEEP_SPINCOUNT \ (ERTS_SCHED_SYS_SLEEP_SPINCOUNT*ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT) #define ERTS_SCHED_SUSPEND_SLEEP_SPINCOUNT 0 #define ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH (200*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_HIGH (50*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_MEDIUM (10*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_LOW (CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW (CONTEXT_REDS/10) #define ERTS_WAKEUP_OTHER_DEC 10 #define ERTS_WAKEUP_OTHER_FIXED_INC (CONTEXT_REDS/10) #if 0 || defined(DEBUG) #define ERTS_FAKE_SCHED_BIND_PRINT_SORTED_CPU_DATA #endif #if defined(DEBUG) && 0 #define HARDDEBUG #else #undef HARDDEBUG #endif #ifdef HARDDEBUG #define HARDDEBUG_RUNQS #endif #ifdef HIPE #include "hipe_mode_switch.h" /* for hipe_init_process() */ #include "hipe_signal.h" /* for hipe_thread_signal_init() */ #endif #ifdef ERTS_ENABLE_LOCK_COUNT #include "erl_lock_count.h" #endif #define MAX_BIT (1 << PRIORITY_MAX) #define HIGH_BIT (1 << PRIORITY_HIGH) #define NORMAL_BIT (1 << PRIORITY_NORMAL) #define LOW_BIT (1 << PRIORITY_LOW) #define ERTS_MAYBE_SAVE_TERMINATING_PROCESS(P) \ do { \ ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&proc_tab_mtx)); \ if (saved_term_procs.end) \ save_terminating_process((P)); \ } while (0) #define ERTS_EMPTY_RUNQ(RQ) \ ((RQ)->len == 0 && (RQ)->misc.start == NULL) extern BeamInstr beam_apply[]; extern BeamInstr beam_exit[]; extern BeamInstr beam_continue_exit[]; static Sint p_last; static Sint p_next; static Sint p_serial; static Uint p_serial_mask; static Uint p_serial_shift; Uint erts_no_schedulers; Uint erts_max_processes = ERTS_DEFAULT_MAX_PROCESSES; Uint erts_process_tab_index_mask; static int wakeup_other_limit; int erts_sched_thread_suggested_stack_size = -1; #ifdef ERTS_ENABLE_LOCK_CHECK ErtsLcPSDLocks erts_psd_required_locks[ERTS_PSD_SIZE]; #endif #ifdef ERTS_SMP int erts_disable_proc_not_running_opt; #define ERTS_SCHDLR_SSPND_CHNG_WAITER (((erts_aint32_t) 1) << 0) #define ERTS_SCHDLR_SSPND_CHNG_MSB (((erts_aint32_t) 1) << 1) #define ERTS_SCHDLR_SSPND_CHNG_ONLN (((erts_aint32_t) 1) << 2) #ifndef DEBUG #define ERTS_SCHDLR_SSPND_CHNG_SET(VAL, OLD_VAL) \ erts_smp_atomic32_set(&schdlr_sspnd.changing, (VAL)) #else #define ERTS_SCHDLR_SSPND_CHNG_SET(VAL, OLD_VAL) \ do { \ erts_aint32_t old_val__; \ old_val__ = erts_smp_atomic32_xchg(&schdlr_sspnd.changing, \ (VAL)); \ ASSERT(old_val__ == (OLD_VAL)); \ } while (0) #endif static struct { erts_smp_mtx_t mtx; erts_smp_cnd_t cnd; int online; int curr_online; int wait_curr_online; erts_smp_atomic32_t changing; erts_smp_atomic32_t active; struct { erts_smp_atomic32_t ongoing; long wait_active; ErtsProcList *procs; } msb; /* Multi Scheduling Block */ } schdlr_sspnd; static struct { erts_smp_mtx_t update_mtx; erts_smp_atomic32_t no_runqs; int last_active_runqs; int forced_check_balance; erts_smp_atomic32_t checking_balance; int halftime; int full_reds_history_index; struct { int active_runqs; int reds; int max_len; } prev_rise; Uint n; } balance_info; #define ERTS_BLNCE_SAVE_RISE(ACTIVE, MAX_LEN, REDS) \ do { \ balance_info.prev_rise.active_runqs = (ACTIVE); \ balance_info.prev_rise.max_len = (MAX_LEN); \ balance_info.prev_rise.reds = (REDS); \ } while (0) #endif erts_sched_stat_t erts_sched_stat; ErtsRunQueue *erts_common_run_queue; #ifdef USE_THREADS static erts_tsd_key_t sched_data_key; #endif static erts_smp_mtx_t proc_tab_mtx; static erts_smp_atomic32_t function_calls; #ifdef ERTS_SMP static erts_smp_atomic32_t doing_sys_schedule; static erts_smp_atomic32_t no_empty_run_queues; #else /* !ERTS_SMP */ ErtsSchedulerData *erts_scheduler_data; #endif ErtsAlignedRunQueue *erts_aligned_run_queues; Uint erts_no_run_queues; ErtsAlignedSchedulerData *erts_aligned_scheduler_data; #ifdef ERTS_SMP typedef union { ErtsSchedulerSleepInfo ssi; char align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(ErtsSchedulerSleepInfo))]; } ErtsAlignedSchedulerSleepInfo; static ErtsAlignedSchedulerSleepInfo *aligned_sched_sleep_info; #endif #ifndef BM_COUNTERS static int processes_busy; #endif Process** process_tab; static Uint last_reductions; static Uint last_exact_reductions; Uint erts_default_process_flags; Eterm erts_system_monitor; Eterm erts_system_monitor_msg_queue_len; Eterm erts_system_monitor_long_gc; Eterm erts_system_monitor_large_heap; struct erts_system_monitor_flags_t erts_system_monitor_flags; /* system performance monitor */ Eterm erts_system_profile; struct erts_system_profile_flags_t erts_system_profile_flags; #ifdef HYBRID Uint erts_num_active_procs; Process** erts_active_procs; #endif #if ERTS_MAX_PROCESSES > 0x7fffffff #error "Need to store process_count in another type" #endif static erts_smp_atomic32_t process_count; typedef struct ErtsTermProcElement_ ErtsTermProcElement; struct ErtsTermProcElement_ { ErtsTermProcElement *next; ErtsTermProcElement *prev; int ix; union { struct { Eterm pid; SysTimeval spawned; SysTimeval exited; } process; struct { SysTimeval time; } bif_invocation; } u; }; static struct { ErtsTermProcElement *start; ErtsTermProcElement *end; } saved_term_procs; ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(misc_op_list, ErtsMiscOpList, 10, ERTS_ALC_T_MISC_OP_LIST) ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(proclist, ErtsProcList, 200, ERTS_ALC_T_PROC_LIST) #define ERTS_SCHED_SLEEP_INFO_IX(IX) \ (ASSERT_EXPR(0 <= (IX) && (IX) < erts_no_schedulers), \ &aligned_sched_sleep_info[(IX)].ssi) #define ERTS_FOREACH_RUNQ(RQVAR, DO) \ do { \ ErtsRunQueue *RQVAR; \ int ix__; \ for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) { \ RQVAR = ERTS_RUNQ_IX(ix__); \ erts_smp_runq_lock(RQVAR); \ { DO; } \ erts_smp_runq_unlock(RQVAR); \ } \ } while (0) #define ERTS_FOREACH_OP_RUNQ(RQVAR, DO) \ do { \ ErtsRunQueue *RQVAR; \ int ix__; \ ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&schdlr_sspnd.mtx)); \ for (ix__ = 0; ix__ < schdlr_sspnd.online; ix__++) { \ RQVAR = ERTS_RUNQ_IX(ix__); \ erts_smp_runq_lock(RQVAR); \ { DO; } \ erts_smp_runq_unlock(RQVAR); \ } \ } while (0) #define ERTS_ATOMIC_FOREACH_RUNQ_X(RQVAR, DO, DOX) \ do { \ ErtsRunQueue *RQVAR; \ int ix__; \ for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) { \ RQVAR = ERTS_RUNQ_IX(ix__); \ erts_smp_runq_lock(RQVAR); \ { DO; } \ } \ { DOX; } \ for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) \ erts_smp_runq_unlock(ERTS_RUNQ_IX(ix__)); \ } while (0) #define ERTS_ATOMIC_FOREACH_RUNQ(RQVAR, DO) \ ERTS_ATOMIC_FOREACH_RUNQ_X(RQVAR, DO, ) /* * Local functions. */ static void init_processes_bif(void); static void save_terminating_process(Process *p); static void exec_misc_ops(ErtsRunQueue *); static void print_function_from_pc(int to, void *to_arg, BeamInstr* x); static int stack_element_dump(int to, void *to_arg, Process* p, Eterm* sp, int yreg); #ifdef ERTS_SMP static void handle_pending_exiters(ErtsProcList *); #endif #if defined(ERTS_SMP) && defined(ERTS_ENABLE_LOCK_CHECK) int erts_smp_lc_runq_is_locked(ErtsRunQueue *runq) { return erts_smp_lc_mtx_is_locked(&runq->mtx); } #endif void erts_pre_init_process(void) { #ifdef USE_THREADS erts_tsd_key_create(&sched_data_key); #endif #ifdef ERTS_ENABLE_LOCK_CHECK { int ix; erts_psd_required_locks[ERTS_PSD_ERROR_HANDLER].get_locks = ERTS_PSD_ERROR_HANDLER_BUF_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_ERROR_HANDLER].set_locks = ERTS_PSD_ERROR_HANDLER_BUF_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_SAVED_CALLS_BUF].get_locks = ERTS_PSD_SAVED_CALLS_BUF_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_SAVED_CALLS_BUF].set_locks = ERTS_PSD_SAVED_CALLS_BUF_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_SCHED_ID].get_locks = ERTS_PSD_SCHED_ID_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_SCHED_ID].set_locks = ERTS_PSD_SCHED_ID_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].get_locks = ERTS_PSD_DIST_ENTRY_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].set_locks = ERTS_PSD_DIST_ENTRY_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_CALL_TIME_BP].get_locks = ERTS_PSD_CALL_TIME_BP_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_CALL_TIME_BP].set_locks = ERTS_PSD_CALL_TIME_BP_SET_LOCKS; /* Check that we have locks for all entries */ for (ix = 0; ix < ERTS_PSD_SIZE; ix++) { ERTS_SMP_LC_ASSERT(erts_psd_required_locks[ix].get_locks); ERTS_SMP_LC_ASSERT(erts_psd_required_locks[ix].set_locks); } } #endif } /* initialize the scheduler */ void erts_init_process(int ncpu) { Uint proc_bits = ERTS_PROC_BITS; #ifdef ERTS_SMP erts_disable_proc_not_running_opt = 0; erts_init_proc_lock(ncpu); #endif init_proclist_alloc(); erts_smp_atomic32_init(&process_count, 0); if (erts_use_r9_pids_ports) { proc_bits = ERTS_R9_PROC_BITS; ASSERT(erts_max_processes <= (1 << ERTS_R9_PROC_BITS)); } process_tab = (Process**) erts_alloc(ERTS_ALC_T_PROC_TABLE, erts_max_processes*sizeof(Process*)); sys_memzero(process_tab, erts_max_processes * sizeof(Process*)); #ifdef HYBRID erts_active_procs = (Process**) erts_alloc(ERTS_ALC_T_ACTIVE_PROCS, erts_max_processes * sizeof(Process*)); erts_num_active_procs = 0; #endif erts_smp_mtx_init(&proc_tab_mtx, "proc_tab"); p_last = -1; p_next = 0; p_serial = 0; p_serial_shift = erts_fit_in_bits(erts_max_processes - 1); p_serial_mask = ((~(~((Uint) 0) << proc_bits)) >> p_serial_shift); erts_process_tab_index_mask = ~(~((Uint) 0) << p_serial_shift); #ifndef BM_COUNTERS processes_busy = 0; #endif last_reductions = 0; last_exact_reductions = 0; erts_default_process_flags = 0; } void erts_late_init_process(void) { int ix; init_processes_bif(); erts_smp_spinlock_init(&erts_sched_stat.lock, "sched_stat"); for (ix = 0; ix < ERTS_NO_PRIO_LEVELS; ix++) { Eterm atom; char *atom_str; switch (ix) { case PRIORITY_MAX: atom_str = "process_max"; break; case PRIORITY_HIGH: atom_str = "process_high"; break; case PRIORITY_NORMAL: atom_str = "process_normal"; break; case PRIORITY_LOW: atom_str = "process_low"; break; case ERTS_PORT_PRIO_LEVEL: atom_str = "port"; break; default: atom_str = "bad_prio"; ASSERT(!"bad prio"); break; } atom = am_atom_put(atom_str, sys_strlen(atom_str)); erts_sched_stat.prio[ix].name = atom; erts_sched_stat.prio[ix].total_executed = 0; erts_sched_stat.prio[ix].executed = 0; erts_sched_stat.prio[ix].total_migrated = 0; erts_sched_stat.prio[ix].migrated = 0; } } static ERTS_INLINE ErtsProcList * proclist_create(Process *p) { ErtsProcList *plp = proclist_alloc(); plp->pid = p->id; plp->started = p->started; return plp; } static ERTS_INLINE void proclist_destroy(ErtsProcList *plp) { proclist_free(plp); } static ERTS_INLINE int proclist_same(ErtsProcList *plp, Process *p) { return (plp->pid == p->id && erts_cmp_timeval(&plp->started, &p->started) == 0); } ErtsProcList * erts_proclist_create(Process *p) { return proclist_create(p); } void erts_proclist_destroy(ErtsProcList *plp) { proclist_destroy(plp); } int erts_proclist_same(ErtsProcList *plp, Process *p) { return proclist_same(plp, p); } void * erts_psd_set_init(Process *p, ErtsProcLocks plocks, int ix, void *data) { void *old; ErtsProcLocks xplocks; int refc = 0; ErtsPSD *psd = erts_alloc(ERTS_ALC_T_PSD, sizeof(ErtsPSD)); int i; for (i = 0; i < ERTS_PSD_SIZE; i++) psd->data[i] = NULL; ERTS_SMP_LC_ASSERT(plocks); ERTS_SMP_LC_ASSERT(plocks == erts_proc_lc_my_proc_locks(p)); xplocks = ERTS_PROC_LOCKS_ALL; xplocks &= ~plocks; if (xplocks && erts_smp_proc_trylock(p, xplocks) == EBUSY) { if (xplocks & ERTS_PROC_LOCK_MAIN) { erts_smp_proc_inc_refc(p); erts_smp_proc_unlock(p, plocks); erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL); refc = 1; } else { if (plocks & ERTS_PROC_LOCKS_ALL_MINOR) erts_smp_proc_unlock(p, plocks & ERTS_PROC_LOCKS_ALL_MINOR); erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR); } } if (!p->psd) p->psd = psd; if (xplocks) erts_smp_proc_unlock(p, xplocks); if (refc) erts_smp_proc_dec_refc(p); ASSERT(p->psd); if (p->psd != psd) erts_free(ERTS_ALC_T_PSD, psd); old = p->psd->data[ix]; p->psd->data[ix] = data; ERTS_SMP_LC_ASSERT(plocks == erts_proc_lc_my_proc_locks(p)); return old; } #ifdef ERTS_SMP void erts_sched_finish_poke(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flags) { switch (flags & ERTS_SSI_FLGS_SLEEP_TYPE) { case ERTS_SSI_FLG_POLL_SLEEPING: erts_sys_schedule_interrupt(1); break; case ERTS_SSI_FLG_TSE_SLEEPING: erts_tse_set(ssi->event); break; case 0: break; default: erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error\n", __FILE__, __LINE__); break; } } typedef struct erts_misc_aux_work_t_ erts_misc_aux_work_t; struct erts_misc_aux_work_t_ { erts_misc_aux_work_t *next; void (*func)(void *); void *arg; }; typedef struct { erts_smp_mtx_t mtx; erts_misc_aux_work_t *first; erts_misc_aux_work_t *last; } erts_misc_aux_work_q_t; typedef union { erts_misc_aux_work_q_t data; char align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(erts_misc_aux_work_q_t))]; } erts_algnd_misc_aux_work_q_t; static erts_algnd_misc_aux_work_q_t *misc_aux_work_queues; ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(misc_aux_work, erts_misc_aux_work_t, 200, ERTS_ALC_T_MISC_AUX_WORK) static void init_misc_aux_work(void) { int ix; init_misc_aux_work_alloc(); misc_aux_work_queues = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_MISC_AUX_WORK_Q, erts_no_schedulers * sizeof(erts_algnd_misc_aux_work_q_t)); for (ix = 0; ix < erts_no_schedulers; ix++) { erts_smp_mtx_init_x(&misc_aux_work_queues[ix].data.mtx, "misc_aux_work_queue", make_small(ix + 1)); misc_aux_work_queues[ix].data.first = NULL; misc_aux_work_queues[ix].data.last = NULL; } } static void handle_misc_aux_work(ErtsSchedulerData *esdp) { int ix = (int) esdp->no - 1; erts_misc_aux_work_t *mawp; erts_smp_mtx_lock(&misc_aux_work_queues[ix].data.mtx); mawp = misc_aux_work_queues[ix].data.first; misc_aux_work_queues[ix].data.first = NULL; misc_aux_work_queues[ix].data.last = NULL; erts_smp_mtx_unlock(&misc_aux_work_queues[ix].data.mtx); while (mawp) { erts_misc_aux_work_t *free_mawp; mawp->func(mawp->arg); free_mawp = mawp; mawp = mawp->next; misc_aux_work_free(free_mawp); } } void erts_smp_schedule_misc_aux_work(int ignore_self, int max_sched, void (*func)(void *), void *arg) { int ix, ignore_ix = -1; if (ignore_self) { ErtsSchedulerData *esdp = erts_get_scheduler_data(); if (esdp) ignore_ix = (int) esdp->no - 1; } ASSERT(0 <= max_sched && max_sched <= erts_no_schedulers); for (ix = 0; ix < max_sched; ix++) { erts_aint32_t aux_work; erts_misc_aux_work_t *mawp; ErtsSchedulerSleepInfo *ssi; if (ix == ignore_ix) continue; mawp = misc_aux_work_alloc(); mawp->func = func; mawp->arg = arg; mawp->next = NULL; erts_smp_mtx_lock(&misc_aux_work_queues[ix].data.mtx); if (!misc_aux_work_queues[ix].data.last) misc_aux_work_queues[ix].data.first = mawp; else misc_aux_work_queues[ix].data.last->next = mawp; misc_aux_work_queues[ix].data.last = mawp; erts_smp_mtx_unlock(&misc_aux_work_queues[ix].data.mtx); ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); aux_work = erts_smp_atomic32_bor(&ssi->aux_work, ERTS_SSI_AUX_WORK_MISC); if ((aux_work & ERTS_SSI_AUX_WORK_MISC) == 0) erts_sched_poke(ssi); } } #ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN void erts_smp_notify_check_children_needed(void) { int i; for (i = 0; i < erts_no_schedulers; i++) { erts_aint32_t aux_work; ErtsSchedulerSleepInfo *ssi; ssi = ERTS_SCHED_SLEEP_INFO_IX(i); aux_work = erts_smp_atomic32_bor(&ssi->aux_work, ERTS_SSI_AUX_WORK_CHECK_CHILDREN); if (!(aux_work & ERTS_SSI_AUX_WORK_CHECK_CHILDREN)) erts_sched_poke(ssi); } } #endif #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK static ERTS_INLINE erts_aint32_t blockable_aux_work(ErtsSchedulerData *esdp, ErtsSchedulerSleepInfo *ssi, erts_aint32_t aux_work) { if (aux_work & ERTS_SSI_BLOCKABLE_AUX_WORK_MASK) { if (aux_work & ERTS_SSI_AUX_WORK_MISC) { aux_work = erts_smp_atomic32_band(&ssi->aux_work, ~ERTS_SSI_AUX_WORK_MISC); aux_work &= ~ERTS_SSI_AUX_WORK_MISC; handle_misc_aux_work(esdp); } #ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN if (aux_work & ERTS_SSI_AUX_WORK_CHECK_CHILDREN) { aux_work = erts_smp_atomic32_band(&ssi->aux_work, ~ERTS_SSI_AUX_WORK_CHECK_CHILDREN); aux_work &= ~ERTS_SSI_AUX_WORK_CHECK_CHILDREN; erts_check_children(); } #endif } return aux_work; } #endif #ifdef ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK static ERTS_INLINE erts_aint32_t nonblockable_aux_work(ErtsSchedulerData *esdp, ErtsSchedulerSleepInfo *ssi, erts_aint32_t aux_work) { if (aux_work & ERTS_SSI_NONBLOCKABLE_AUX_WORK_MASK) { } } #endif static void prepare_for_block(void *vrq) { erts_smp_runq_unlock((ErtsRunQueue *) vrq); } static void resume_after_block(void *vrq) { erts_smp_runq_lock((ErtsRunQueue *) vrq); } #endif static ERTS_INLINE void sched_waiting_sys(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); ASSERT(rq->waiting >= 0); rq->flags |= (ERTS_RUNQ_FLG_OUT_OF_WORK | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK); rq->waiting++; rq->waiting *= -1; rq->woken = 0; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_inactive); } static ERTS_INLINE void sched_active_sys(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); ASSERT(rq->waiting < 0); rq->waiting *= -1; rq->waiting--; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_active); } Uint erts_active_schedulers(void) { /* RRRRRRRRR */ Uint as = erts_no_schedulers; ERTS_ATOMIC_FOREACH_RUNQ(rq, as -= abs(rq->waiting)); ASSERT(as >= 0); return as; } #ifdef ERTS_SMP static ERTS_INLINE void clear_sys_scheduling(void) { erts_smp_atomic32_set_relb(&doing_sys_schedule, 0); } static ERTS_INLINE int try_set_sys_scheduling(void) { return 0 == erts_smp_atomic32_cmpxchg_acqb(&doing_sys_schedule, 1, 0); } #endif static ERTS_INLINE int prepare_for_sys_schedule(void) { #ifdef ERTS_SMP while (!erts_port_task_have_outstanding_io_tasks() && try_set_sys_scheduling()) { if (!erts_port_task_have_outstanding_io_tasks()) return 1; clear_sys_scheduling(); } return 0; #else return !erts_port_task_have_outstanding_io_tasks(); #endif } #ifdef ERTS_SMP static ERTS_INLINE void sched_change_waiting_sys_to_waiting(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); ASSERT(rq->waiting < 0); rq->waiting *= -1; } static ERTS_INLINE void sched_waiting(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); rq->flags |= (ERTS_RUNQ_FLG_OUT_OF_WORK | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK); if (rq->waiting < 0) rq->waiting--; else rq->waiting++; rq->woken = 0; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_inactive); } static ERTS_INLINE void sched_active(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); if (rq->waiting < 0) rq->waiting++; else rq->waiting--; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_active); } static int ERTS_INLINE ongoing_multi_scheduling_block(void) { return erts_smp_atomic32_read(&schdlr_sspnd.msb.ongoing) != 0; } static ERTS_INLINE void empty_runq(ErtsRunQueue *rq) { erts_aint32_t oifls = erts_smp_atomic32_band(&rq->info_flags, ~ERTS_RUNQ_IFLG_NONEMPTY); if (oifls & ERTS_RUNQ_IFLG_NONEMPTY) { #ifdef DEBUG erts_aint32_t empty = erts_smp_atomic32_read(&no_empty_run_queues); /* * For a short period of time no_empty_run_queues may have * been increased twice for a specific run queue. */ ASSERT(0 <= empty && empty < 2*erts_no_run_queues); #endif erts_smp_atomic32_inc(&no_empty_run_queues); } } static ERTS_INLINE void non_empty_runq(ErtsRunQueue *rq) { erts_aint32_t oifls = erts_smp_atomic32_bor(&rq->info_flags, ERTS_RUNQ_IFLG_NONEMPTY); if (!(oifls & ERTS_RUNQ_IFLG_NONEMPTY)) { #ifdef DEBUG erts_aint32_t empty = erts_smp_atomic32_read(&no_empty_run_queues); /* * For a short period of time no_empty_run_queues may have * been increased twice for a specific run queue. */ ASSERT(0 < empty && empty <= 2*erts_no_run_queues); #endif erts_smp_atomic32_dec(&no_empty_run_queues); } } static erts_aint32_t sched_prep_spin_wait(ErtsSchedulerSleepInfo *ssi) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING); erts_aint32_t xflgs = 0; do { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; xflgs = oflgs; } while (!(oflgs & ERTS_SSI_FLG_SUSPENDED)); return oflgs; } static erts_aint32_t sched_prep_cont_spin_wait(ErtsSchedulerSleepInfo *ssi) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING); erts_aint32_t xflgs = ERTS_SSI_FLG_WAITING; do { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; xflgs = oflgs; nflgs |= oflgs & ERTS_SSI_FLG_SUSPENDED; } while (oflgs & ERTS_SSI_FLG_WAITING); return oflgs; } static erts_aint32_t sched_spin_wait(ErtsSchedulerSleepInfo *ssi, int spincount) { int until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; int sc = spincount; erts_aint32_t flgs; do { flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if ((flgs & (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) != (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) { break; } ERTS_SPIN_BODY; if (--until_yield == 0) { until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; erts_thr_yield(); } } while (--sc > 0); return flgs; } static erts_aint32_t sched_set_sleeptype(ErtsSchedulerSleepInfo *ssi, erts_aint32_t sleep_type) { erts_aint32_t oflgs; erts_aint32_t nflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING|sleep_type; erts_aint32_t xflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING; if (sleep_type == ERTS_SSI_FLG_TSE_SLEEPING) erts_tse_reset(ssi->event); while (1) { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; if ((oflgs & (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) != (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) { return oflgs; } xflgs = oflgs; nflgs |= oflgs & ERTS_SSI_FLG_SUSPENDED; } } #define ERTS_SCHED_WAIT_WOKEN(FLGS) \ (((FLGS) & (ERTS_SSI_FLG_WAITING|ERTS_SSI_FLG_SUSPENDED)) \ != ERTS_SSI_FLG_WAITING) static void scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq) { ErtsSchedulerSleepInfo *ssi = esdp->ssi; int spincount; erts_aint32_t flgs; #if defined(ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK) \ || defined(ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK) erts_aint32_t aux_work; #endif ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); erts_smp_spin_lock(&rq->sleepers.lock); flgs = sched_prep_spin_wait(ssi); if (flgs & ERTS_SSI_FLG_SUSPENDED) { /* Go suspend instead... */ erts_smp_spin_unlock(&rq->sleepers.lock); return; } ssi->prev = NULL; ssi->next = rq->sleepers.list; if (rq->sleepers.list) rq->sleepers.list->prev = ssi; rq->sleepers.list = ssi; erts_smp_spin_unlock(&rq->sleepers.lock); /* * If all schedulers are waiting, one of them *should* * be waiting in erl_sys_schedule() */ if (!prepare_for_sys_schedule()) { sched_waiting(esdp->no, rq); erts_smp_runq_unlock(rq); spincount = ERTS_SCHED_TSE_SLEEP_SPINCOUNT; tse_wait: #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); tse_blockable_aux_work: aux_work = blockable_aux_work(esdp, ssi, aux_work); #endif erts_smp_activity_begin(ERTS_ACTIVITY_WAIT, NULL, NULL, NULL); while (1) { #ifdef ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK #ifndef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); #endif nonblockable_aux_work(esdp, ssi, aux_work); #endif flgs = sched_spin_wait(ssi, spincount); if (flgs & ERTS_SSI_FLG_SLEEPING) { ASSERT(flgs & ERTS_SSI_FLG_WAITING); flgs = sched_set_sleeptype(ssi, ERTS_SSI_FLG_TSE_SLEEPING); if (flgs & ERTS_SSI_FLG_SLEEPING) { int res; ASSERT(flgs & ERTS_SSI_FLG_TSE_SLEEPING); ASSERT(flgs & ERTS_SSI_FLG_WAITING); do { res = erts_tse_wait(ssi->event); } while (res == EINTR); } } if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); break; } flgs = sched_prep_cont_spin_wait(ssi); spincount = ERTS_SCHED_TSE_SLEEP_SPINCOUNT; if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); break; } #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); if (aux_work & ERTS_SSI_BLOCKABLE_AUX_WORK_MASK) { erts_smp_activity_end(ERTS_ACTIVITY_WAIT, NULL, NULL, NULL); goto tse_blockable_aux_work; } #endif } erts_smp_activity_end(ERTS_ACTIVITY_WAIT, NULL, NULL, NULL); if (flgs & ~ERTS_SSI_FLG_SUSPENDED) erts_smp_atomic32_band(&ssi->flags, ERTS_SSI_FLG_SUSPENDED); erts_smp_runq_lock(rq); sched_active(esdp->no, rq); } else { erts_aint_t dt; erts_smp_atomic32_set_relb(&function_calls, 0); *fcalls = 0; sched_waiting_sys(esdp->no, rq); erts_smp_runq_unlock(rq); spincount = ERTS_SCHED_SYS_SLEEP_SPINCOUNT; while (spincount-- > 0) { sys_poll_aux_work: ASSERT(!erts_port_task_have_outstanding_io_tasks()); erl_sys_schedule(1); /* Might give us something to do */ dt = erts_do_time_read_and_reset(); if (dt) erts_bump_timer(dt); sys_aux_work: #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); aux_work = blockable_aux_work(esdp, ssi, aux_work); #endif #ifdef ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK #ifndef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); #endif nonblockable_aux_work(esdp, ssi, aux_work); #endif flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); goto sys_woken; } /* * If we got new I/O tasks we aren't allowed to * call erl_sys_schedule() until it is handled. */ if (erts_port_task_have_outstanding_io_tasks()) { clear_sys_scheduling(); /* * Got to check that we still got I/O tasks; otherwise * we have to continue checking for I/O... */ if (!prepare_for_sys_schedule()) { spincount *= ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT; goto tse_wait; } } } erts_smp_runq_lock(rq); /* * If we got new I/O tasks we aren't allowed to * sleep in erl_sys_schedule(). */ if (erts_port_task_have_outstanding_io_tasks()) { clear_sys_scheduling(); /* * Got to check that we still got I/O tasks; otherwise * we have to wait in erl_sys_schedule() after all... */ if (prepare_for_sys_schedule()) goto do_sys_schedule; /* * Not allowed to wait in erl_sys_schedule; * do tse wait instead... */ sched_change_waiting_sys_to_waiting(esdp->no, rq); erts_smp_runq_unlock(rq); spincount = 0; goto tse_wait; } else { do_sys_schedule: erts_sys_schedule_interrupt(0); flgs = sched_set_sleeptype(ssi, ERTS_SSI_FLG_POLL_SLEEPING); if (!(flgs & ERTS_SSI_FLG_SLEEPING)) { if (!(flgs & ERTS_SSI_FLG_WAITING)) goto sys_locked_woken; erts_smp_runq_unlock(rq); flgs = sched_prep_cont_spin_wait(ssi); if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); goto sys_woken; } ASSERT(!erts_port_task_have_outstanding_io_tasks()); goto sys_poll_aux_work; } ASSERT(flgs & ERTS_SSI_FLG_POLL_SLEEPING); ASSERT(flgs & ERTS_SSI_FLG_WAITING); erts_smp_runq_unlock(rq); ASSERT(!erts_port_task_have_outstanding_io_tasks()); erl_sys_schedule(0); dt = erts_do_time_read_and_reset(); if (dt) erts_bump_timer(dt); flgs = sched_prep_cont_spin_wait(ssi); if (flgs & ERTS_SSI_FLG_WAITING) goto sys_aux_work; sys_woken: erts_smp_runq_lock(rq); sys_locked_woken: clear_sys_scheduling(); if (flgs & ~ERTS_SSI_FLG_SUSPENDED) erts_smp_atomic32_band(&ssi->flags, ERTS_SSI_FLG_SUSPENDED); sched_active_sys(esdp->no, rq); } } ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); } static ERTS_INLINE erts_aint32_t ssi_flags_set_wake(ErtsSchedulerSleepInfo *ssi) { /* reset all flags but suspended */ erts_aint32_t oflgs; erts_aint32_t nflgs = 0; erts_aint32_t xflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING; while (1) { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return oflgs; nflgs = oflgs & ERTS_SSI_FLG_SUSPENDED; xflgs = oflgs; } } static void wake_scheduler(ErtsRunQueue *rq, int incq, int one) { ErtsSchedulerSleepInfo *ssi; ErtsSchedulerSleepList *sl; /* * The unlocked run queue is not strictly necessary * from a thread safety or deadlock prevention * perspective. It will, however, cost us performance * if it is locked during wakup of another scheduler, * so all code *should* handle this without having * the lock on the run queue. */ ERTS_SMP_LC_ASSERT(!erts_smp_lc_runq_is_locked(rq)); sl = &rq->sleepers; erts_smp_spin_lock(&sl->lock); ssi = sl->list; if (!ssi) erts_smp_spin_unlock(&sl->lock); else if (one) { erts_aint32_t flgs; if (ssi->prev) ssi->prev->next = ssi->next; else { ASSERT(sl->list == ssi); sl->list = ssi->next; } if (ssi->next) ssi->next->prev = ssi->prev; erts_smp_spin_unlock(&sl->lock); ERTS_THR_MEMORY_BARRIER; flgs = ssi_flags_set_wake(ssi); erts_sched_finish_poke(ssi, flgs); if (incq && !erts_common_run_queue && (flgs & ERTS_SSI_FLG_WAITING)) non_empty_runq(rq); } else { sl->list = NULL; erts_smp_spin_unlock(&sl->lock); ERTS_THR_MEMORY_BARRIER; do { ErtsSchedulerSleepInfo *wake_ssi = ssi; ssi = ssi->next; erts_sched_finish_poke(wake_ssi, ssi_flags_set_wake(wake_ssi)); } while (ssi); } } static void wake_all_schedulers(void) { if (erts_common_run_queue) wake_scheduler(erts_common_run_queue, 0, 0); else { int ix; for (ix = 0; ix < erts_no_run_queues; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); wake_scheduler(rq, 0, 1); } } } #define ERTS_NO_USED_RUNQS_SHIFT 16 #define ERTS_NO_RUNQS_MASK 0xffff #if ERTS_MAX_NO_OF_SCHEDULERS > ERTS_NO_RUNQS_MASK # error "Too large amount of schedulers allowed" #endif static ERTS_INLINE void init_no_runqs(int active, int used) { erts_aint32_t no_runqs = (erts_aint32_t) (active & ERTS_NO_RUNQS_MASK); no_runqs |= (erts_aint32_t) ((used & ERTS_NO_RUNQS_MASK) << ERTS_NO_USED_RUNQS_SHIFT); erts_smp_atomic32_init(&balance_info.no_runqs, no_runqs); } static ERTS_INLINE void get_no_runqs(int *active, int *used) { erts_aint32_t no_runqs = erts_smp_atomic32_read(&balance_info.no_runqs); if (active) *active = (int) (no_runqs & ERTS_NO_RUNQS_MASK); if (used) *used = (int) ((no_runqs >> ERTS_NO_USED_RUNQS_SHIFT) & ERTS_NO_RUNQS_MASK); } static ERTS_INLINE void set_no_used_runqs(int used) { erts_aint32_t exp = erts_smp_atomic32_read(&balance_info.no_runqs); while (1) { erts_aint32_t act, new; new = (used << ERTS_NO_USED_RUNQS_SHIFT) | (exp & ERTS_NO_RUNQS_MASK); act = erts_smp_atomic32_cmpxchg(&balance_info.no_runqs, new, exp); if (act == exp) break; exp = act; } } static ERTS_INLINE void set_no_active_runqs(int active) { erts_aint32_t exp = erts_smp_atomic32_read(&balance_info.no_runqs); while (1) { erts_aint32_t act, new; new = (exp & (ERTS_NO_RUNQS_MASK << ERTS_NO_USED_RUNQS_SHIFT)) | active; act = erts_smp_atomic32_cmpxchg(&balance_info.no_runqs, new, exp); if (act == exp) break; exp = act; } } static ERTS_INLINE int try_inc_no_active_runqs(int active) { erts_aint32_t exp = erts_smp_atomic32_read(&balance_info.no_runqs); if (((exp >> ERTS_NO_USED_RUNQS_SHIFT) & ERTS_NO_RUNQS_MASK) < active) return 0; if ((exp & ERTS_NO_RUNQS_MASK) + 1 == active) { erts_aint32_t new, act; new = (exp & ~ERTS_NO_RUNQS_MASK) | active; act = erts_smp_atomic32_cmpxchg(&balance_info.no_runqs, new, exp); if (act == exp) return 1; } return 0; } static ERTS_INLINE int chk_wake_sched(ErtsRunQueue *crq, int ix, int activate) { erts_aint32_t iflgs; ErtsRunQueue *wrq; if (crq->ix == ix) return 0; wrq = ERTS_RUNQ_IX(ix); iflgs = erts_smp_atomic32_read(&wrq->info_flags); if (!(iflgs & (ERTS_RUNQ_IFLG_SUSPENDED|ERTS_RUNQ_IFLG_NONEMPTY))) { if (activate) { if (try_inc_no_active_runqs(ix+1)) { erts_smp_xrunq_lock(crq, wrq); wrq->flags &= ~ERTS_RUNQ_FLG_INACTIVE; erts_smp_xrunq_unlock(crq, wrq); } } wake_scheduler(wrq, 0, 1); return 1; } return 0; } static void wake_scheduler_on_empty_runq(ErtsRunQueue *crq) { int ix = crq->ix; int stop_ix = ix; int active_ix, balance_ix; get_no_runqs(&active_ix, &balance_ix); if (active_ix > balance_ix) active_ix = balance_ix; if (ix >= active_ix) stop_ix = ix = active_ix; /* Try to wake a scheduler on an active run queue */ while (1) { ix--; if (ix < 0) { if (active_ix == stop_ix) break; ix = active_ix - 1; } if (ix == stop_ix) break; if (chk_wake_sched(crq, ix, 0)) return; } if (active_ix < balance_ix) { /* Try to activate a new run queue and wake its scheduler */ (void) chk_wake_sched(crq, active_ix, 1); } } #endif /* ERTS_SMP */ static ERTS_INLINE void smp_notify_inc_runq(ErtsRunQueue *runq) { #ifdef ERTS_SMP if (runq) wake_scheduler(runq, 1, 1); #endif } void erts_smp_notify_inc_runq(ErtsRunQueue *runq) { smp_notify_inc_runq(runq); } void erts_sched_notify_check_cpu_bind(void) { #ifdef ERTS_SMP int ix; if (erts_common_run_queue) { for (ix = 0; ix < erts_no_schedulers; ix++) erts_smp_atomic32_set_relb(&ERTS_SCHEDULER_IX(ix)->chk_cpu_bind, 1); wake_all_schedulers(); } else { for (ix = 0; ix < erts_no_run_queues; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); erts_smp_runq_lock(rq); rq->flags |= ERTS_RUNQ_FLG_CHK_CPU_BIND; erts_smp_runq_unlock(rq); wake_scheduler(rq, 0, 1); }; } #else erts_sched_check_cpu_bind(erts_get_scheduler_data()); #endif } #ifdef ERTS_SMP ErtsRunQueue * erts_prepare_emigrate(ErtsRunQueue *c_rq, ErtsRunQueueInfo *c_rqi, int prio) { ASSERT(ERTS_CHK_RUNQ_FLG_EMIGRATE(c_rq->flags, prio)); ASSERT(ERTS_CHK_RUNQ_FLG_EVACUATE(c_rq->flags, prio) || c_rqi->len >= c_rqi->migrate.limit.this); while (1) { ErtsRunQueue *n_rq = c_rqi->migrate.runq; ERTS_DBG_VERIFY_VALID_RUNQP(n_rq); erts_smp_xrunq_lock(c_rq, n_rq); /* * erts_smp_xrunq_lock() may release lock on c_rq! We have * to check that we still want to emigrate and emigrate * to the same run queue as before. */ if (ERTS_CHK_RUNQ_FLG_EMIGRATE(c_rq->flags, prio)) { Uint32 force = (ERTS_CHK_RUNQ_FLG_EVACUATE(c_rq->flags, prio) | (c_rq->flags & ERTS_RUNQ_FLG_INACTIVE)); if (force || c_rqi->len > c_rqi->migrate.limit.this) { ErtsRunQueueInfo *n_rqi; /* We still want to emigrate */ if (n_rq != c_rqi->migrate.runq) { /* Ahh... run queue changed; need to do it all over again... */ erts_smp_runq_unlock(n_rq); continue; } else { if (prio == ERTS_PORT_PRIO_LEVEL) n_rqi = &n_rq->ports.info; else n_rqi = &n_rq->procs.prio_info[prio]; if (force || (n_rqi->len < c_rqi->migrate.limit.other)) { /* emigrate ... */ return n_rq; } } } } ASSERT(n_rq != c_rq); erts_smp_runq_unlock(n_rq); if (!(c_rq->flags & ERTS_RUNQ_FLG_INACTIVE)) { /* No more emigrations to this runq */ ERTS_UNSET_RUNQ_FLG_EMIGRATE(c_rq->flags, prio); ERTS_DBG_SET_INVALID_RUNQP(c_rqi->migrate.runq, 0x3); } return NULL; } } static void immigrate(ErtsRunQueue *rq) { int prio; ASSERT(rq->flags & ERTS_RUNQ_FLGS_IMMIGRATE_QMASK); for (prio = 0; prio < ERTS_NO_PRIO_LEVELS; prio++) { if (ERTS_CHK_RUNQ_FLG_IMMIGRATE(rq->flags, prio)) { ErtsRunQueueInfo *rqi = (prio == ERTS_PORT_PRIO_LEVEL ? &rq->ports.info : &rq->procs.prio_info[prio]); ErtsRunQueue *from_rq = rqi->migrate.runq; int rq_locked, from_rq_locked; ERTS_DBG_VERIFY_VALID_RUNQP(from_rq); rq_locked = 1; from_rq_locked = 1; erts_smp_xrunq_lock(rq, from_rq); /* * erts_smp_xrunq_lock() may release lock on rq! We have * to check that we still want to immigrate from the same * run queue as before. */ if (ERTS_CHK_RUNQ_FLG_IMMIGRATE(rq->flags, prio) && from_rq == rqi->migrate.runq) { ErtsRunQueueInfo *from_rqi = (prio == ERTS_PORT_PRIO_LEVEL ? &from_rq->ports.info : &from_rq->procs.prio_info[prio]); if ((ERTS_CHK_RUNQ_FLG_EVACUATE(rq->flags, prio) && ERTS_CHK_RUNQ_FLG_EVACUATE(from_rq->flags, prio) && from_rqi->len) || (from_rqi->len > rqi->migrate.limit.other && rqi->len < rqi->migrate.limit.this)) { if (prio == ERTS_PORT_PRIO_LEVEL) { Port *prt = from_rq->ports.start; if (prt) { int prt_locked = 0; (void) erts_port_migrate(prt, &prt_locked, from_rq, &from_rq_locked, rq, &rq_locked); if (prt_locked) erts_smp_port_unlock(prt); } } else { Process *proc; ErtsRunPrioQueue *from_rpq; from_rpq = (prio == PRIORITY_LOW ? &from_rq->procs.prio[PRIORITY_NORMAL] : &from_rq->procs.prio[prio]); for (proc = from_rpq->first; proc; proc = proc->next) if (proc->prio == prio && !proc->bound_runq) break; if (proc) { ErtsProcLocks proc_locks = 0; (void) erts_proc_migrate(proc, &proc_locks, from_rq, &from_rq_locked, rq, &rq_locked); if (proc_locks) erts_smp_proc_unlock(proc, proc_locks); } } } else { ERTS_UNSET_RUNQ_FLG_IMMIGRATE(rq->flags, prio); ERTS_DBG_SET_INVALID_RUNQP(rqi->migrate.runq, 0x1); } } if (from_rq_locked) erts_smp_runq_unlock(from_rq); if (!rq_locked) erts_smp_runq_lock(rq); } } } static void evacuate_run_queue(ErtsRunQueue *evac_rq, ErtsRunQueue *rq) { Port *prt; int notify_to_rq = 0; int prio; int prt_locked = 0; int rq_locked = 0; int evac_rq_locked = 1; ErtsMigrateResult mres; erts_smp_runq_lock(evac_rq); erts_smp_atomic32_bor(&evac_rq->scheduler->ssi->flags, ERTS_SSI_FLG_SUSPENDED); evac_rq->flags &= ~ERTS_RUNQ_FLGS_IMMIGRATE_QMASK; evac_rq->flags |= (ERTS_RUNQ_FLGS_EMIGRATE_QMASK | ERTS_RUNQ_FLGS_EVACUATE_QMASK | ERTS_RUNQ_FLG_SUSPENDED); erts_smp_atomic32_bor(&evac_rq->info_flags, ERTS_RUNQ_IFLG_SUSPENDED); /* * Need to set up evacuation paths first since we * may release the run queue lock on evac_rq * when evacuating. */ evac_rq->misc.evac_runq = rq; evac_rq->ports.info.migrate.runq = rq; for (prio = 0; prio < ERTS_NO_PROC_PRIO_LEVELS; prio++) evac_rq->procs.prio_info[prio].migrate.runq = rq; /* Evacuate scheduled misc ops */ if (evac_rq->misc.start) { rq_locked = 1; erts_smp_xrunq_lock(evac_rq, rq); if (rq->misc.end) rq->misc.end->next = evac_rq->misc.start; else rq->misc.start = evac_rq->misc.start; rq->misc.end = evac_rq->misc.end; evac_rq->misc.start = NULL; evac_rq->misc.end = NULL; } /* Evacuate scheduled ports */ prt = evac_rq->ports.start; while (prt) { mres = erts_port_migrate(prt, &prt_locked, evac_rq, &evac_rq_locked, rq, &rq_locked); if (mres == ERTS_MIGRATE_SUCCESS) notify_to_rq = 1; if (prt_locked) erts_smp_port_unlock(prt); if (!evac_rq_locked) { evac_rq_locked = 1; erts_smp_runq_lock(evac_rq); } prt = evac_rq->ports.start; } /* Evacuate scheduled processes */ for (prio = 0; prio < ERTS_NO_PROC_PRIO_LEVELS; prio++) { Process *proc; switch (prio) { case PRIORITY_MAX: case PRIORITY_HIGH: case PRIORITY_NORMAL: proc = evac_rq->procs.prio[prio].first; while (proc) { ErtsProcLocks proc_locks = 0; /* Bound processes are stuck... */ while (proc->bound_runq) { proc = proc->next; if (!proc) goto end_of_proc; } mres = erts_proc_migrate(proc, &proc_locks, evac_rq, &evac_rq_locked, rq, &rq_locked); if (mres == ERTS_MIGRATE_SUCCESS) notify_to_rq = 1; if (proc_locks) erts_smp_proc_unlock(proc, proc_locks); if (!evac_rq_locked) { erts_smp_runq_lock(evac_rq); evac_rq_locked = 1; } proc = evac_rq->procs.prio[prio].first; } end_of_proc: #ifdef DEBUG for (proc = evac_rq->procs.prio[prio].first; proc; proc = proc->next) { ASSERT(proc->bound_runq); } #endif break; case PRIORITY_LOW: break; default: ASSERT(!"Invalid process priority"); break; } } if (rq_locked) erts_smp_runq_unlock(rq); if (evac_rq_locked) erts_smp_runq_unlock(evac_rq); if (notify_to_rq) smp_notify_inc_runq(rq); wake_scheduler(evac_rq, 0, 1); } static int try_steal_task_from_victim(ErtsRunQueue *rq, int *rq_lockedp, ErtsRunQueue *vrq) { Process *proc; int vrq_locked; if (*rq_lockedp) erts_smp_xrunq_lock(rq, vrq); else erts_smp_runq_lock(vrq); vrq_locked = 1; ERTS_SMP_LC_CHK_RUNQ_LOCK(rq, *rq_lockedp); ERTS_SMP_LC_CHK_RUNQ_LOCK(vrq, vrq_locked); /* * Check for a runnable process to steal... */ switch (vrq->flags & ERTS_RUNQ_FLGS_PROCS_QMASK) { case MAX_BIT: case MAX_BIT|HIGH_BIT: case MAX_BIT|NORMAL_BIT: case MAX_BIT|LOW_BIT: case MAX_BIT|HIGH_BIT|NORMAL_BIT: case MAX_BIT|HIGH_BIT|LOW_BIT: case MAX_BIT|NORMAL_BIT|LOW_BIT: case MAX_BIT|HIGH_BIT|NORMAL_BIT|LOW_BIT: for (proc = vrq->procs.prio[PRIORITY_MAX].last; proc; proc = proc->prev) { if (!proc->bound_runq) break; } if (proc) break; case HIGH_BIT: case HIGH_BIT|NORMAL_BIT: case HIGH_BIT|LOW_BIT: case HIGH_BIT|NORMAL_BIT|LOW_BIT: for (proc = vrq->procs.prio[PRIORITY_HIGH].last; proc; proc = proc->prev) { if (!proc->bound_runq) break; } if (proc) break; case NORMAL_BIT: case LOW_BIT: case NORMAL_BIT|LOW_BIT: for (proc = vrq->procs.prio[PRIORITY_NORMAL].last; proc; proc = proc->prev) { if (!proc->bound_runq) break; } if (proc) break; case 0: proc = NULL; break; default: ASSERT(!"Invalid queue mask"); proc = NULL; break; } if (proc) { ErtsProcLocks proc_locks = 0; int res; ErtsMigrateResult mres; mres = erts_proc_migrate(proc, &proc_locks, vrq, &vrq_locked, rq, rq_lockedp); if (proc_locks) erts_smp_proc_unlock(proc, proc_locks); res = !0; switch (mres) { case ERTS_MIGRATE_FAILED_RUNQ_SUSPENDED: res = 0; case ERTS_MIGRATE_SUCCESS: if (vrq_locked) erts_smp_runq_unlock(vrq); return res; default: /* Other failures */ break; } } ERTS_SMP_LC_CHK_RUNQ_LOCK(rq, *rq_lockedp); ERTS_SMP_LC_CHK_RUNQ_LOCK(vrq, vrq_locked); if (!vrq_locked) { if (*rq_lockedp) erts_smp_xrunq_lock(rq, vrq); else erts_smp_runq_lock(vrq); vrq_locked = 1; } ERTS_SMP_LC_CHK_RUNQ_LOCK(rq, *rq_lockedp); ERTS_SMP_LC_CHK_RUNQ_LOCK(vrq, vrq_locked); /* * Check for a runnable port to steal... */ if (vrq->ports.info.len) { Port *prt = vrq->ports.end; int prt_locked = 0; int res; ErtsMigrateResult mres; mres = erts_port_migrate(prt, &prt_locked, vrq, &vrq_locked, rq, rq_lockedp); if (prt_locked) erts_smp_port_unlock(prt); res = !0; switch (mres) { case ERTS_MIGRATE_FAILED_RUNQ_SUSPENDED: res = 0; case ERTS_MIGRATE_SUCCESS: if (vrq_locked) erts_smp_runq_unlock(vrq); return res; default: /* Other failures */ break; } } if (vrq_locked) erts_smp_runq_unlock(vrq); return 0; } static ERTS_INLINE int check_possible_steal_victim(ErtsRunQueue *rq, int *rq_lockedp, int vix) { ErtsRunQueue *vrq = ERTS_RUNQ_IX(vix); erts_aint32_t iflgs = erts_smp_atomic32_read(&vrq->info_flags); if (iflgs & ERTS_RUNQ_IFLG_NONEMPTY) return try_steal_task_from_victim(rq, rq_lockedp, vrq); else return 0; } static int try_steal_task(ErtsRunQueue *rq) { int res, rq_locked, vix, active_rqs, blnc_rqs; if (erts_common_run_queue) return 0; /* * We are not allowed to steal jobs to this run queue * if it is suspended. Note that it might get suspended * at any time when we don't have the lock on the run * queue. */ if (rq->flags & ERTS_RUNQ_FLG_SUSPENDED) return 0; res = 0; rq_locked = 1; ERTS_SMP_LC_CHK_RUNQ_LOCK(rq, rq_locked); get_no_runqs(&active_rqs, &blnc_rqs); if (active_rqs > blnc_rqs) active_rqs = blnc_rqs; if (rq->ix < active_rqs) { /* First try to steal from an inactive run queue... */ if (active_rqs < blnc_rqs) { int no = blnc_rqs - active_rqs; int stop_ix = vix = active_rqs + rq->ix % no; while (erts_smp_atomic32_read_acqb(&no_empty_run_queues) < blnc_rqs) { res = check_possible_steal_victim(rq, &rq_locked, vix); if (res) goto done; vix++; if (vix >= blnc_rqs) vix = active_rqs; if (vix == stop_ix) break; } } vix = rq->ix; /* ... then try to steal a job from another active queue... */ while (erts_smp_atomic32_read_acqb(&no_empty_run_queues) < blnc_rqs) { vix++; if (vix >= active_rqs) vix = 0; if (vix == rq->ix) break; res = check_possible_steal_victim(rq, &rq_locked, vix); if (res) goto done; } } done: if (!rq_locked) erts_smp_runq_lock(rq); if (!res) res = !ERTS_EMPTY_RUNQ(rq); return res; } /* Run queue balancing */ typedef struct { Uint32 flags; struct { int max_len; int avail; int reds; int migration_limit; int emigrate_to; int immigrate_from; } prio[ERTS_NO_PRIO_LEVELS]; int reds; int full_reds; int full_reds_history_sum; int full_reds_history_change; int oowc; int max_len; } ErtsRunQueueBalance; static ErtsRunQueueBalance *run_queue_info; typedef struct { int qix; int len; } ErtsRunQueueCompare; static ErtsRunQueueCompare *run_queue_compare; static int rqc_len_cmp(const void *x, const void *y) { return ((ErtsRunQueueCompare *) x)->len - ((ErtsRunQueueCompare *) y)->len; } #define ERTS_PERCENT(X, Y) \ ((Y) == 0 \ ? ((X) == 0 ? 100 : INT_MAX) \ : ((100*(X))/(Y))) #define ERTS_UPDATE_FULL_REDS(QIX, LAST_REDS) \ do { \ run_queue_info[(QIX)].full_reds \ = run_queue_info[(QIX)].full_reds_history_sum; \ run_queue_info[(QIX)].full_reds += (LAST_REDS); \ run_queue_info[(QIX)].full_reds \ >>= ERTS_FULL_REDS_HISTORY_AVG_SHFT; \ run_queue_info[(QIX)].full_reds_history_sum \ -= run_queue_info[(QIX)].full_reds_history_change; \ run_queue_info[(QIX)].full_reds_history_sum += (LAST_REDS); \ run_queue_info[(QIX)].full_reds_history_change = (LAST_REDS); \ } while (0) #define ERTS_DBG_CHK_FULL_REDS_HISTORY(RQ) \ do { \ int sum__ = 0; \ int rix__; \ for (rix__ = 0; rix__ < ERTS_FULL_REDS_HISTORY_SIZE; rix__++) \ sum__ += (RQ)->full_reds_history[rix__]; \ ASSERT(sum__ == (RQ)->full_reds_history_sum); \ } while (0); static void check_balance(ErtsRunQueue *c_rq) { #if ERTS_MAX_PROCESSES >= (1 << 27) # error check_balance() assumes ERTS_MAX_PROCESS < (1 << 27) #endif ErtsRunQueueBalance avg = {0}; Sint64 scheds_reds, full_scheds_reds; int forced, active, current_active, oowc, half_full_scheds, full_scheds, mmax_len, blnc_no_rqs, qix, pix, freds_hist_ix; if (erts_smp_atomic32_xchg(&balance_info.checking_balance, 1)) { c_rq->check_balance_reds = INT_MAX; return; } get_no_runqs(NULL, &blnc_no_rqs); if (blnc_no_rqs == 1) { c_rq->check_balance_reds = INT_MAX; erts_smp_atomic32_set(&balance_info.checking_balance, 0); return; } erts_smp_runq_unlock(c_rq); if (balance_info.halftime) { balance_info.halftime = 0; erts_smp_atomic32_set(&balance_info.checking_balance, 0); ERTS_FOREACH_RUNQ(rq, { if (rq->waiting) rq->flags |= ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK; else rq->flags &= ~ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK; rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; }); erts_smp_runq_lock(c_rq); return; } /* * check_balance() is never called in more threads * than one at a time, i.e., we will normally never * get any conflicts on the balance_info.update_mtx. * However, when blocking multi scheduling (which performance * critical applications do *not* do) migration information * is manipulated. Such updates of the migration information * might clash with balancing. */ erts_smp_mtx_lock(&balance_info.update_mtx); forced = balance_info.forced_check_balance; balance_info.forced_check_balance = 0; get_no_runqs(¤t_active, &blnc_no_rqs); if (blnc_no_rqs == 1) { erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_runq_lock(c_rq); c_rq->check_balance_reds = INT_MAX; erts_smp_atomic32_set(&balance_info.checking_balance, 0); return; } freds_hist_ix = balance_info.full_reds_history_index; balance_info.full_reds_history_index++; if (balance_info.full_reds_history_index >= ERTS_FULL_REDS_HISTORY_SIZE) balance_info.full_reds_history_index = 0; /* Read balance information for all run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(qix); erts_smp_runq_lock(rq); run_queue_info[qix].flags = rq->flags; for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].max_len = rq->procs.prio_info[pix].max_len; run_queue_info[qix].prio[pix].reds = rq->procs.prio_info[pix].reds; } run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].max_len = rq->ports.info.max_len; run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].reds = rq->ports.info.reds; run_queue_info[qix].full_reds_history_sum = rq->full_reds_history_sum; run_queue_info[qix].full_reds_history_change = rq->full_reds_history[freds_hist_ix]; run_queue_info[qix].oowc = rq->out_of_work_count; run_queue_info[qix].max_len = rq->max_len; rq->check_balance_reds = INT_MAX; erts_smp_runq_unlock(rq); } full_scheds = 0; half_full_scheds = 0; full_scheds_reds = 0; scheds_reds = 0; oowc = 0; mmax_len = 0; /* Calculate availability for each priority in each run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { int treds = 0; if (run_queue_info[qix].flags & ERTS_RUNQ_FLG_OUT_OF_WORK) { for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].avail = 100; treds += run_queue_info[qix].prio[pix].reds; } if (!(run_queue_info[qix].flags & ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)) half_full_scheds++; ERTS_UPDATE_FULL_REDS(qix, ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED); } else { ASSERT(!(run_queue_info[qix].flags & ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)); for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) treds += run_queue_info[qix].prio[pix].reds; if (treds == 0) { for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) run_queue_info[qix].prio[pix].avail = 0; } else { Sint64 xreds = 0; Sint64 procreds = treds; procreds -= ((Sint64) run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].reds); for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { Sint64 av; if (xreds == 0) av = 100; else if (procreds == xreds) av = 0; else { av = (100*(procreds - xreds)) / procreds; if (av == 0) av = 1; } run_queue_info[qix].prio[pix].avail = (int) av; ASSERT(run_queue_info[qix].prio[pix].avail >= 0); if (pix < PRIORITY_NORMAL) /* ie., max or high */ xreds += (Sint64) run_queue_info[qix].prio[pix].reds; } run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].avail = 100; } ERTS_UPDATE_FULL_REDS(qix, treds); full_scheds_reds += run_queue_info[qix].full_reds; full_scheds++; half_full_scheds++; } run_queue_info[qix].reds = treds; scheds_reds += treds; oowc += run_queue_info[qix].oowc; if (mmax_len < run_queue_info[qix].max_len) mmax_len = run_queue_info[qix].max_len; } if (!forced && half_full_scheds != blnc_no_rqs) { int min = 1; if (min < half_full_scheds) min = half_full_scheds; if (full_scheds) { active = (scheds_reds - 1)/ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED+1; } else { active = balance_info.last_active_runqs - 1; } if (balance_info.last_active_runqs < current_active) { ERTS_BLNCE_SAVE_RISE(current_active, mmax_len, scheds_reds); active = current_active; } else if (active < balance_info.prev_rise.active_runqs) { if (ERTS_PERCENT(mmax_len, balance_info.prev_rise.max_len) >= 90 && ERTS_PERCENT(scheds_reds, balance_info.prev_rise.reds) >= 90) { active = balance_info.prev_rise.active_runqs; } } if (active < min) active = min; else if (active > blnc_no_rqs) active = blnc_no_rqs; if (active == blnc_no_rqs) goto all_active; for (qix = 0; qix < active; qix++) { run_queue_info[qix].flags = 0; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].emigrate_to = -1; run_queue_info[qix].prio[pix].immigrate_from = -1; run_queue_info[qix].prio[pix].migration_limit = 0; } } for (qix = active; qix < blnc_no_rqs; qix++) { run_queue_info[qix].flags = ERTS_RUNQ_FLG_INACTIVE; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int tix = qix % active; ERTS_SET_RUNQ_FLG_EMIGRATE(run_queue_info[qix].flags, pix); run_queue_info[qix].prio[pix].emigrate_to = tix; run_queue_info[qix].prio[pix].immigrate_from = -1; run_queue_info[qix].prio[pix].migration_limit = 0; } } } else { if (balance_info.last_active_runqs < current_active) ERTS_BLNCE_SAVE_RISE(current_active, mmax_len, scheds_reds); all_active: active = blnc_no_rqs; for (qix = 0; qix < blnc_no_rqs; qix++) { if (full_scheds_reds > 0) { /* Calculate availability compared to other schedulers */ if (!(run_queue_info[qix].flags & ERTS_RUNQ_FLG_OUT_OF_WORK)) { Sint64 tmp = ((Sint64) run_queue_info[qix].full_reds * (Sint64) full_scheds); for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { Sint64 avail = run_queue_info[qix].prio[pix].avail; avail = (avail*tmp)/full_scheds_reds; ASSERT(avail >= 0); run_queue_info[qix].prio[pix].avail = (int) avail; } } } /* Calculate average max length */ for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].emigrate_to = -1; run_queue_info[qix].prio[pix].immigrate_from = -1; avg.prio[pix].max_len += run_queue_info[qix].prio[pix].max_len; avg.prio[pix].avail += run_queue_info[qix].prio[pix].avail; } } for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int max_len = avg.prio[pix].max_len; if (max_len != 0) { int avail = avg.prio[pix].avail; if (avail != 0) { max_len = (int) ((100*((Sint64) max_len) - 1) / ((Sint64) avail)) + 1; avg.prio[pix].max_len = max_len; ASSERT(max_len >= 0); } } } /* Calculate migration limits for all priority queues in all run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { run_queue_info[qix].flags = 0; /* Reset for later use... */ for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int limit; if (avg.prio[pix].max_len == 0 || run_queue_info[qix].prio[pix].avail == 0) limit = 0; else limit = (int) (((((Sint64) avg.prio[pix].max_len) * ((Sint64) run_queue_info[qix].prio[pix].avail)) - 1) / 100 + 1); run_queue_info[qix].prio[pix].migration_limit = limit; } } /* Setup migration paths for all priorities */ for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int low = 0, high = 0; for (qix = 0; qix < blnc_no_rqs; qix++) { int len_diff = run_queue_info[qix].prio[pix].max_len; len_diff -= run_queue_info[qix].prio[pix].migration_limit; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d ", len_diff); #endif run_queue_compare[qix].qix = qix; run_queue_compare[qix].len = len_diff; if (len_diff != 0) { if (len_diff < 0) low++; else high++; } } #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "\n"); #endif if (low && high) { int from_qix; int to_qix; int eof = 0; int eot = 0; int tix = 0; int fix = blnc_no_rqs-1; qsort(run_queue_compare, blnc_no_rqs, sizeof(ErtsRunQueueCompare), rqc_len_cmp); while (1) { if (run_queue_compare[fix].len <= 0) eof = 1; if (run_queue_compare[tix].len >= 0) eot = 1; if (eof || eot) break; from_qix = run_queue_compare[fix].qix; to_qix = run_queue_compare[tix].qix; if (run_queue_info[from_qix].prio[pix].avail == 0) { ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[from_qix].flags, pix); ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[to_qix].flags, pix); } ERTS_SET_RUNQ_FLG_EMIGRATE(run_queue_info[from_qix].flags, pix); ERTS_SET_RUNQ_FLG_IMMIGRATE(run_queue_info[to_qix].flags, pix); run_queue_info[from_qix].prio[pix].emigrate_to = to_qix; run_queue_info[to_qix].prio[pix].immigrate_from = from_qix; tix++; fix--; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d >--> %d\n", from_qix, to_qix); #endif } if (!eot && eof) { if (fix < blnc_no_rqs-1) fix++; if (run_queue_compare[fix].len > 0) { int fix2 = -1; while (tix < fix) { if (run_queue_compare[tix].len >= 0) break; if (fix2 < fix) fix2 = blnc_no_rqs-1; from_qix = run_queue_compare[fix2].qix; to_qix = run_queue_compare[tix].qix; ASSERT(to_qix != from_qix); if (run_queue_info[from_qix].prio[pix].avail == 0) ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[to_qix].flags, pix); ERTS_SET_RUNQ_FLG_IMMIGRATE(run_queue_info[to_qix].flags, pix); run_queue_info[to_qix].prio[pix].immigrate_from = from_qix; tix++; fix2--; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d --> %d\n", from_qix, to_qix); #endif } } } else if (!eof && eot) { if (tix > 0) tix--; if (run_queue_compare[tix].len < 0) { int tix2 = 0; while (tix < fix) { if (run_queue_compare[fix].len <= 0) break; if (tix2 > tix) tix2 = 0; from_qix = run_queue_compare[fix].qix; to_qix = run_queue_compare[tix2].qix; ASSERT(to_qix != from_qix); if (run_queue_info[from_qix].prio[pix].avail == 0) ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[from_qix].flags, pix); ERTS_SET_RUNQ_FLG_EMIGRATE(run_queue_info[from_qix].flags, pix); run_queue_info[from_qix].prio[pix].emigrate_to = to_qix; fix--; tix2++; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d >-- %d\n", from_qix, to_qix); #endif } } } } } #ifdef DBG_PRINT erts_fprintf(stderr, "--------------------------------\n"); #endif } balance_info.last_active_runqs = active; set_no_active_runqs(active); balance_info.halftime = 1; erts_smp_atomic32_set(&balance_info.checking_balance, 0); /* Write migration paths and reset balance statistics in all queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { int mqix; Uint32 flags; ErtsRunQueue *rq = ERTS_RUNQ_IX(qix); ErtsRunQueueInfo *rqi; flags = run_queue_info[qix].flags; erts_smp_runq_lock(rq); flags |= (rq->flags & ~ERTS_RUNQ_FLGS_MIGRATION_INFO); ASSERT(!(flags & ERTS_RUNQ_FLG_OUT_OF_WORK)); if (rq->waiting) flags |= ERTS_RUNQ_FLG_OUT_OF_WORK; rq->full_reds_history_sum = run_queue_info[qix].full_reds_history_sum; rq->full_reds_history[freds_hist_ix] = run_queue_info[qix].full_reds_history_change; ERTS_DBG_CHK_FULL_REDS_HISTORY(rq); rq->out_of_work_count = 0; rq->flags = flags; rq->max_len = rq->len; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { rqi = (pix == ERTS_PORT_PRIO_LEVEL ? &rq->ports.info : &rq->procs.prio_info[pix]); rqi->max_len = rqi->len; rqi->reds = 0; if (!(ERTS_CHK_RUNQ_FLG_EMIGRATE(flags, pix) | ERTS_CHK_RUNQ_FLG_IMMIGRATE(flags, pix))) { ASSERT(run_queue_info[qix].prio[pix].immigrate_from < 0); ASSERT(run_queue_info[qix].prio[pix].emigrate_to < 0); #ifdef DEBUG rqi->migrate.limit.this = -1; rqi->migrate.limit.other = -1; ERTS_DBG_SET_INVALID_RUNQP(rqi->migrate.runq, 0x2); #endif } else if (ERTS_CHK_RUNQ_FLG_EMIGRATE(flags, pix)) { ASSERT(!ERTS_CHK_RUNQ_FLG_IMMIGRATE(flags, pix)); ASSERT(run_queue_info[qix].prio[pix].immigrate_from < 0); ASSERT(run_queue_info[qix].prio[pix].emigrate_to >= 0); mqix = run_queue_info[qix].prio[pix].emigrate_to; rqi->migrate.limit.this = run_queue_info[qix].prio[pix].migration_limit; rqi->migrate.limit.other = run_queue_info[mqix].prio[pix].migration_limit; rqi->migrate.runq = ERTS_RUNQ_IX(mqix); } else { ASSERT(ERTS_CHK_RUNQ_FLG_IMMIGRATE(flags, pix)); ASSERT(run_queue_info[qix].prio[pix].emigrate_to < 0); ASSERT(run_queue_info[qix].prio[pix].immigrate_from >= 0); mqix = run_queue_info[qix].prio[pix].immigrate_from; rqi->migrate.limit.this = run_queue_info[qix].prio[pix].migration_limit; rqi->migrate.limit.other = run_queue_info[mqix].prio[pix].migration_limit; rqi->migrate.runq = ERTS_RUNQ_IX(mqix); } } rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; erts_smp_runq_unlock(rq); } balance_info.n++; erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_runq_lock(c_rq); } #endif /* #ifdef ERTS_SMP */ Uint erts_debug_nbalance(void) { #ifdef ERTS_SMP Uint n; erts_smp_mtx_lock(&balance_info.update_mtx); n = balance_info.n; erts_smp_mtx_unlock(&balance_info.update_mtx); return n; #else return 0; #endif } void erts_early_init_scheduling(void) { wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM; } int erts_sched_set_wakeup_limit(char *str) { if (sys_strcmp(str, "very_high") == 0) wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH; else if (sys_strcmp(str, "high") == 0) wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_HIGH; else if (sys_strcmp(str, "medium") == 0) wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM; else if (sys_strcmp(str, "low") == 0) wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_LOW; else if (sys_strcmp(str, "very_low") == 0) wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW; else return EINVAL; return 0; } void erts_init_scheduling(int mrq, int no_schedulers, int no_schedulers_online) { int ix, n; #ifndef ERTS_SMP mrq = 0; #endif init_misc_op_list_alloc(); ASSERT(no_schedulers_online <= no_schedulers); ASSERT(no_schedulers_online >= 1); ASSERT(no_schedulers >= 1); /* Create and initialize run queues */ n = (int) (mrq ? no_schedulers : 1); erts_aligned_run_queues = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_RUNQS, sizeof(ErtsAlignedRunQueue) * n); #ifdef ERTS_SMP erts_smp_atomic32_init(&no_empty_run_queues, 0); #endif erts_no_run_queues = n; for (ix = 0; ix < n; ix++) { int pix, rix; ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); rq->ix = ix; erts_smp_atomic32_init(&rq->info_flags, ERTS_RUNQ_IFLG_NONEMPTY); /* make sure that the "extra" id correponds to the schedulers * id if the esdp->no <-> ix+1 mapping change. */ erts_smp_mtx_init_x(&rq->mtx, "run_queue", make_small(ix + 1)); erts_smp_cnd_init(&rq->cnd); #ifdef ERTS_SMP erts_smp_spinlock_init(&rq->sleepers.lock, "run_queue_sleep_list"); rq->sleepers.list = NULL; #endif rq->waiting = 0; rq->woken = 0; rq->flags = !mrq ? ERTS_RUNQ_FLG_SHARED_RUNQ : 0; rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; rq->full_reds_history_sum = 0; for (rix = 0; rix < ERTS_FULL_REDS_HISTORY_SIZE; rix++) { rq->full_reds_history_sum += ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED; rq->full_reds_history[rix] = ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED; } rq->out_of_work_count = 0; rq->max_len = 0; rq->len = 0; rq->wakeup_other = 0; rq->wakeup_other_reds = 0; rq->procs.len = 0; rq->procs.pending_exiters = NULL; rq->procs.context_switches = 0; rq->procs.reductions = 0; for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { rq->procs.prio_info[pix].len = 0; rq->procs.prio_info[pix].max_len = 0; rq->procs.prio_info[pix].reds = 0; rq->procs.prio_info[pix].migrate.limit.this = 0; rq->procs.prio_info[pix].migrate.limit.other = 0; ERTS_DBG_SET_INVALID_RUNQP(rq->procs.prio_info[pix].migrate.runq, 0x0); if (pix < ERTS_NO_PROC_PRIO_LEVELS - 1) { rq->procs.prio[pix].first = NULL; rq->procs.prio[pix].last = NULL; } } rq->misc.start = NULL; rq->misc.end = NULL; rq->misc.evac_runq = NULL; rq->ports.info.len = 0; rq->ports.info.max_len = 0; rq->ports.info.reds = 0; rq->ports.info.migrate.limit.this = 0; rq->ports.info.migrate.limit.other = 0; rq->ports.info.migrate.runq = NULL; rq->ports.start = NULL; rq->ports.end = NULL; } erts_common_run_queue = !mrq ? ERTS_RUNQ_IX(0) : NULL; #ifdef ERTS_SMP if (erts_no_run_queues != 1) { run_queue_info = erts_alloc(ERTS_ALC_T_RUNQ_BLNS, (sizeof(ErtsRunQueueBalance) * erts_no_run_queues)); run_queue_compare = erts_alloc(ERTS_ALC_T_RUNQ_BLNS, (sizeof(ErtsRunQueueCompare) * erts_no_run_queues)); } #endif n = (int) no_schedulers; erts_no_schedulers = n; #ifdef ERTS_SMP /* Create and initialize scheduler sleep info */ aligned_sched_sleep_info = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_SCHDLR_SLP_INFO, n * sizeof(ErtsAlignedSchedulerSleepInfo)); for (ix = 0; ix < n; ix++) { ErtsSchedulerSleepInfo *ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); #if 0 /* no need to initialize these... */ ssi->next = NULL; ssi->prev = NULL; #endif erts_smp_atomic32_init(&ssi->flags, 0); ssi->event = NULL; /* initialized in sched_thread_func */ erts_smp_atomic32_init(&ssi->aux_work, 0); } #endif /* Create and initialize scheduler specific data */ erts_aligned_scheduler_data = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_SCHDLR_DATA, n*sizeof(ErtsAlignedSchedulerData)); for (ix = 0; ix < n; ix++) { ErtsSchedulerData *esdp = ERTS_SCHEDULER_IX(ix); #ifdef ERTS_SMP erts_bits_init_state(&esdp->erl_bits_state); esdp->match_pseudo_process = NULL; esdp->ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); esdp->free_process = NULL; #if HALFWORD_HEAP /* Registers need to be heap allocated (correct memory range) for tracing to work */ esdp->save_reg = erts_alloc(ERTS_ALC_T_BEAM_REGISTER, ERTS_X_REGS_ALLOCATED * sizeof(Eterm)); #endif #endif #if !HEAP_ON_C_STACK esdp->num_tmp_heap_used = 0; #endif esdp->no = (Uint) ix+1; esdp->current_process = NULL; esdp->current_port = NULL; esdp->virtual_reds = 0; esdp->cpu_id = -1; erts_init_atom_cache_map(&esdp->atom_cache_map); if (erts_common_run_queue) { esdp->run_queue = erts_common_run_queue; esdp->run_queue->scheduler = NULL; } else { esdp->run_queue = ERTS_RUNQ_IX(ix); esdp->run_queue->scheduler = esdp; } #ifdef ERTS_SMP erts_smp_atomic32_init(&esdp->chk_cpu_bind, 0); #endif } #ifdef ERTS_SMP erts_smp_mtx_init(&schdlr_sspnd.mtx, "schdlr_sspnd"); erts_smp_cnd_init(&schdlr_sspnd.cnd); erts_smp_atomic32_init(&schdlr_sspnd.changing, 0); schdlr_sspnd.online = no_schedulers_online; schdlr_sspnd.curr_online = no_schedulers; erts_smp_atomic32_init(&schdlr_sspnd.msb.ongoing, 0); erts_smp_atomic32_init(&schdlr_sspnd.active, no_schedulers); schdlr_sspnd.msb.procs = NULL; init_no_runqs(no_schedulers, erts_common_run_queue ? 1 : no_schedulers_online); balance_info.last_active_runqs = no_schedulers; erts_smp_mtx_init(&balance_info.update_mtx, "migration_info_update"); balance_info.forced_check_balance = 0; balance_info.halftime = 1; balance_info.full_reds_history_index = 0; erts_smp_atomic32_init(&balance_info.checking_balance, 0); balance_info.prev_rise.active_runqs = 0; balance_info.prev_rise.max_len = 0; balance_info.prev_rise.reds = 0; balance_info.n = 0; if (no_schedulers_online < no_schedulers) { if (erts_common_run_queue) { for (ix = no_schedulers_online; ix < no_schedulers; ix++) erts_smp_atomic32_bor(&ERTS_SCHED_SLEEP_INFO_IX(ix)->flags, ERTS_SSI_FLG_SUSPENDED); } else { for (ix = no_schedulers_online; ix < erts_no_run_queues; ix++) evacuate_run_queue(ERTS_RUNQ_IX(ix), ERTS_RUNQ_IX(ix % no_schedulers_online)); } } schdlr_sspnd.wait_curr_online = no_schedulers_online; schdlr_sspnd.curr_online *= 2; /* Boot strapping... */ ERTS_SCHDLR_SSPND_CHNG_SET((ERTS_SCHDLR_SSPND_CHNG_ONLN | ERTS_SCHDLR_SSPND_CHNG_WAITER), 0); erts_smp_atomic32_init(&doing_sys_schedule, 0); init_misc_aux_work(); #else /* !ERTS_SMP */ { ErtsSchedulerData *esdp; esdp = ERTS_SCHEDULER_IX(0); erts_scheduler_data = esdp; #ifdef USE_THREADS erts_tsd_set(sched_data_key, (void *) esdp); #endif } erts_no_schedulers = 1; #endif erts_smp_atomic32_init(&function_calls, 0); /* init port tasks */ erts_port_task_init(); #ifndef ERTS_SMP #ifdef ERTS_DO_VERIFY_UNUSED_TEMP_ALLOC erts_scheduler_data->verify_unused_temp_alloc = erts_alloc_get_verify_unused_temp_alloc( &erts_scheduler_data->verify_unused_temp_alloc_data); ERTS_VERIFY_UNUSED_TEMP_ALLOC(NULL); #endif #endif } ErtsRunQueue * erts_schedid2runq(Uint id) { int ix; if (erts_common_run_queue) return erts_common_run_queue; ix = (int) id - 1; ASSERT(0 <= ix && ix < erts_no_run_queues); return ERTS_RUNQ_IX(ix); } #ifdef USE_THREADS ErtsSchedulerData * erts_get_scheduler_data(void) { return (ErtsSchedulerData *) erts_tsd_get(sched_data_key); } #endif static int remove_proc_from_runq(ErtsRunQueue *rq, Process *p, int to_inactive); static ERTS_INLINE void suspend_process(ErtsRunQueue *rq, Process *p) { ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); p->rcount++; /* count number of suspend */ #ifdef ERTS_SMP ASSERT(!(p->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) || p == erts_get_current_process()); ASSERT(p->status != P_RUNNING || p->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING); if (p->status_flags & ERTS_PROC_SFLG_PENDADD2SCHEDQ) goto runable; #endif switch(p->status) { case P_SUSPENDED: break; case P_RUNABLE: #ifdef ERTS_SMP runable: if (!ERTS_PROC_PENDING_EXIT(p)) #endif remove_proc_from_runq(rq, p, 1); /* else: * leave process in schedq so it will discover the pending exit */ p->rstatus = P_RUNABLE; /* wakeup as runnable */ break; case P_RUNNING: p->rstatus = P_RUNABLE; /* wakeup as runnable */ break; case P_WAITING: p->rstatus = P_WAITING; /* wakeup as waiting */ break; case P_EXITING: return; /* ignore this */ case P_GARBING: case P_FREE: erl_exit(1, "bad state in suspend_process()\n"); } if ((erts_system_profile_flags.runnable_procs) && (p->rcount == 1) && (p->status != P_WAITING)) { profile_runnable_proc(p, am_inactive); } p->status = P_SUSPENDED; } static ERTS_INLINE void resume_process(Process *p) { Uint32 *statusp; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); switch (p->status) { case P_SUSPENDED: statusp = &p->status; break; case P_GARBING: if (p->gcstatus == P_SUSPENDED) { statusp = &p->gcstatus; break; } /* Fall through */ default: return; } ASSERT(p->rcount > 0); if (--p->rcount > 0) /* multiple suspend */ return; switch(p->rstatus) { case P_RUNABLE: erts_add_to_runq(p); break; case P_WAITING: *statusp = P_WAITING; break; default: erl_exit(1, "bad state in resume_process()\n"); } p->rstatus = P_FREE; } int erts_get_max_no_executing_schedulers(void) { #ifdef ERTS_SMP if (erts_smp_atomic32_read(&schdlr_sspnd.changing)) return (int) erts_no_schedulers; ERTS_THR_MEMORY_BARRIER; return (int) erts_smp_atomic32_read(&schdlr_sspnd.active); #else return 1; #endif } #ifdef ERTS_SMP static void susp_sched_prep_block(void *unused) { erts_smp_mtx_unlock(&schdlr_sspnd.mtx); } static void susp_sched_resume_block(void *unused) { erts_smp_mtx_lock(&schdlr_sspnd.mtx); } static void scheduler_ix_resume_wake(Uint ix) { ErtsSchedulerSleepInfo *ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); erts_aint32_t xflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_aint32_t oflgs; do { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, 0, xflgs); if (oflgs == xflgs) { erts_sched_finish_poke(ssi, oflgs); break; } xflgs = oflgs; } while (oflgs & ERTS_SSI_FLG_SUSPENDED); } static erts_aint32_t sched_prep_spin_suspended(ErtsSchedulerSleepInfo *ssi, erts_aint32_t xpct) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_aint32_t xflgs = xpct; do { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; xflgs = oflgs; } while (oflgs & ERTS_SSI_FLG_SUSPENDED); return oflgs; } static erts_aint32_t sched_spin_suspended(ErtsSchedulerSleepInfo *ssi, int spincount) { int until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; int sc = spincount; erts_aint32_t flgs; do { flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if ((flgs & (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) != (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { break; } ERTS_SPIN_BODY; if (--until_yield == 0) { until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; erts_thr_yield(); } } while (--sc > 0); return flgs; } static erts_aint32_t sched_set_suspended_sleeptype(ErtsSchedulerSleepInfo *ssi) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_aint32_t xflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_tse_reset(ssi->event); while (1) { oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; if ((oflgs & (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) != (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { return oflgs; } xflgs = oflgs; } } static void suspend_scheduler(ErtsSchedulerData *esdp) { erts_aint32_t flgs; erts_aint32_t changing; long no = (long) esdp->no; ErtsSchedulerSleepInfo *ssi = esdp->ssi; long active_schedulers; int curr_online = 1; int wake = 0; #if defined(ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK) \ || defined(ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK) erts_aint32_t aux_work; #endif /* * Schedulers may be suspended in two different ways: * - A scheduler may be suspended since it is not online. * All schedulers with scheduler ids greater than * schdlr_sspnd.online are suspended. * - Multi scheduling is blocked. All schedulers except the * scheduler with scheduler id 1 are suspended. * * Regardless of why a scheduler is suspended, it ends up here. */ ASSERT(no != 1); erts_smp_runq_unlock(esdp->run_queue); erts_sched_check_cpu_bind_prep_suspend(esdp); if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(esdp->no), am_inactive); erts_smp_mtx_lock(&schdlr_sspnd.mtx); flgs = sched_prep_spin_suspended(ssi, ERTS_SSI_FLG_SUSPENDED); if (flgs & ERTS_SSI_FLG_SUSPENDED) { active_schedulers = erts_smp_atomic32_dectest(&schdlr_sspnd.active); ASSERT(active_schedulers >= 1); changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); if (changing & ERTS_SCHDLR_SSPND_CHNG_MSB) { if (active_schedulers == schdlr_sspnd.msb.wait_active) wake = 1; if (active_schedulers == 1) { changing = erts_smp_atomic32_band(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_MSB); changing &= ~ERTS_SCHDLR_SSPND_CHNG_MSB; } } while (1) { if (changing & ERTS_SCHDLR_SSPND_CHNG_ONLN) { int changed = 0; if (no > schdlr_sspnd.online && curr_online) { schdlr_sspnd.curr_online--; curr_online = 0; changed = 1; } else if (no <= schdlr_sspnd.online && !curr_online) { schdlr_sspnd.curr_online++; curr_online = 1; changed = 1; } if (changed && schdlr_sspnd.curr_online == schdlr_sspnd.wait_curr_online) wake = 1; if (schdlr_sspnd.online == schdlr_sspnd.curr_online) { changing = erts_smp_atomic32_band(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_ONLN); changing &= ~ERTS_SCHDLR_SSPND_CHNG_ONLN; } } if (wake) { erts_smp_cnd_signal(&schdlr_sspnd.cnd); wake = 0; } flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if (!(flgs & ERTS_SSI_FLG_SUSPENDED)) break; erts_smp_mtx_unlock(&schdlr_sspnd.mtx); #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); blockable_aux_work: blockable_aux_work(esdp, ssi, aux_work); #endif erts_smp_activity_begin(ERTS_ACTIVITY_WAIT, NULL, NULL, NULL); while (1) { erts_aint32_t flgs; #ifdef ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK #ifndef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); #endif nonblockable_aux_work(esdp, ssi, aux_work); #endif flgs = sched_spin_suspended(ssi, ERTS_SCHED_SUSPEND_SLEEP_SPINCOUNT); if (flgs == (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { flgs = sched_set_suspended_sleeptype(ssi); if (flgs == (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { int res; do { res = erts_tse_wait(ssi->event); } while (res == EINTR); } } flgs = sched_prep_spin_suspended(ssi, (ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)); if (!(flgs & ERTS_SSI_FLG_SUSPENDED)) break; changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); if (changing & ~ERTS_SCHDLR_SSPND_CHNG_WAITER) break; #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = erts_smp_atomic32_read(&ssi->aux_work); if (aux_work & ERTS_SSI_BLOCKABLE_AUX_WORK_MASK) { erts_smp_activity_end(ERTS_ACTIVITY_WAIT, NULL, NULL, NULL); goto blockable_aux_work; } #endif } erts_smp_activity_end(ERTS_ACTIVITY_WAIT, NULL, NULL, NULL); erts_smp_mtx_lock(&schdlr_sspnd.mtx); changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); } active_schedulers = erts_smp_atomic32_inctest(&schdlr_sspnd.active); changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); if ((changing & ERTS_SCHDLR_SSPND_CHNG_MSB) && schdlr_sspnd.online == active_schedulers) { erts_smp_atomic32_band(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_MSB); } ASSERT(no <= schdlr_sspnd.online); ASSERT(!erts_smp_atomic32_read(&schdlr_sspnd.msb.ongoing)); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); ASSERT(curr_online); if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(esdp->no), am_active); erts_smp_runq_lock(esdp->run_queue); non_empty_runq(esdp->run_queue); erts_sched_check_cpu_bind_post_suspend(esdp); } #define ERTS_RUNQ_RESET_SUSPEND_INFO(RQ, DBG_ID) \ do { \ int pix__; \ (RQ)->misc.evac_runq = NULL; \ (RQ)->ports.info.migrate.runq = NULL; \ (RQ)->flags &= ~(ERTS_RUNQ_FLGS_IMMIGRATE_QMASK \ | ERTS_RUNQ_FLGS_EMIGRATE_QMASK \ | ERTS_RUNQ_FLGS_EVACUATE_QMASK \ | ERTS_RUNQ_FLG_SUSPENDED); \ (RQ)->flags |= (ERTS_RUNQ_FLG_OUT_OF_WORK \ | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK); \ (RQ)->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; \ erts_smp_atomic32_band(&(RQ)->info_flags, ~ERTS_RUNQ_IFLG_SUSPENDED);\ for (pix__ = 0; pix__ < ERTS_NO_PROC_PRIO_LEVELS; pix__++) { \ (RQ)->procs.prio_info[pix__].max_len = 0; \ (RQ)->procs.prio_info[pix__].reds = 0; \ ERTS_DBG_SET_INVALID_RUNQP((RQ)->procs.prio_info[pix__].migrate.runq,\ (DBG_ID)); \ } \ (RQ)->ports.info.max_len = 0; \ (RQ)->ports.info.reds = 0; \ } while (0) #define ERTS_RUNQ_RESET_MIGRATION_PATHS__(RQ) \ do { \ ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked((RQ))); \ (RQ)->misc.evac_runq = NULL; \ (RQ)->ports.info.migrate.runq = NULL; \ (RQ)->flags &= ~(ERTS_RUNQ_FLGS_IMMIGRATE_QMASK \ | ERTS_RUNQ_FLGS_EMIGRATE_QMASK \ | ERTS_RUNQ_FLGS_EVACUATE_QMASK); \ } while (0) #ifdef DEBUG #define ERTS_RUNQ_RESET_MIGRATION_PATHS(RQ, DBG_ID) \ do { \ int pix__; \ ERTS_RUNQ_RESET_MIGRATION_PATHS__((RQ)); \ for (pix__ = 0; pix__ < ERTS_NO_PROC_PRIO_LEVELS; pix__++) \ ERTS_DBG_SET_INVALID_RUNQP((RQ)->procs.prio_info[pix__].migrate.runq,\ (DBG_ID)); \ } while (0) #else #define ERTS_RUNQ_RESET_MIGRATION_PATHS(RQ, DBG_ID) \ ERTS_RUNQ_RESET_MIGRATION_PATHS__((RQ)) #endif ErtsSchedSuspendResult erts_schedulers_state(Uint *total, Uint *online, Uint *active, int yield_allowed) { int res; erts_aint32_t changing; erts_smp_mtx_lock(&schdlr_sspnd.mtx); changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); if (yield_allowed && (changing & ~ERTS_SCHDLR_SSPND_CHNG_WAITER)) res = ERTS_SCHDLR_SSPND_YIELD_RESTART; else { *active = *online = schdlr_sspnd.online; if (ongoing_multi_scheduling_block()) *active = 1; res = ERTS_SCHDLR_SSPND_DONE; } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); *total = erts_no_schedulers; return res; } ErtsSchedSuspendResult erts_set_schedulers_online(Process *p, ErtsProcLocks plocks, Sint new_no, Sint *old_no) { int ix, res, no, have_unlocked_plocks; erts_aint32_t changing; if (new_no < 1 || erts_no_schedulers < new_no) return ERTS_SCHDLR_SSPND_EINVAL; erts_smp_mtx_lock(&schdlr_sspnd.mtx); have_unlocked_plocks = 0; no = (int) new_no; changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); if (changing) { res = ERTS_SCHDLR_SSPND_YIELD_RESTART; } else { int online = *old_no = schdlr_sspnd.online; if (no == schdlr_sspnd.online) { res = ERTS_SCHDLR_SSPND_DONE; } else { ERTS_SCHDLR_SSPND_CHNG_SET((ERTS_SCHDLR_SSPND_CHNG_ONLN | ERTS_SCHDLR_SSPND_CHNG_WAITER), 0); schdlr_sspnd.online = no; if (no > online) { int ix; schdlr_sspnd.wait_curr_online = no; if (ongoing_multi_scheduling_block()) { for (ix = online; ix < no; ix++) erts_sched_poke(ERTS_SCHED_SLEEP_INFO_IX(ix)); } else if (erts_common_run_queue) { for (ix = online; ix < no; ix++) scheduler_ix_resume_wake(ix); } else { if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); erts_smp_mtx_lock(&balance_info.update_mtx); for (ix = online; ix < no; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); erts_smp_runq_lock(rq); ERTS_RUNQ_RESET_SUSPEND_INFO(rq, 0x5); erts_smp_runq_unlock(rq); scheduler_ix_resume_wake(ix); } /* * Spread evacuation paths among all online * run queues. */ for (ix = no; ix < erts_no_run_queues; ix++) { ErtsRunQueue *from_rq = ERTS_RUNQ_IX(ix); ErtsRunQueue *to_rq = ERTS_RUNQ_IX(ix % no); evacuate_run_queue(from_rq, to_rq); } set_no_used_runqs(no); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_mtx_lock(&schdlr_sspnd.mtx); } res = ERTS_SCHDLR_SSPND_DONE; } else /* if (no < online) */ { if (p->scheduler_data->no <= no) { res = ERTS_SCHDLR_SSPND_DONE; schdlr_sspnd.wait_curr_online = no; } else { /* * Yield! Current process needs to migrate * before bif returns. */ res = ERTS_SCHDLR_SSPND_YIELD_DONE; schdlr_sspnd.wait_curr_online = no+1; } if (ongoing_multi_scheduling_block()) { for (ix = no; ix < online; ix++) erts_sched_poke(ERTS_SCHED_SLEEP_INFO_IX(ix)); } else if (erts_common_run_queue) { for (ix = no; ix < online; ix++) { ErtsSchedulerSleepInfo *ssi; ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); erts_smp_atomic32_bor(&ssi->flags, ERTS_SSI_FLG_SUSPENDED); } wake_all_schedulers(); } else { if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); erts_smp_mtx_lock(&balance_info.update_mtx); for (ix = 0; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); erts_smp_runq_lock(rq); ERTS_RUNQ_RESET_MIGRATION_PATHS(rq, 0x6); erts_smp_runq_unlock(rq); } /* * Evacutation order important! Newly suspended run queues * has to be evacuated last. */ for (ix = erts_no_run_queues-1; ix >= no; ix--) evacuate_run_queue(ERTS_RUNQ_IX(ix), ERTS_RUNQ_IX(ix % no)); set_no_used_runqs(no); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_mtx_lock(&schdlr_sspnd.mtx); for (ix = no; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); wake_scheduler(rq, 0, 1); } } } erts_smp_activity_begin(ERTS_ACTIVITY_WAIT, susp_sched_prep_block, susp_sched_resume_block, NULL); while (schdlr_sspnd.curr_online != schdlr_sspnd.wait_curr_online) erts_smp_cnd_wait(&schdlr_sspnd.cnd, &schdlr_sspnd.mtx); erts_smp_activity_end(ERTS_ACTIVITY_WAIT, susp_sched_prep_block, susp_sched_resume_block, NULL); ASSERT(res != ERTS_SCHDLR_SSPND_DONE ? (ERTS_SCHDLR_SSPND_CHNG_WAITER & erts_smp_atomic32_read(&schdlr_sspnd.changing)) : (ERTS_SCHDLR_SSPND_CHNG_WAITER == erts_smp_atomic32_read(&schdlr_sspnd.changing))); erts_smp_atomic32_band(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_WAITER); } } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (have_unlocked_plocks) erts_smp_proc_lock(p, plocks); return res; } ErtsSchedSuspendResult erts_block_multi_scheduling(Process *p, ErtsProcLocks plocks, int on, int all) { int ix, res, have_unlocked_plocks = 0; erts_aint32_t changing; ErtsProcList *plp; erts_smp_mtx_lock(&schdlr_sspnd.mtx); changing = erts_smp_atomic32_read(&schdlr_sspnd.changing); if (changing) { res = ERTS_SCHDLR_SSPND_YIELD_RESTART; /* Yield */ } else if (on) { /* ------ BLOCK ------ */ if (schdlr_sspnd.msb.procs) { plp = proclist_create(p); plp->next = schdlr_sspnd.msb.procs; schdlr_sspnd.msb.procs = plp; p->flags |= F_HAVE_BLCKD_MSCHED; ASSERT(erts_smp_atomic32_read(&schdlr_sspnd.active) == 1); ASSERT(p->scheduler_data->no == 1); res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; } else { int online = schdlr_sspnd.online; p->flags |= F_HAVE_BLCKD_MSCHED; if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } ASSERT(0 == erts_smp_atomic32_read(&schdlr_sspnd.msb.ongoing)); erts_smp_atomic32_set(&schdlr_sspnd.msb.ongoing, 1); if (online == 1) { res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; ASSERT(erts_smp_atomic32_read(&schdlr_sspnd.active) == 1); ASSERT(p->scheduler_data->no == 1); } else { ERTS_SCHDLR_SSPND_CHNG_SET((ERTS_SCHDLR_SSPND_CHNG_MSB | ERTS_SCHDLR_SSPND_CHNG_WAITER), 0); if (p->scheduler_data->no == 1) { res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; schdlr_sspnd.msb.wait_active = 1; } else { /* * Yield! Current process needs to migrate * before bif returns. */ res = ERTS_SCHDLR_SSPND_YIELD_DONE_MSCHED_BLOCKED; schdlr_sspnd.msb.wait_active = 2; } if (erts_common_run_queue) { for (ix = 1; ix < online; ix++) erts_smp_atomic32_bor(&ERTS_SCHED_SLEEP_INFO_IX(ix)->flags, ERTS_SSI_FLG_SUSPENDED); wake_all_schedulers(); } else { erts_smp_mtx_unlock(&schdlr_sspnd.mtx); erts_smp_mtx_lock(&balance_info.update_mtx); set_no_used_runqs(1); for (ix = 0; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); erts_smp_runq_lock(rq); ASSERT(!(rq->flags & ERTS_RUNQ_FLG_SUSPENDED)); ERTS_RUNQ_RESET_MIGRATION_PATHS(rq, 0x7); erts_smp_runq_unlock(rq); } /* * Evacuate all activities in all other run queues * into the first run queue. Note order is important, * online run queues has to be evacuated last. */ for (ix = erts_no_run_queues-1; ix >= 1; ix--) evacuate_run_queue(ERTS_RUNQ_IX(ix), ERTS_RUNQ_IX(0)); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_mtx_lock(&schdlr_sspnd.mtx); } erts_smp_activity_begin(ERTS_ACTIVITY_WAIT, susp_sched_prep_block, susp_sched_resume_block, NULL); while (erts_smp_atomic32_read(&schdlr_sspnd.active) != schdlr_sspnd.msb.wait_active) erts_smp_cnd_wait(&schdlr_sspnd.cnd, &schdlr_sspnd.mtx); erts_smp_activity_end(ERTS_ACTIVITY_WAIT, susp_sched_prep_block, susp_sched_resume_block, NULL); ASSERT(res != ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED ? (ERTS_SCHDLR_SSPND_CHNG_WAITER & erts_smp_atomic32_read(&schdlr_sspnd.changing)) : (ERTS_SCHDLR_SSPND_CHNG_WAITER == erts_smp_atomic32_read(&schdlr_sspnd.changing))); erts_smp_atomic32_band(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_WAITER); } plp = proclist_create(p); plp->next = schdlr_sspnd.msb.procs; schdlr_sspnd.msb.procs = plp; #ifdef DEBUG ERTS_FOREACH_RUNQ(srq, { if (srq != ERTS_RUNQ_IX(0)) { ASSERT(ERTS_EMPTY_RUNQ(srq)); ASSERT(srq->flags & ERTS_RUNQ_FLG_SUSPENDED); } }); #endif ASSERT(p->scheduler_data); } } else if (!ongoing_multi_scheduling_block()) { /* unblock not ongoing */ ASSERT(!schdlr_sspnd.msb.procs); res = ERTS_SCHDLR_SSPND_DONE; } else { /* ------ UNBLOCK ------ */ if (p->flags & F_HAVE_BLCKD_MSCHED) { ErtsProcList **plpp = &schdlr_sspnd.msb.procs; plp = schdlr_sspnd.msb.procs; while (plp) { if (!proclist_same(plp, p)){ plpp = &plp->next; plp = plp->next; } else { *plpp = plp->next; proclist_destroy(plp); if (!all) break; plp = *plpp; } } } if (schdlr_sspnd.msb.procs) res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; else { ERTS_SCHDLR_SSPND_CHNG_SET(ERTS_SCHDLR_SSPND_CHNG_MSB, 0); #ifdef DEBUG ERTS_FOREACH_RUNQ(rq, { if (rq != p->scheduler_data->run_queue) { if (!ERTS_EMPTY_RUNQ(rq)) { Process *rp; int pix; ASSERT(rq->ports.info.len == 0); for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { for (rp = rq->procs.prio[pix].first; rp; rp = rp->next) { ASSERT(rp->bound_runq); } } } ASSERT(rq->flags & ERTS_RUNQ_FLG_SUSPENDED); } }); #endif p->flags &= ~F_HAVE_BLCKD_MSCHED; erts_smp_atomic32_set(&schdlr_sspnd.msb.ongoing, 0); if (schdlr_sspnd.online == 1) { /* No schedulers to resume */ ASSERT(erts_smp_atomic32_read(&schdlr_sspnd.active) == 1); ERTS_SCHDLR_SSPND_CHNG_SET(0, ERTS_SCHDLR_SSPND_CHNG_MSB); } else if (erts_common_run_queue) { for (ix = 1; ix < schdlr_sspnd.online; ix++) erts_smp_atomic32_band(&ERTS_SCHED_SLEEP_INFO_IX(ix)->flags, ~ERTS_SSI_FLG_SUSPENDED); wake_all_schedulers(); } else { int online = schdlr_sspnd.online; erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } erts_smp_mtx_lock(&balance_info.update_mtx); /* Resume all online run queues */ for (ix = 1; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); erts_smp_runq_lock(rq); ERTS_RUNQ_RESET_SUSPEND_INFO(rq, 0x4); erts_smp_runq_unlock(rq); scheduler_ix_resume_wake(ix); } /* Spread evacuation paths among all online run queues */ for (ix = online; ix < erts_no_run_queues; ix++) evacuate_run_queue(ERTS_RUNQ_IX(ix), ERTS_RUNQ_IX(ix % online)); set_no_used_runqs(online); /* Make sure that we balance soon... */ balance_info.forced_check_balance = 1; erts_smp_runq_lock(ERTS_RUNQ_IX(0)); ERTS_RUNQ_IX(0)->check_balance_reds = 0; erts_smp_runq_unlock(ERTS_RUNQ_IX(0)); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_mtx_lock(&schdlr_sspnd.mtx); } res = ERTS_SCHDLR_SSPND_DONE; } } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (have_unlocked_plocks) erts_smp_proc_lock(p, plocks); return res; } #ifdef DEBUG void erts_dbg_multi_scheduling_return_trap(Process *p, Eterm return_value) { if (return_value == am_blocked) { erts_aint32_t active = erts_smp_atomic32_read(&schdlr_sspnd.active); ASSERT(1 <= active && active <= 2); ASSERT(ERTS_PROC_GET_SCHDATA(p)->no == 1); } } #endif int erts_is_multi_scheduling_blocked(void) { int res; erts_smp_mtx_lock(&schdlr_sspnd.mtx); res = schdlr_sspnd.msb.procs != NULL; erts_smp_mtx_unlock(&schdlr_sspnd.mtx); return res; } Eterm erts_multi_scheduling_blockers(Process *p) { Eterm res = NIL; erts_smp_mtx_lock(&schdlr_sspnd.mtx); if (schdlr_sspnd.msb.procs) { Eterm *hp, *hp_end; ErtsProcList *plp1, *plp2; Uint max_size; ASSERT(schdlr_sspnd.msb.procs); for (max_size = 0, plp1 = schdlr_sspnd.msb.procs; plp1; plp1 = plp1->next) { max_size += 2; } ASSERT(max_size); hp = HAlloc(p, max_size); hp_end = hp + max_size; for (plp1 = schdlr_sspnd.msb.procs; plp1; plp1 = plp1->next) { for (plp2 = schdlr_sspnd.msb.procs; plp2->pid != plp1->pid; plp2 = plp2->next); if (plp2 == plp1) { res = CONS(hp, plp1->pid, res); hp += 2; } /* else: already in result list */ } HRelease(p, hp_end, hp); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); return res; } static void * sched_thread_func(void *vesdp) { #ifdef ERTS_SMP Uint no = ((ErtsSchedulerData *) vesdp)->no; #endif #ifdef ERTS_ENABLE_LOCK_CHECK { char buf[31]; erts_snprintf(&buf[0], 31, "scheduler %beu", no); erts_lc_set_thread_name(&buf[0]); } #endif erts_alloc_reg_scheduler_id(no); erts_tsd_set(sched_data_key, vesdp); #ifdef ERTS_SMP erts_sched_init_check_cpu_bind((ErtsSchedulerData *) vesdp); erts_proc_lock_prepare_proc_lock_waiter(); ERTS_SCHED_SLEEP_INFO_IX(no - 1)->event = erts_tse_fetch(); #endif erts_register_blockable_thread(); #ifdef HIPE hipe_thread_signal_init(); #endif erts_thread_init_float(); erts_smp_mtx_lock(&schdlr_sspnd.mtx); ASSERT(erts_smp_atomic32_read(&schdlr_sspnd.changing) & ERTS_SCHDLR_SSPND_CHNG_ONLN); if (--schdlr_sspnd.curr_online == schdlr_sspnd.wait_curr_online) { erts_smp_atomic32_band(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_ONLN); if (((ErtsSchedulerData *) vesdp)->no != 1) erts_smp_cnd_signal(&schdlr_sspnd.cnd); } if (((ErtsSchedulerData *) vesdp)->no == 1) { if (schdlr_sspnd.curr_online != schdlr_sspnd.wait_curr_online) { erts_smp_activity_begin(ERTS_ACTIVITY_WAIT, susp_sched_prep_block, susp_sched_resume_block, NULL); while (schdlr_sspnd.curr_online != schdlr_sspnd.wait_curr_online) erts_smp_cnd_wait(&schdlr_sspnd.cnd, &schdlr_sspnd.mtx); erts_smp_activity_end(ERTS_ACTIVITY_WAIT, susp_sched_prep_block, susp_sched_resume_block, NULL); } ERTS_SCHDLR_SSPND_CHNG_SET(0, ERTS_SCHDLR_SSPND_CHNG_WAITER); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); #ifdef ERTS_DO_VERIFY_UNUSED_TEMP_ALLOC ((ErtsSchedulerData *) vesdp)->verify_unused_temp_alloc = erts_alloc_get_verify_unused_temp_alloc( &((ErtsSchedulerData *) vesdp)->verify_unused_temp_alloc_data); ERTS_VERIFY_UNUSED_TEMP_ALLOC(NULL); #endif process_main(); /* No schedulers should *ever* terminate */ erl_exit(ERTS_ABORT_EXIT, "Scheduler thread number %beu terminated\n", ((ErtsSchedulerData *) vesdp)->no); return NULL; } void erts_start_schedulers(void) { int res = 0; Uint actual = 0; Uint wanted = erts_no_schedulers; Uint wanted_no_schedulers = erts_no_schedulers; ethr_thr_opts opts = ETHR_THR_OPTS_DEFAULT_INITER; opts.detached = 1; opts.suggested_stack_size = erts_sched_thread_suggested_stack_size; if (wanted < 1) wanted = 1; if (wanted > ERTS_MAX_NO_OF_SCHEDULERS) { wanted = ERTS_MAX_NO_OF_SCHEDULERS; res = ENOTSUP; } erts_block_system(0); while (actual < wanted) { ErtsSchedulerData *esdp = ERTS_SCHEDULER_IX(actual); actual++; ASSERT(actual == esdp->no); res = ethr_thr_create(&esdp->tid,sched_thread_func,(void*)esdp,&opts); if (res != 0) { actual--; break; } } erts_no_schedulers = actual; erts_release_system(); if (actual < 1) erl_exit(1, "Failed to create any scheduler-threads: %s (%d)\n", erl_errno_id(res), res); if (res != 0) { erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf(); ASSERT(actual != wanted_no_schedulers); erts_dsprintf(dsbufp, "Failed to create %beu scheduler-threads (%s:%d); " "only %beu scheduler-thread%s created.\n", wanted_no_schedulers, erl_errno_id(res), res, actual, actual == 1 ? " was" : "s were"); erts_send_error_to_logger_nogl(dsbufp); } } #endif /* ERTS_SMP */ #ifdef ERTS_SMP static void add_pend_suspend(Process *suspendee, Eterm originator_pid, void (*handle_func)(Process *, ErtsProcLocks, int, Eterm)) { ErtsPendingSuspend *psp = erts_alloc(ERTS_ALC_T_PEND_SUSPEND, sizeof(ErtsPendingSuspend)); psp->next = NULL; #ifdef DEBUG #if defined(ARCH_64) && !HALFWORD_HEAP psp->end = (ErtsPendingSuspend *) 0xdeaddeaddeaddead; #else psp->end = (ErtsPendingSuspend *) 0xdeaddead; #endif #endif psp->pid = originator_pid; psp->handle_func = handle_func; if (suspendee->pending_suspenders) suspendee->pending_suspenders->end->next = psp; else suspendee->pending_suspenders = psp; suspendee->pending_suspenders->end = psp; } static void handle_pending_suspend(Process *p, ErtsProcLocks p_locks) { ErtsPendingSuspend *psp; int is_alive = !ERTS_PROC_IS_EXITING(p); ERTS_SMP_LC_ASSERT(p_locks & ERTS_PROC_LOCK_STATUS); /* * New pending suspenders might appear while we are processing * (since we may release the status lock on p while processing). */ while (p->pending_suspenders) { psp = p->pending_suspenders; p->pending_suspenders = NULL; while (psp) { ErtsPendingSuspend *free_psp; (*psp->handle_func)(p, p_locks, is_alive, psp->pid); free_psp = psp; psp = psp->next; erts_free(ERTS_ALC_T_PEND_SUSPEND, (void *) free_psp); } } } static ERTS_INLINE void cancel_suspend_of_suspendee(Process *p, ErtsProcLocks p_locks) { if (is_not_nil(p->suspendee)) { Process *rp; if (!(p_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); rp = erts_pid2proc(p, p_locks|ERTS_PROC_LOCK_STATUS, p->suspendee, ERTS_PROC_LOCK_STATUS); if (rp) { erts_resume(rp, ERTS_PROC_LOCK_STATUS); erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS); } if (!(p_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); p->suspendee = NIL; } } static void handle_pend_sync_suspend(Process *suspendee, ErtsProcLocks suspendee_locks, int suspendee_alive, Eterm suspender_pid) { Process *suspender; ERTS_SMP_LC_ASSERT(suspendee_locks & ERTS_PROC_LOCK_STATUS); suspender = erts_pid2proc(suspendee, suspendee_locks, suspender_pid, ERTS_PROC_LOCK_STATUS); if (suspender) { ASSERT(is_nil(suspender->suspendee)); if (suspendee_alive) { ErtsRunQueue *rq = erts_get_runq_proc(suspendee); erts_smp_runq_lock(rq); suspend_process(rq, suspendee); erts_smp_runq_unlock(rq); suspender->suspendee = suspendee->id; } /* suspender is suspended waiting for suspendee to suspend; resume suspender */ resume_process(suspender); erts_smp_proc_unlock(suspender, ERTS_PROC_LOCK_STATUS); } } static Process * pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks, int suspend) { Process *rp; int unlock_c_p_status; ERTS_SMP_LC_ASSERT(c_p_locks == erts_proc_lc_my_proc_locks(c_p)); ERTS_SMP_LC_ASSERT(c_p_locks & ERTS_PROC_LOCK_MAIN); ERTS_SMP_LC_ASSERT(pid_locks & (ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS)); if (c_p->id == pid) return erts_pid2proc(c_p, c_p_locks, pid, pid_locks); if (c_p_locks & ERTS_PROC_LOCK_STATUS) unlock_c_p_status = 0; else { unlock_c_p_status = 1; erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_STATUS); } if (c_p->suspendee == pid) { /* Process previously suspended by c_p (below)... */ ErtsProcLocks rp_locks = pid_locks|ERTS_PROC_LOCK_STATUS; rp = erts_pid2proc(c_p, c_p_locks|ERTS_PROC_LOCK_STATUS, pid, rp_locks); c_p->suspendee = NIL; ASSERT(c_p->flags & F_P2PNR_RESCHED); c_p->flags &= ~F_P2PNR_RESCHED; if (!suspend && rp) resume_process(rp); } else { ErtsRunQueue *cp_rq, *rp_rq; rp = erts_pid2proc(c_p, c_p_locks|ERTS_PROC_LOCK_STATUS, pid, ERTS_PROC_LOCK_STATUS); if (!rp) { c_p->flags &= ~F_P2PNR_RESCHED; goto done; } ASSERT(!(c_p->flags & F_P2PNR_RESCHED)); cp_rq = erts_get_runq_proc(c_p); rp_rq = erts_get_runq_proc(rp); erts_smp_runqs_lock(cp_rq, rp_rq); if (rp->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) { running: /* Phiu... */ /* * If we got pending suspenders and suspend ourselves waiting * to suspend another process we might deadlock. * In this case we have to yield, be suspended by * someone else and then do it all over again. */ if (!c_p->pending_suspenders) { /* Mark rp pending for suspend by c_p */ add_pend_suspend(rp, c_p->id, handle_pend_sync_suspend); ASSERT(is_nil(c_p->suspendee)); /* Suspend c_p; when rp is suspended c_p will be resumed. */ suspend_process(cp_rq, c_p); c_p->flags |= F_P2PNR_RESCHED; } /* Yield (caller is assumed to yield immediately in bif). */ erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS); rp = ERTS_PROC_LOCK_BUSY; } else { ErtsProcLocks need_locks = pid_locks & ~ERTS_PROC_LOCK_STATUS; if (need_locks && erts_smp_proc_trylock(rp, need_locks) == EBUSY) { erts_smp_runqs_unlock(cp_rq, rp_rq); erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS); rp = erts_pid2proc(c_p, c_p_locks|ERTS_PROC_LOCK_STATUS, pid, pid_locks|ERTS_PROC_LOCK_STATUS); if (!rp) goto done; /* run-queues may have changed */ cp_rq = erts_get_runq_proc(c_p); rp_rq = erts_get_runq_proc(rp); erts_smp_runqs_lock(cp_rq, rp_rq); if (rp->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) { /* Ahh... */ erts_smp_proc_unlock(rp, pid_locks & ~ERTS_PROC_LOCK_STATUS); goto running; } } /* rp is not running and we got the locks we want... */ if (suspend) suspend_process(rp_rq, rp); } erts_smp_runqs_unlock(cp_rq, rp_rq); } done: if (rp && rp != ERTS_PROC_LOCK_BUSY && !(pid_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS); if (unlock_c_p_status) erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_STATUS); return rp; } /* * Like erts_pid2proc() but: * * * At least ERTS_PROC_LOCK_MAIN have to be held on c_p. * * At least ERTS_PROC_LOCK_MAIN have to be taken on pid. * * It also waits for proc to be in a state != running and garbing. * * If ERTS_PROC_LOCK_BUSY is returned, the calling process has to * yield (ERTS_BIF_YIELD[0-3]()). c_p might in this case have been * suspended. */ Process * erts_pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { return pid2proc_not_running(c_p, c_p_locks, pid, pid_locks, 0); } /* * Like erts_pid2proc_not_running(), but hands over the process * in a suspended state unless (c_p is looked up). */ Process * erts_pid2proc_suspend(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { return pid2proc_not_running(c_p, c_p_locks, pid, pid_locks, 1); } /* * erts_pid2proc_nropt() is normally the same as * erts_pid2proc_not_running(). However it is only * to be used when 'not running' is a pure optimization, * not a requirement. */ Process * erts_pid2proc_nropt(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { if (erts_disable_proc_not_running_opt) return erts_pid2proc(c_p, c_p_locks, pid, pid_locks); else return erts_pid2proc_not_running(c_p, c_p_locks, pid, pid_locks); } static ERTS_INLINE void do_bif_suspend_process(ErtsSuspendMonitor *smon, Process *suspendee, ErtsRunQueue *locked_runq) { ASSERT(suspendee); ASSERT(!suspendee->is_exiting); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(suspendee)); if (smon) { if (!smon->active) { ErtsRunQueue *rq; if (locked_runq) rq = locked_runq; else { rq = erts_get_runq_proc(suspendee); erts_smp_runq_lock(rq); } suspend_process(rq, suspendee); if (!locked_runq) erts_smp_runq_unlock(rq); } smon->active += smon->pending; ASSERT(smon->active); smon->pending = 0; } } static void handle_pend_bif_sync_suspend(Process *suspendee, ErtsProcLocks suspendee_locks, int suspendee_alive, Eterm suspender_pid) { Process *suspender; ERTS_SMP_LC_ASSERT(suspendee_locks & ERTS_PROC_LOCK_STATUS); suspender = erts_pid2proc(suspendee, suspendee_locks, suspender_pid, ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS); if (suspender) { ASSERT(is_nil(suspender->suspendee)); if (!suspendee_alive) erts_delete_suspend_monitor(&suspender->suspend_monitors, suspendee->id); else { ErtsSuspendMonitor *smon; smon = erts_lookup_suspend_monitor(suspender->suspend_monitors, suspendee->id); do_bif_suspend_process(smon, suspendee, NULL); suspender->suspendee = suspendee->id; } /* suspender is suspended waiting for suspendee to suspend; resume suspender */ resume_process(suspender); erts_smp_proc_unlock(suspender, ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS); } } static void handle_pend_bif_async_suspend(Process *suspendee, ErtsProcLocks suspendee_locks, int suspendee_alive, Eterm suspender_pid) { Process *suspender; ERTS_SMP_LC_ASSERT(suspendee_locks & ERTS_PROC_LOCK_STATUS); suspender = erts_pid2proc(suspendee, suspendee_locks, suspender_pid, ERTS_PROC_LOCK_LINK); if (suspender) { ASSERT(is_nil(suspender->suspendee)); if (!suspendee_alive) erts_delete_suspend_monitor(&suspender->suspend_monitors, suspendee->id); else { ErtsSuspendMonitor *smon; smon = erts_lookup_suspend_monitor(suspender->suspend_monitors, suspendee->id); do_bif_suspend_process(smon, suspendee, NULL); } erts_smp_proc_unlock(suspender, ERTS_PROC_LOCK_LINK); } } #else /* * Non-smp version of erts_pid2proc_suspend(). */ Process * erts_pid2proc_suspend(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { Process *rp = erts_pid2proc(c_p, c_p_locks, pid, pid_locks); if (rp) erts_suspend(rp, pid_locks, NULL); return rp; } #endif /* ERTS_SMP */ /* * The erlang:suspend_process/2 BIF */ BIF_RETTYPE suspend_process_2(BIF_ALIST_2) { Eterm res; Process* suspendee = NULL; ErtsSuspendMonitor *smon; ErtsProcLocks xlocks = (ErtsProcLocks) 0; /* Options and default values: */ int asynchronous = 0; int unless_suspending = 0; if (BIF_P->id == BIF_ARG_1) goto badarg; /* We are not allowed to suspend ourselves */ if (is_not_nil(BIF_ARG_2)) { /* Parse option list */ Eterm arg = BIF_ARG_2; while (is_list(arg)) { Eterm *lp = list_val(arg); arg = CAR(lp); switch (arg) { case am_unless_suspending: unless_suspending = 1; break; case am_asynchronous: asynchronous = 1; break; default: goto badarg; } arg = CDR(lp); } if (is_not_nil(arg)) goto badarg; } xlocks = ERTS_PROC_LOCK_LINK | (asynchronous ? (ErtsProcLocks) 0 : ERTS_PROC_LOCK_STATUS); erts_smp_proc_lock(BIF_P, xlocks); suspendee = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN|xlocks, BIF_ARG_1, ERTS_PROC_LOCK_STATUS); if (!suspendee) goto no_suspendee; smon = erts_add_or_lookup_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); #ifndef ERTS_SMP /* no ERTS_SMP */ /* This is really a piece of cake without SMP support... */ if (!smon->active) { suspend_process(erts_common_run_queue, suspendee); smon->active++; res = am_true; } else if (unless_suspending) res = am_false; else if (smon->active == INT_MAX) goto system_limit; else { smon->active++; res = am_true; } #else /* ERTS_SMP */ /* ... but a little trickier with SMP support ... */ if (asynchronous) { /* --- Asynchronous suspend begin ---------------------------------- */ ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_LINK & erts_proc_lc_my_proc_locks(BIF_P)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS == erts_proc_lc_my_proc_locks(suspendee)); if (smon->active) { smon->active += smon->pending; smon->pending = 0; if (unless_suspending) res = am_false; else if (smon->active == INT_MAX) goto system_limit; else { smon->active++; res = am_true; } /* done */ } else { /* We havn't got any active suspends on the suspendee */ if (smon->pending && unless_suspending) res = am_false; else { ErtsRunQueue *rq; if (smon->pending == INT_MAX) goto system_limit; smon->pending++; rq = erts_get_runq_proc(suspendee); erts_smp_runq_lock(rq); if (suspendee->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) add_pend_suspend(suspendee, BIF_P->id, handle_pend_bif_async_suspend); else do_bif_suspend_process(smon, suspendee, rq); erts_smp_runq_unlock(rq); res = am_true; } /* done */ } /* --- Asynchronous suspend end ------------------------------------ */ } else /* if (!asynchronous) */ { /* --- Synchronous suspend begin ----------------------------------- */ ERTS_SMP_LC_ASSERT(((ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS) & erts_proc_lc_my_proc_locks(BIF_P)) == (ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS == erts_proc_lc_my_proc_locks(suspendee)); if (BIF_P->suspendee == BIF_ARG_1) { /* We are back after a yield and the suspendee has been suspended on behalf of us. */ ASSERT(smon->active >= 1); BIF_P->suspendee = NIL; res = (!unless_suspending || smon->active == 1 ? am_true : am_false); /* done */ } else if (smon->active) { if (unless_suspending) res = am_false; else { smon->active++; res = am_true; } /* done */ } else { ErtsRunQueue *cp_rq, *s_rq; /* We haven't got any active suspends on the suspendee */ /* * If we have pending suspenders and suspend ourselves waiting * to suspend another process, or suspend another process * we might deadlock. In this case we have to yield, * be suspended by someone else, and then do it all over again. */ if (BIF_P->pending_suspenders) goto yield; if (!unless_suspending && smon->pending == INT_MAX) goto system_limit; if (!unless_suspending || smon->pending == 0) smon->pending++; cp_rq = erts_get_runq_proc(BIF_P); s_rq = erts_get_runq_proc(suspendee); erts_smp_runqs_lock(cp_rq, s_rq); if (!(suspendee->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING)) { do_bif_suspend_process(smon, suspendee, s_rq); erts_smp_runqs_unlock(cp_rq, s_rq); res = (!unless_suspending || smon->active == 1 ? am_true : am_false); /* done */ } else { /* Mark suspendee pending for suspend by BIF_P */ add_pend_suspend(suspendee, BIF_P->id, handle_pend_bif_sync_suspend); ASSERT(is_nil(BIF_P->suspendee)); /* * Suspend BIF_P; when suspendee is suspended, BIF_P * will be resumed and this BIF will be called again. * This time with BIF_P->suspendee == BIF_ARG_1 (see * above). */ suspend_process(cp_rq, BIF_P); erts_smp_runqs_unlock(cp_rq, s_rq); goto yield; } } /* --- Synchronous suspend end ------------------------------------- */ } #endif /* ERTS_SMP */ ASSERT(suspendee->status == P_SUSPENDED || (asynchronous && smon->pending)); ASSERT(suspendee->status == P_SUSPENDED || !smon->active); erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); erts_smp_proc_unlock(BIF_P, xlocks); BIF_RET(res); system_limit: ERTS_BIF_PREP_ERROR(res, BIF_P, SYSTEM_LIMIT); goto do_return; no_suspendee: #ifdef ERTS_SMP BIF_P->suspendee = NIL; #endif erts_delete_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); badarg: ERTS_BIF_PREP_ERROR(res, BIF_P, BADARG); #ifdef ERTS_SMP goto do_return; yield: ERTS_BIF_PREP_YIELD2(res, bif_export[BIF_suspend_process_2], BIF_P, BIF_ARG_1, BIF_ARG_2); #endif do_return: if (suspendee) erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); if (xlocks) erts_smp_proc_unlock(BIF_P, xlocks); return res; } /* * The erlang:resume_process/1 BIF */ BIF_RETTYPE resume_process_1(BIF_ALIST_1) { ErtsSuspendMonitor *smon; Process *suspendee; int is_active; if (BIF_P->id == BIF_ARG_1) BIF_ERROR(BIF_P, BADARG); erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK); smon = erts_lookup_suspend_monitor(BIF_P->suspend_monitors, BIF_ARG_1); if (!smon) { /* No previous suspend or dead suspendee */ goto error; } else if (smon->pending) { smon->pending--; ASSERT(smon->pending >= 0); if (smon->active) { smon->active += smon->pending; smon->pending = 0; } is_active = smon->active; } else if (smon->active) { smon->active--; ASSERT(smon->pending >= 0); is_active = 1; } else { /* No previous suspend or dead suspendee */ goto error; } if (smon->active || smon->pending || !is_active) { /* Leave the suspendee as it is; just verify that it is still alive */ suspendee = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK, BIF_ARG_1, 0); if (!suspendee) goto no_suspendee; } else { /* Resume */ suspendee = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK, BIF_ARG_1, ERTS_PROC_LOCK_STATUS); if (!suspendee) goto no_suspendee; ASSERT(suspendee->status == P_SUSPENDED || (suspendee->status == P_GARBING && suspendee->gcstatus == P_SUSPENDED)); resume_process(suspendee); erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); } if (!smon->active && !smon->pending) erts_delete_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK); BIF_RET(am_true); no_suspendee: /* cleanup */ erts_delete_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); error: erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK); BIF_ERROR(BIF_P, BADARG); } Uint erts_run_queues_len(Uint *qlen) { int i = 0; Uint len = 0; ERTS_ATOMIC_FOREACH_RUNQ(rq, { if (qlen) qlen[i++] = rq->procs.len; len += rq->procs.len; } ); return len; } #ifdef HARDDEBUG_RUNQS static void check_procs_runq(ErtsRunQueue *runq, Process *p_in_q, Process *p_not_in_q) { int len[ERTS_NO_PROC_PRIO_LEVELS] = {0}; int tot_len; int prioq, prio; int found_p_in_q; Process *p, *prevp; found_p_in_q = 0; for (prioq = 0; prioq < ERTS_NO_PROC_PRIO_LEVELS - 1; prioq++) { prevp = NULL; for (p = runq->procs.prio[prioq].first; p; p = p->next) { ASSERT(p != p_not_in_q); if (p == p_in_q) found_p_in_q = 1; switch (p->prio) { case PRIORITY_MAX: case PRIORITY_HIGH: case PRIORITY_NORMAL: ASSERT(prioq == p->prio); break; case PRIORITY_LOW: ASSERT(prioq == PRIORITY_NORMAL); break; default: ASSERT(!"Bad prio on process"); } len[p->prio]++; ASSERT(prevp == p->prev); if (p->prev) { ASSERT(p->prev->next == p); } else { ASSERT(runq->procs.prio[prioq].first == p); } if (p->next) { ASSERT(p->next->prev == p); } else { ASSERT(runq->procs.prio[prioq].last == p); } ASSERT(p->run_queue == runq); prevp = p; } } ASSERT(!p_in_q || found_p_in_q); tot_len = 0; for (prio = 0; prio < ERTS_NO_PROC_PRIO_LEVELS; prio++) { ASSERT(len[prio] == runq->procs.prio_info[prio].len); if (len[prio]) { ASSERT(runq->flags & (1 << prio)); } else { ASSERT(!(runq->flags & (1 << prio))); } tot_len += len[prio]; } ASSERT(runq->procs.len == tot_len); } # define ERTS_DBG_CHK_PROCS_RUNQ(RQ) check_procs_runq((RQ), NULL, NULL) # define ERTS_DBG_CHK_PROCS_RUNQ_PROC(RQ, P) check_procs_runq((RQ), (P), NULL) # define ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(RQ, P) check_procs_runq((RQ), NULL, (P)) #else # define ERTS_DBG_CHK_PROCS_RUNQ(RQ) # define ERTS_DBG_CHK_PROCS_RUNQ_PROC(RQ, P) # define ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(RQ, P) #endif static ERTS_INLINE void enqueue_process(ErtsRunQueue *runq, Process *p) { ErtsRunPrioQueue *rpq; ErtsRunQueueInfo *rqi; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); ASSERT(p->bound_runq || !(runq->flags & ERTS_RUNQ_FLG_SUSPENDED)); rqi = &runq->procs.prio_info[p->prio]; rqi->len++; if (rqi->max_len < rqi->len) rqi->max_len = rqi->len; runq->procs.len++; runq->len++; if (runq->max_len < runq->len) runq->max_len = runq->len; runq->flags |= (1 << p->prio); rpq = (p->prio == PRIORITY_LOW ? &runq->procs.prio[PRIORITY_NORMAL] : &runq->procs.prio[p->prio]); p->next = NULL; p->prev = rpq->last; if (rpq->last) rpq->last->next = p; else rpq->first = p; rpq->last = p; switch (p->status) { case P_EXITING: break; case P_GARBING: p->gcstatus = P_RUNABLE; break; default: p->status = P_RUNABLE; break; } #ifdef ERTS_SMP p->status_flags |= ERTS_PROC_SFLG_INRUNQ; #endif ERTS_DBG_CHK_PROCS_RUNQ_PROC(runq, p); } static ERTS_INLINE int dequeue_process(ErtsRunQueue *runq, Process *p) { ErtsRunPrioQueue *rpq; int res = 1; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); ERTS_DBG_CHK_PROCS_RUNQ(runq); rpq = &runq->procs.prio[p->prio == PRIORITY_LOW ? PRIORITY_NORMAL : p->prio]; if (p->prev) { p->prev->next = p->next; } else if (rpq->first == p) { rpq->first = p->next; } else { res = 0; } if (p->next) { p->next->prev = p->prev; } else if (rpq->last == p) { rpq->last = p->prev; } else { ASSERT(res == 0); } if (res) { if (--runq->procs.prio_info[p->prio].len == 0) runq->flags &= ~(1 << p->prio); runq->procs.len--; runq->len--; #ifdef ERTS_SMP p->status_flags &= ~ERTS_PROC_SFLG_INRUNQ; #endif } ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(runq, p); return res; } /* schedule a process */ static ERTS_INLINE ErtsRunQueue * internal_add_to_runq(ErtsRunQueue *runq, Process *p) { Uint32 prev_status = p->status; ErtsRunQueue *add_runq; #ifdef ERTS_SMP ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq)); if (p->status_flags & ERTS_PROC_SFLG_INRUNQ) return NULL; else if (p->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) { ASSERT(ERTS_PROC_IS_EXITING(p) || p->rcount == 0); ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(runq, p); p->status_flags |= ERTS_PROC_SFLG_PENDADD2SCHEDQ; return NULL; } ASSERT(!p->scheduler_data); #endif ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(runq, p); #ifndef ERTS_SMP /* Never schedule a suspended process (ok in smp case) */ ASSERT(ERTS_PROC_IS_EXITING(p) || p->rcount == 0); add_runq = runq; #else ASSERT(!p->bound_runq || p->bound_runq == p->run_queue); if (p->bound_runq) { if (p->bound_runq == runq) add_runq = runq; else { add_runq = p->bound_runq; erts_smp_xrunq_lock(runq, add_runq); } } else { add_runq = erts_check_emigration_need(runq, p->prio); if (!add_runq) add_runq = runq; else /* Process emigrated */ p->run_queue = add_runq; } #endif /* Enqueue the process */ enqueue_process(add_runq, p); if ((erts_system_profile_flags.runnable_procs) && (prev_status == P_WAITING || prev_status == P_SUSPENDED)) { profile_runnable_proc(p, am_active); } if (add_runq != runq) erts_smp_runq_unlock(add_runq); return add_runq; } void erts_add_to_runq(Process *p) { ErtsRunQueue *notify_runq; ErtsRunQueue *runq = erts_get_runq_proc(p); erts_smp_runq_lock(runq); notify_runq = internal_add_to_runq(runq, p); erts_smp_runq_unlock(runq); smp_notify_inc_runq(notify_runq); } /* Possibly remove a scheduled process we need to suspend */ static int remove_proc_from_runq(ErtsRunQueue *rq, Process *p, int to_inactive) { int res; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); #ifdef ERTS_SMP if (p->status_flags & ERTS_PROC_SFLG_PENDADD2SCHEDQ) { p->status_flags &= ~ERTS_PROC_SFLG_PENDADD2SCHEDQ; ASSERT(!remove_proc_from_runq(rq, p, 0)); return 1; } #endif res = dequeue_process(rq, p); if (res && erts_system_profile_flags.runnable_procs && to_inactive) profile_runnable_proc(p, am_inactive); #ifdef ERTS_SMP ASSERT(!(p->status_flags & ERTS_PROC_SFLG_INRUNQ)); #endif return res; } #ifdef ERTS_SMP ErtsMigrateResult erts_proc_migrate(Process *p, ErtsProcLocks *plcks, ErtsRunQueue *from_rq, int *from_locked, ErtsRunQueue *to_rq, int *to_locked) { ERTS_SMP_LC_ASSERT(*plcks == erts_proc_lc_my_proc_locks(p)); ERTS_SMP_LC_ASSERT((ERTS_PROC_LOCK_STATUS & *plcks) || from_locked); ERTS_SMP_LC_CHK_RUNQ_LOCK(from_rq, *from_locked); ERTS_SMP_LC_CHK_RUNQ_LOCK(to_rq, *to_locked); ASSERT(!erts_common_run_queue); /* * If we have the lock on the run queue to migrate to, * check that it isn't suspended. If it is suspended, * we will refuse to migrate to it anyway. */ if (*to_locked && (to_rq->flags & ERTS_RUNQ_FLG_SUSPENDED)) return ERTS_MIGRATE_FAILED_RUNQ_SUSPENDED; /* We need status lock on process and locks on both run queues */ if (!(ERTS_PROC_LOCK_STATUS & *plcks)) { if (erts_smp_proc_trylock(p, ERTS_PROC_LOCK_STATUS) == EBUSY) { ErtsProcLocks lcks = *plcks; Eterm pid = p->id; Process *proc = *plcks ? p : NULL; if (*from_locked) { *from_locked = 0; erts_smp_runq_unlock(from_rq); } if (*to_locked) { *to_locked = 0; erts_smp_runq_unlock(to_rq); } proc = erts_pid2proc_opt(proc, lcks, pid, lcks|ERTS_PROC_LOCK_STATUS, ERTS_P2P_FLG_ALLOW_OTHER_X); if (!proc) { *plcks = 0; return ERTS_MIGRATE_FAILED_NOT_IN_RUNQ; } ASSERT(proc == p); } *plcks |= ERTS_PROC_LOCK_STATUS; } ASSERT(!p->bound_runq); ERTS_SMP_LC_CHK_RUNQ_LOCK(from_rq, *from_locked); ERTS_SMP_LC_CHK_RUNQ_LOCK(to_rq, *to_locked); if (p->run_queue != from_rq) return ERTS_MIGRATE_FAILED_RUNQ_CHANGED; if (!*from_locked || !*to_locked) { if (from_rq < to_rq) { if (!*to_locked) { if (!*from_locked) erts_smp_runq_lock(from_rq); erts_smp_runq_lock(to_rq); } else if (erts_smp_runq_trylock(from_rq) == EBUSY) { erts_smp_runq_unlock(to_rq); erts_smp_runq_lock(from_rq); erts_smp_runq_lock(to_rq); } } else { if (!*from_locked) { if (!*to_locked) erts_smp_runq_lock(to_rq); erts_smp_runq_lock(from_rq); } else if (erts_smp_runq_trylock(to_rq) == EBUSY) { erts_smp_runq_unlock(from_rq); erts_smp_runq_lock(to_rq); erts_smp_runq_lock(from_rq); } } *to_locked = *from_locked = 1; } ERTS_SMP_LC_CHK_RUNQ_LOCK(from_rq, *from_locked); ERTS_SMP_LC_CHK_RUNQ_LOCK(to_rq, *to_locked); /* Ok we now got all locks we need; do it... */ /* Refuse to migrate to a suspended run queue */ if (to_rq->flags & ERTS_RUNQ_FLG_SUSPENDED) return ERTS_MIGRATE_FAILED_RUNQ_SUSPENDED; if ((p->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) || !(p->status_flags & ERTS_PROC_SFLG_INRUNQ)) return ERTS_MIGRATE_FAILED_NOT_IN_RUNQ; dequeue_process(from_rq, p); p->run_queue = to_rq; enqueue_process(to_rq, p); return ERTS_MIGRATE_SUCCESS; } #endif /* ERTS_SMP */ Eterm erts_process_status(Process *c_p, ErtsProcLocks c_p_locks, Process *rp, Eterm rpid) { Eterm res = am_undefined; Process *p; if (rp) { ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(rp)); p = rp; } else { p = erts_pid2proc_opt(c_p, c_p_locks, rpid, ERTS_PROC_LOCK_STATUS, ERTS_P2P_FLG_ALLOW_OTHER_X); } if (p) { switch (p->status) { case P_RUNABLE: res = am_runnable; break; case P_WAITING: res = am_waiting; break; case P_RUNNING: res = am_running; break; case P_EXITING: res = am_exiting; break; case P_GARBING: res = am_garbage_collecting; break; case P_SUSPENDED: res = am_suspended; break; case P_FREE: /* We cannot look up a process in P_FREE... */ default: /* Not a valid status... */ erl_exit(1, "Bad status (%b32u) found for process %T\n", p->status, p->id); break; } #ifdef ERTS_SMP if (!rp && (p != c_p || !(ERTS_PROC_LOCK_STATUS & c_p_locks))) erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); } else { int i; ErtsSchedulerData *esdp; if (erts_common_run_queue) erts_smp_runq_lock(erts_common_run_queue); for (i = 0; i < erts_no_schedulers; i++) { esdp = ERTS_SCHEDULER_IX(i); if (!erts_common_run_queue) erts_smp_runq_lock(esdp->run_queue); if (esdp->free_process && esdp->free_process->id == rpid) { res = am_free; if (!erts_common_run_queue) erts_smp_runq_unlock(esdp->run_queue); break; } if (!erts_common_run_queue) erts_smp_runq_unlock(esdp->run_queue); } if (erts_common_run_queue) erts_smp_runq_unlock(erts_common_run_queue); #endif } return res; } /* ** Suspend a process ** If we are to suspend on a port the busy_port is the thing ** otherwise busy_port is NIL */ void erts_suspend(Process* process, ErtsProcLocks process_locks, Port *busy_port) { ErtsRunQueue *rq; ERTS_SMP_LC_ASSERT(process_locks == erts_proc_lc_my_proc_locks(process)); if (!(process_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_lock(process, ERTS_PROC_LOCK_STATUS); rq = erts_get_runq_proc(process); erts_smp_runq_lock(rq); suspend_process(rq, process); erts_smp_runq_unlock(rq); if (busy_port) erts_wake_process_later(busy_port, process); if (!(process_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(process, ERTS_PROC_LOCK_STATUS); } void erts_resume(Process* process, ErtsProcLocks process_locks) { ERTS_SMP_LC_ASSERT(process_locks == erts_proc_lc_my_proc_locks(process)); if (!(process_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_lock(process, ERTS_PROC_LOCK_STATUS); resume_process(process); if (!(process_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(process, ERTS_PROC_LOCK_STATUS); } int erts_resume_processes(ErtsProcList *plp) { int nresumed = 0; while (plp) { Process *proc; ErtsProcList *fplp; ASSERT(is_internal_pid(plp->pid)); proc = erts_pid2proc(NULL, 0, plp->pid, ERTS_PROC_LOCK_STATUS); if (proc) { if (proclist_same(plp, proc)) { resume_process(proc); nresumed++; } erts_smp_proc_unlock(proc, ERTS_PROC_LOCK_STATUS); } fplp = plp; plp = plp->next; proclist_destroy(fplp); } return nresumed; } Eterm erts_get_process_priority(Process *p) { ErtsRunQueue *rq; Eterm value; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); rq = erts_get_runq_proc(p); erts_smp_runq_lock(rq); switch(p->prio) { case PRIORITY_MAX: value = am_max; break; case PRIORITY_HIGH: value = am_high; break; case PRIORITY_NORMAL: value = am_normal; break; case PRIORITY_LOW: value = am_low; break; default: ASSERT(0); value = am_undefined; break; } erts_smp_runq_unlock(rq); return value; } Eterm erts_set_process_priority(Process *p, Eterm new_value) { ErtsRunQueue *rq; Eterm old_value; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); rq = erts_get_runq_proc(p); #ifdef ERTS_SMP ASSERT(!(p->status_flags & ERTS_PROC_SFLG_INRUNQ)); #endif erts_smp_runq_lock(rq); switch(p->prio) { case PRIORITY_MAX: old_value = am_max; break; case PRIORITY_HIGH: old_value = am_high; break; case PRIORITY_NORMAL: old_value = am_normal; break; case PRIORITY_LOW: old_value = am_low; break; default: ASSERT(0); old_value = am_undefined; break; } switch (new_value) { case am_max: p->prio = PRIORITY_MAX; break; case am_high: p->prio = PRIORITY_HIGH; break; case am_normal: p->prio = PRIORITY_NORMAL; break; case am_low: p->prio = PRIORITY_LOW; break; default: old_value = THE_NON_VALUE; break; } erts_smp_runq_unlock(rq); return old_value; } /* note that P_RUNNING is only set so that we don't try to remove ** running processes from the schedule queue if they exit - a running ** process not being in the schedule queue!! ** Schedule for up to INPUT_REDUCTIONS context switches, ** return 1 if more to do. */ /* * schedule() is called from BEAM (process_main()) or HiPE * (hipe_mode_switch()) when the current process is to be * replaced by a new process. 'calls' is the number of reduction * steps the current process consumed. * schedule() returns the new process, and the new process' * ->fcalls field is initialised with its allowable number of * reduction steps. * * When no process is runnable, or when sufficiently many reduction * steps have been made, schedule() calls erl_sys_schedule() to * schedule system-level activities. * * We use the same queue for normal and low prio processes. * We reschedule low prio processes a certain number of times * so that normal processes get to run more frequently. */ Process *schedule(Process *p, int calls) { ErtsRunQueue *rq; ErtsRunPrioQueue *rpq; erts_aint_t dt; ErtsSchedulerData *esdp; int context_reds; int fcalls; int input_reductions; int actual_reds; int reds; if (ERTS_USE_MODIFIED_TIMING()) { context_reds = ERTS_MODIFIED_TIMING_CONTEXT_REDS; input_reductions = ERTS_MODIFIED_TIMING_INPUT_REDS; } else { context_reds = CONTEXT_REDS; input_reductions = INPUT_REDUCTIONS; } ERTS_SMP_LC_ASSERT(!ERTS_LC_IS_BLOCKING); /* * Clean up after the process being scheduled out. */ if (!p) { /* NULL in the very first schedule() call */ esdp = erts_get_scheduler_data(); rq = erts_get_runq_current(esdp); ASSERT(esdp); fcalls = (int) erts_smp_atomic32_read_acqb(&function_calls); actual_reds = reds = 0; erts_smp_runq_lock(rq); } else { #ifdef ERTS_SMP ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); esdp = p->scheduler_data; ASSERT(esdp->current_process == p || esdp->free_process == p); #else esdp = erts_scheduler_data; ASSERT(esdp->current_process == p); #endif reds = actual_reds = calls - esdp->virtual_reds; if (reds < ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST) reds = ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST; esdp->virtual_reds = 0; fcalls = (int) erts_smp_atomic32_addtest(&function_calls, reds); ASSERT(esdp && esdp == erts_get_scheduler_data()); rq = erts_get_runq_current(esdp); p->reds += actual_reds; erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); if ((erts_system_profile_flags.runnable_procs) && (p->status == P_WAITING)) { profile_runnable_proc(p, am_inactive); } if (IS_TRACED(p)) { if (IS_TRACED_FL(p, F_TRACE_CALLS) && p->status != P_FREE) { erts_schedule_time_break(p, ERTS_BP_CALL_TIME_SCHEDULE_OUT); } switch (p->status) { case P_EXITING: if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_EXIT)) trace_sched(p, am_out_exiting); break; case P_FREE: if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_EXIT)) trace_sched(p, am_out_exited); break; default: if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED)) trace_sched(p, am_out); else if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_PROCS)) trace_virtual_sched(p, am_out); break; } } #ifdef ERTS_SMP if (ERTS_PROC_PENDING_EXIT(p)) { erts_handle_pending_exit(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); p->status_flags |= ERTS_PROC_SFLG_PENDADD2SCHEDQ; } if (p->pending_suspenders) { handle_pending_suspend(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); ASSERT(!(p->status_flags & ERTS_PROC_SFLG_PENDADD2SCHEDQ) || p->rcount == 0); } #endif erts_smp_runq_lock(rq); ERTS_PROC_REDUCTIONS_EXECUTED(rq, p->prio, reds, actual_reds); esdp->current_process = NULL; #ifdef ERTS_SMP p->scheduler_data = NULL; p->runq_flags &= ~ERTS_PROC_RUNQ_FLG_RUNNING; p->status_flags &= ~ERTS_PROC_SFLG_RUNNING; if (p->status_flags & ERTS_PROC_SFLG_PENDADD2SCHEDQ) { ErtsRunQueue *notify_runq; p->status_flags &= ~ERTS_PROC_SFLG_PENDADD2SCHEDQ; notify_runq = internal_add_to_runq(rq, p); if (notify_runq != rq) smp_notify_inc_runq(notify_runq); } #endif if (p->status == P_FREE) { #ifdef ERTS_SMP ASSERT(esdp->free_process == p); esdp->free_process = NULL; erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); erts_smp_proc_dec_refc(p); #else erts_free_proc(p); #endif } else { erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); } #ifdef ERTS_SMP { ErtsProcList *pnd_xtrs = rq->procs.pending_exiters; rq->procs.pending_exiters = NULL; if (pnd_xtrs) { erts_smp_runq_unlock(rq); handle_pending_exiters(pnd_xtrs); erts_smp_runq_lock(rq); } } ASSERT(!esdp->free_process); #endif ASSERT(!esdp->current_process); ERTS_SMP_CHK_NO_PROC_LOCKS; dt = erts_do_time_read_and_reset(); if (dt) { erts_smp_runq_unlock(rq); erts_bump_timer(dt); erts_smp_runq_lock(rq); } BM_STOP_TIMER(system); } ERTS_SMP_LC_ASSERT(!ERTS_LC_IS_BLOCKING); check_activities_to_run: { #ifdef ERTS_SMP if (!(rq->flags & ERTS_RUNQ_FLG_SHARED_RUNQ) && rq->check_balance_reds <= 0) { check_balance(rq); } ERTS_SMP_LC_ASSERT(!ERTS_LC_IS_BLOCKING); ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); if (rq->flags & ERTS_RUNQ_FLGS_IMMIGRATE_QMASK) immigrate(rq); continue_check_activities_to_run: if (rq->flags & (ERTS_RUNQ_FLG_SHARED_RUNQ | ERTS_RUNQ_FLG_CHK_CPU_BIND | ERTS_RUNQ_FLG_SUSPENDED)) { if ((rq->flags & ERTS_RUNQ_FLG_SUSPENDED) || (erts_smp_atomic32_read_acqb(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED)) { ASSERT(erts_smp_atomic32_read(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED); suspend_scheduler(esdp); } if ((rq->flags & ERTS_RUNQ_FLG_CHK_CPU_BIND) || erts_smp_atomic32_read_acqb(&esdp->chk_cpu_bind)) { erts_sched_check_cpu_bind(esdp); } } #if defined(ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK) \ || defined(ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK) { ErtsSchedulerSleepInfo *ssi = esdp->ssi; erts_aint32_t aux_work = erts_smp_atomic32_read(&ssi->aux_work); if (aux_work) { erts_smp_runq_unlock(rq); #ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK aux_work = blockable_aux_work(esdp, ssi, aux_work); #endif #ifdef ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK nonblockable_aux_work(esdp, ssi, aux_work); #endif erts_smp_runq_lock(rq); } } #endif erts_smp_chk_system_block(prepare_for_block, resume_after_block, (void *) rq); ERTS_SMP_LC_ASSERT(!ERTS_LC_IS_BLOCKING); ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); #endif ASSERT(rq->len == rq->procs.len + rq->ports.info.len); #ifndef ERTS_SMP if (rq->len == 0 && !rq->misc.start) goto do_sys_schedule; #else /* ERTS_SMP */ if (rq->len == 0 && !rq->misc.start) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); rq->wakeup_other = 0; rq->wakeup_other_reds = 0; empty_runq(rq); if (rq->flags & (ERTS_RUNQ_FLG_SHARED_RUNQ | ERTS_RUNQ_FLG_SUSPENDED)) { if ((rq->flags & ERTS_RUNQ_FLG_SUSPENDED) || (erts_smp_atomic32_read_acqb(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED)) { ASSERT(erts_smp_atomic32_read(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED); non_empty_runq(rq); goto continue_check_activities_to_run; } } else if (!(rq->flags & ERTS_RUNQ_FLG_INACTIVE)) { /* * Check for ERTS_RUNQ_FLG_SUSPENDED has to be done * after trying to steal a task. */ if (try_steal_task(rq) || (rq->flags & ERTS_RUNQ_FLG_SUSPENDED)) { non_empty_runq(rq); goto continue_check_activities_to_run; } } scheduler_wait(&fcalls, esdp, rq); non_empty_runq(rq); goto check_activities_to_run; } else #endif /* ERTS_SMP */ if (fcalls > input_reductions && prepare_for_sys_schedule()) { int runnable; #ifdef ERTS_SMP runnable = 1; #else do_sys_schedule: runnable = rq->len != 0; if (!runnable) sched_waiting_sys(esdp->no, rq); #endif /* * Schedule system-level activities. */ erts_smp_atomic32_set_relb(&function_calls, 0); fcalls = 0; ASSERT(!erts_port_task_have_outstanding_io_tasks()); #ifdef ERTS_SMP /* erts_sys_schedule_interrupt(0); */ #endif erts_smp_runq_unlock(rq); erl_sys_schedule(runnable); dt = erts_do_time_read_and_reset(); if (dt) erts_bump_timer(dt); #ifdef ERTS_SMP erts_smp_runq_lock(rq); clear_sys_scheduling(); goto continue_check_activities_to_run; #else if (!runnable) sched_active_sys(esdp->no, rq); goto check_activities_to_run; #endif } if (rq->misc.start) exec_misc_ops(rq); #ifdef ERTS_SMP { int wo_reds = rq->wakeup_other_reds; if (wo_reds) { if (rq->len < 2) { rq->wakeup_other -= ERTS_WAKEUP_OTHER_DEC*wo_reds; if (rq->wakeup_other < 0) rq->wakeup_other = 0; } else if (rq->wakeup_other < wakeup_other_limit) rq->wakeup_other += rq->len*wo_reds + ERTS_WAKEUP_OTHER_FIXED_INC; else { if (erts_common_run_queue) { if (erts_common_run_queue->waiting) wake_scheduler(erts_common_run_queue, 0, 1); } else if (erts_smp_atomic32_read_acqb(&no_empty_run_queues) != 0) { wake_scheduler_on_empty_runq(rq); rq->wakeup_other = 0; } rq->wakeup_other = 0; } } rq->wakeup_other_reds = 0; } #endif /* * Find a new port to run. */ if (rq->ports.info.len) { int have_outstanding_io; have_outstanding_io = erts_port_task_execute(rq, &esdp->current_port); if (have_outstanding_io && fcalls > 2*input_reductions) { /* * If we have performed more than 2*INPUT_REDUCTIONS since * last call to erl_sys_schedule() and we still haven't * handled all I/O tasks we stop running processes and * focus completely on ports. * * One could argue that this is a strange behavior. The * reason for doing it this way is that it is similar * to the behavior before port tasks were introduced. * We don't want to change the behavior too much, at * least not at the time of writing. This behavior * might change in the future. * * /rickard */ goto check_activities_to_run; } } /* * Find a new process to run. */ pick_next_process: ERTS_DBG_CHK_PROCS_RUNQ(rq); switch (rq->flags & ERTS_RUNQ_FLGS_PROCS_QMASK) { case MAX_BIT: case MAX_BIT|HIGH_BIT: case MAX_BIT|NORMAL_BIT: case MAX_BIT|LOW_BIT: case MAX_BIT|HIGH_BIT|NORMAL_BIT: case MAX_BIT|HIGH_BIT|LOW_BIT: case MAX_BIT|NORMAL_BIT|LOW_BIT: case MAX_BIT|HIGH_BIT|NORMAL_BIT|LOW_BIT: rpq = &rq->procs.prio[PRIORITY_MAX]; break; case HIGH_BIT: case HIGH_BIT|NORMAL_BIT: case HIGH_BIT|LOW_BIT: case HIGH_BIT|NORMAL_BIT|LOW_BIT: rpq = &rq->procs.prio[PRIORITY_HIGH]; break; case NORMAL_BIT: rpq = &rq->procs.prio[PRIORITY_NORMAL]; break; case LOW_BIT: rpq = &rq->procs.prio[PRIORITY_NORMAL]; break; case NORMAL_BIT|LOW_BIT: rpq = &rq->procs.prio[PRIORITY_NORMAL]; ASSERT(rpq->first != NULL); p = rpq->first; if (p->prio == PRIORITY_LOW) { if (p == rpq->last || p->skipped >= RESCHEDULE_LOW-1) p->skipped = 0; else { /* skip it */ p->skipped++; rpq->first = p->next; rpq->first->prev = NULL; rpq->last->next = p; p->prev = rpq->last; p->next = NULL; rpq->last = p; goto pick_next_process; } } break; case 0: /* No process at all */ default: ASSERT((rq->flags & ERTS_RUNQ_FLGS_PROCS_QMASK) == 0); ASSERT(rq->procs.len == 0); goto check_activities_to_run; } BM_START_TIMER(system); /* * Take the chosen process out of the queue. */ ASSERT(rpq->first); /* Wrong qmask in rq->flags? */ p = rpq->first; #ifdef ERTS_SMP ERTS_SMP_LC_ASSERT(rq == p->run_queue); #endif rpq->first = p->next; if (!rpq->first) rpq->last = NULL; else rpq->first->prev = NULL; p->next = p->prev = NULL; if (--rq->procs.prio_info[p->prio].len == 0) rq->flags &= ~(1 << p->prio); ASSERT(rq->procs.len > 0); rq->procs.len--; ASSERT(rq->len > 0); rq->len--; { Uint32 ee_flgs = (ERTS_RUNQ_FLG_EVACUATE(p->prio) | ERTS_RUNQ_FLG_EMIGRATE(p->prio)); if ((rq->flags & (ERTS_RUNQ_FLG_SUSPENDED|ee_flgs)) == ee_flgs) ERTS_UNSET_RUNQ_FLG_EVACUATE(rq->flags, p->prio); } ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(rq, p); rq->procs.context_switches++; esdp->current_process = p; #ifdef ERTS_SMP p->runq_flags |= ERTS_PROC_RUNQ_FLG_RUNNING; erts_smp_runq_unlock(rq); ERTS_SMP_CHK_NO_PROC_LOCKS; erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); if (erts_sched_stat.enabled) { UWord old = ERTS_PROC_SCHED_ID(p, (ERTS_PROC_LOCK_MAIN | ERTS_PROC_LOCK_STATUS), (UWord) esdp->no); int migrated = old && old != esdp->no; erts_smp_spin_lock(&erts_sched_stat.lock); erts_sched_stat.prio[p->prio].total_executed++; erts_sched_stat.prio[p->prio].executed++; if (migrated) { erts_sched_stat.prio[p->prio].total_migrated++; erts_sched_stat.prio[p->prio].migrated++; } erts_smp_spin_unlock(&erts_sched_stat.lock); } p->status_flags |= ERTS_PROC_SFLG_RUNNING; p->status_flags &= ~ERTS_PROC_SFLG_INRUNQ; if (ERTS_PROC_PENDING_EXIT(p)) { erts_handle_pending_exit(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); } ASSERT(!p->scheduler_data); p->scheduler_data = esdp; #endif ASSERT(p->status != P_SUSPENDED); /* Never run a suspended process */ ACTIVATE(p); reds = context_reds; if (IS_TRACED(p)) { switch (p->status) { case P_EXITING: if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_EXIT)) trace_sched(p, am_in_exiting); break; default: if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED)) trace_sched(p, am_in); else if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_PROCS)) trace_virtual_sched(p, am_in); break; } if (IS_TRACED_FL(p, F_TRACE_CALLS)) { erts_schedule_time_break(p, ERTS_BP_CALL_TIME_SCHEDULE_IN); } } if (p->status != P_EXITING) p->status = P_RUNNING; erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); #ifdef ERTS_SMP if (is_not_nil(p->tracer_proc)) erts_check_my_tracer_proc(p); #endif if (!ERTS_PROC_IS_EXITING(p) && ((FLAGS(p) & F_FORCE_GC) || (MSO(p).overhead > BIN_VHEAP_SZ(p)))) { reds -= erts_garbage_collect(p, 0, p->arg_reg, p->arity); if (reds < 0) { reds = 1; } } p->fcalls = reds; ASSERT(IS_ACTIVE(p)); ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); return p; } } void erts_sched_stat_modify(int what) { int ix; switch (what) { case ERTS_SCHED_STAT_MODIFY_ENABLE: erts_smp_block_system(0); erts_sched_stat.enabled = 1; erts_smp_release_system(); break; case ERTS_SCHED_STAT_MODIFY_DISABLE: erts_smp_block_system(0); erts_sched_stat.enabled = 1; erts_smp_release_system(); break; case ERTS_SCHED_STAT_MODIFY_CLEAR: erts_smp_spin_lock(&erts_sched_stat.lock); for (ix = 0; ix < ERTS_NO_PRIO_LEVELS; ix++) { erts_sched_stat.prio[ix].total_executed = 0; erts_sched_stat.prio[ix].executed = 0; erts_sched_stat.prio[ix].total_migrated = 0; erts_sched_stat.prio[ix].migrated = 0; } erts_smp_spin_unlock(&erts_sched_stat.lock); break; } } Eterm erts_sched_stat_term(Process *p, int total) { Uint sz; Uint *hp; Eterm prio[ERTS_NO_PRIO_LEVELS]; Uint executed[ERTS_NO_PRIO_LEVELS]; Uint migrated[ERTS_NO_PRIO_LEVELS]; erts_smp_spin_lock(&erts_sched_stat.lock); if (total) { int i; for (i = 0; i < ERTS_NO_PRIO_LEVELS; i++) { prio[i] = erts_sched_stat.prio[i].name; executed[i] = erts_sched_stat.prio[i].total_executed; migrated[i] = erts_sched_stat.prio[i].total_migrated; } } else { int i; for (i = 0; i < ERTS_NO_PRIO_LEVELS; i++) { prio[i] = erts_sched_stat.prio[i].name; executed[i] = erts_sched_stat.prio[i].executed; erts_sched_stat.prio[i].executed = 0; migrated[i] = erts_sched_stat.prio[i].migrated; erts_sched_stat.prio[i].migrated = 0; } } erts_smp_spin_unlock(&erts_sched_stat.lock); sz = 0; (void) erts_bld_atom_2uint_3tup_list(NULL, &sz, ERTS_NO_PRIO_LEVELS, prio, executed, migrated); hp = HAlloc(p, sz); return erts_bld_atom_2uint_3tup_list(&hp, NULL, ERTS_NO_PRIO_LEVELS, prio, executed, migrated); } /* * Scheduling of misc stuff */ void erts_schedule_misc_op(void (*func)(void *), void *arg) { ErtsRunQueue *rq = erts_get_runq_current(NULL); ErtsMiscOpList *molp = misc_op_list_alloc(); if (!rq) { /* * This can only happen when the sys msg dispatcher * thread schedules misc ops (this happens *very* * seldom; only when trace drivers are unloaded). */ rq = ERTS_RUNQ_IX(0); } erts_smp_runq_lock(rq); while (rq->misc.evac_runq) { ErtsRunQueue *tmp_rq = rq->misc.evac_runq; erts_smp_runq_unlock(rq); rq = tmp_rq; erts_smp_runq_lock(rq); } ASSERT(!(rq->flags & ERTS_RUNQ_FLG_SUSPENDED)); molp->next = NULL; molp->func = func; molp->arg = arg; if (rq->misc.end) rq->misc.end->next = molp; else rq->misc.start = molp; rq->misc.end = molp; erts_smp_runq_unlock(rq); smp_notify_inc_runq(rq); } static void exec_misc_ops(ErtsRunQueue *rq) { int i; ErtsMiscOpList *molp = rq->misc.start; ErtsMiscOpList *tmp_molp = molp; for (i = 0; i < ERTS_MAX_MISC_OPS-1; i++) { if (!tmp_molp) goto mtq; tmp_molp = tmp_molp->next; } if (!tmp_molp) { mtq: rq->misc.start = NULL; rq->misc.end = NULL; } else { rq->misc.start = tmp_molp->next; tmp_molp->next = NULL; if (!rq->misc.start) rq->misc.end = NULL; } erts_smp_runq_unlock(rq); while (molp) { tmp_molp = molp; (*molp->func)(molp->arg); molp = molp->next; misc_op_list_free(tmp_molp); } erts_smp_runq_lock(rq); } Uint erts_get_total_context_switches(void) { Uint res = 0; ERTS_ATOMIC_FOREACH_RUNQ(rq, res += rq->procs.context_switches); return res; } void erts_get_total_reductions(Uint *redsp, Uint *diffp) { Uint reds = 0; ERTS_ATOMIC_FOREACH_RUNQ_X(rq, reds += rq->procs.reductions, if (redsp) *redsp = reds; if (diffp) *diffp = reds - last_reductions; last_reductions = reds); } void erts_get_exact_total_reductions(Process *c_p, Uint *redsp, Uint *diffp) { Uint reds = erts_current_reductions(c_p, c_p); int ix; erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN); /* * Wait for other schedulers to schedule out their processes * and update 'reductions'. */ erts_smp_block_system(0); for (reds = 0, ix = 0; ix < erts_no_run_queues; ix++) reds += ERTS_RUNQ_IX(ix)->procs.reductions; if (redsp) *redsp = reds; if (diffp) *diffp = reds - last_exact_reductions; last_exact_reductions = reds; erts_smp_release_system(); erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_MAIN); } /* * erts_test_next_pid() is only used for testing. */ Sint erts_test_next_pid(int set, Uint next) { Sint res; Sint p_prev; erts_smp_mtx_lock(&proc_tab_mtx); if (!set) { res = p_next < 0 ? -1 : (p_serial << p_serial_shift | p_next); } else { p_serial = (Sint) ((next >> p_serial_shift) & p_serial_mask); p_next = (Sint) (erts_process_tab_index_mask & next); if (p_next >= erts_max_processes) { p_next = 0; p_serial++; p_serial &= p_serial_mask; } p_prev = p_next; do { if (!process_tab[p_next]) break; p_next++; if(p_next >= erts_max_processes) { p_next = 0; p_serial++; p_serial &= p_serial_mask; } } while (p_prev != p_next); res = process_tab[p_next] ? -1 : (p_serial << p_serial_shift | p_next); } erts_smp_mtx_unlock(&proc_tab_mtx); return res; } Uint erts_process_count(void) { erts_aint32_t res = erts_smp_atomic32_read(&process_count); ASSERT(res >= 0); return (Uint) res; } void erts_free_proc(Process *p) { #if defined(ERTS_ENABLE_LOCK_COUNT) && defined(ERTS_SMP) erts_lcnt_proc_lock_destroy(p); #endif erts_free(ERTS_ALC_T_PROC, (void *) p); } /* ** Allocate process and find out where to place next process. */ static Process* alloc_process(void) { #ifdef ERTS_SMP erts_pix_lock_t *pix_lock; #endif Process* p; int p_prev; erts_smp_mtx_lock(&proc_tab_mtx); if (p_next == -1) { p = NULL; goto error; /* Process table full! */ } p = (Process*) erts_alloc_fnf(ERTS_ALC_T_PROC, sizeof(Process)); if (!p) goto error; /* ENOMEM */ p_last = p_next; erts_get_emu_time(&p->started); #ifdef ERTS_SMP pix_lock = ERTS_PIX2PIXLOCK(p_next); erts_pix_lock(pix_lock); #endif ASSERT(!process_tab[p_next]); process_tab[p_next] = p; erts_smp_atomic32_inc(&process_count); p->id = make_internal_pid(p_serial << p_serial_shift | p_next); if (p->id == ERTS_INVALID_PID) { /* Do not use the invalid pid; change serial */ p_serial++; p_serial &= p_serial_mask; p->id = make_internal_pid(p_serial << p_serial_shift | p_next); ASSERT(p->id != ERTS_INVALID_PID); } ASSERT(internal_pid_serial(p->id) <= (erts_use_r9_pids_ports ? ERTS_MAX_PID_R9_SERIAL : ERTS_MAX_PID_SERIAL)); #ifdef ERTS_SMP erts_proc_lock_init(p); /* All locks locked */ erts_pix_unlock(pix_lock); #endif p->rstatus = P_FREE; p->rcount = 0; /* * set p_next to the next available slot */ p_prev = p_next; while (1) { p_next++; if(p_next >= erts_max_processes) { p_serial++; p_serial &= p_serial_mask; p_next = 0; } if (p_prev == p_next) { p_next = -1; break; /* Table full! */ } if (!process_tab[p_next]) break; /* found a free slot */ } error: erts_smp_mtx_unlock(&proc_tab_mtx); return p; } Eterm erl_create_process(Process* parent, /* Parent of process (default group leader). */ Eterm mod, /* Tagged atom for module. */ Eterm func, /* Tagged atom for function. */ Eterm args, /* Arguments for function (must be well-formed list). */ ErlSpawnOpts* so) /* Options for spawn. */ { ErtsRunQueue *rq, *notify_runq; Process *p; Sint arity; /* Number of arguments. */ #ifndef HYBRID Uint arg_size; /* Size of arguments. */ #endif Uint sz; /* Needed words on heap. */ Uint heap_need; /* Size needed on heap. */ Eterm res = THE_NON_VALUE; #ifdef ERTS_SMP erts_smp_proc_lock(parent, ERTS_PROC_LOCKS_ALL_MINOR); #endif #ifdef HYBRID /* * Copy the arguments to the global heap * Since global GC might occur we want to do this before adding the * new process to the process_tab. */ BM_SWAP_TIMER(system,copy); LAZY_COPY(parent,args); BM_SWAP_TIMER(copy,system); heap_need = 0; #endif /* HYBRID */ /* * Check for errors. */ if (is_not_atom(mod) || is_not_atom(func) || ((arity = list_length(args)) < 0)) { so->error_code = BADARG; goto error; } p = alloc_process(); /* All proc locks are locked by this thread on success */ if (!p) { erts_send_error_to_logger_str(parent->group_leader, "Too many processes\n"); so->error_code = SYSTEM_LIMIT; goto error; } processes_busy++; BM_COUNT(processes_spawned); #ifndef HYBRID BM_SWAP_TIMER(system,size); arg_size = size_object(args); BM_SWAP_TIMER(size,system); heap_need = arg_size; #endif p->flags = erts_default_process_flags; /* Scheduler queue mutex should be locked when changeing * prio. In this case we don't have to lock it, since * noone except us has access to the process. */ if (so->flags & SPO_USE_ARGS) { p->min_heap_size = so->min_heap_size; p->min_vheap_size = so->min_vheap_size; p->prio = so->priority; p->max_gen_gcs = so->max_gen_gcs; } else { p->min_heap_size = H_MIN_SIZE; p->min_vheap_size = BIN_VH_MIN_SIZE; p->prio = PRIORITY_NORMAL; p->max_gen_gcs = (Uint16) erts_smp_atomic32_read(&erts_max_gen_gcs); } p->skipped = 0; ASSERT(p->min_heap_size == erts_next_heap_size(p->min_heap_size, 0)); p->initial[INITIAL_MOD] = mod; p->initial[INITIAL_FUN] = func; p->initial[INITIAL_ARI] = (Uint) arity; /* * Must initialize binary lists here before copying binaries to process. */ p->off_heap.first = NULL; p->off_heap.overhead = 0; heap_need += IS_CONST(parent->group_leader) ? 0 : NC_HEAP_SIZE(parent->group_leader); if (heap_need < p->min_heap_size) { sz = heap_need = p->min_heap_size; } else { sz = erts_next_heap_size(heap_need, 0); } #ifdef HIPE hipe_init_process(&p->hipe); #ifdef ERTS_SMP hipe_init_process_smp(&p->hipe_smp); #endif #endif p->heap = (Eterm *) ERTS_HEAP_ALLOC(ERTS_ALC_T_HEAP, sizeof(Eterm)*sz); p->old_hend = p->old_htop = p->old_heap = NULL; p->high_water = p->heap; #ifdef INCREMENTAL p->scan_top = p->high_water; #endif p->gen_gcs = 0; p->stop = p->hend = p->heap + sz; p->htop = p->heap; p->heap_sz = sz; p->catches = 0; p->bin_vheap_sz = p->min_vheap_size; p->bin_old_vheap_sz = p->min_vheap_size; p->bin_old_vheap = 0; p->bin_vheap_mature = 0; /* No need to initialize p->fcalls. */ p->current = p->initial+INITIAL_MOD; p->i = (BeamInstr *) beam_apply; p->cp = (BeamInstr *) beam_apply+1; p->arg_reg = p->def_arg_reg; p->max_arg_reg = sizeof(p->def_arg_reg)/sizeof(p->def_arg_reg[0]); p->arg_reg[0] = mod; p->arg_reg[1] = func; BM_STOP_TIMER(system); BM_MESSAGE(args,p,parent); BM_START_TIMER(system); #ifdef HYBRID p->arg_reg[2] = args; #ifdef INCREMENTAL p->active = 0; if (ptr_val(args) >= inc_fromspc && ptr_val(args) < inc_fromend) INC_ACTIVATE(p); #endif #else BM_SWAP_TIMER(system,copy); p->arg_reg[2] = copy_struct(args, arg_size, &p->htop, &p->off_heap); BM_MESSAGE_COPIED(arg_size); BM_SWAP_TIMER(copy,system); #endif p->arity = 3; p->fvalue = NIL; p->freason = EXC_NULL; p->ftrace = NIL; p->reds = 0; #ifdef ERTS_SMP p->u.ptimer = NULL; #else sys_memset(&p->u.tm, 0, sizeof(ErlTimer)); #endif p->reg = NULL; p->nlinks = NULL; p->monitors = NULL; p->nodes_monitors = NULL; p->suspend_monitors = NULL; ASSERT(is_pid(parent->group_leader)); if (parent->group_leader == ERTS_INVALID_PID) p->group_leader = p->id; else { /* Needs to be done after the heap has been set up */ p->group_leader = IS_CONST(parent->group_leader) ? parent->group_leader : STORE_NC(&p->htop, &p->off_heap, parent->group_leader); } erts_get_default_tracing(&p->trace_flags, &p->tracer_proc); p->msg.first = NULL; p->msg.last = &p->msg.first; p->msg.save = &p->msg.first; p->msg.len = 0; #ifdef ERTS_SMP p->msg_inq.first = NULL; p->msg_inq.last = &p->msg_inq.first; p->msg_inq.len = 0; p->bound_runq = NULL; #endif p->bif_timers = NULL; p->mbuf = NULL; p->mbuf_sz = 0; p->psd = NULL; p->dictionary = NULL; p->seq_trace_lastcnt = 0; p->seq_trace_clock = 0; SEQ_TRACE_TOKEN(p) = NIL; p->parent = parent->id == ERTS_INVALID_PID ? NIL : parent->id; #ifdef HYBRID p->rrma = NULL; p->rrsrc = NULL; p->nrr = 0; p->rrsz = 0; #endif INIT_HOLE_CHECK(p); #ifdef DEBUG p->last_old_htop = NULL; #endif if (IS_TRACED(parent)) { if (parent->trace_flags & F_TRACE_SOS) { p->trace_flags |= (parent->trace_flags & TRACEE_FLAGS); p->tracer_proc = parent->tracer_proc; } if (ARE_TRACE_FLAGS_ON(parent, F_TRACE_PROCS)) { trace_proc_spawn(parent, p->id, mod, func, args); } if (parent->trace_flags & F_TRACE_SOS1) { /* Overrides TRACE_CHILDREN */ p->trace_flags |= (parent->trace_flags & TRACEE_FLAGS); p->tracer_proc = parent->tracer_proc; p->trace_flags &= ~(F_TRACE_SOS1 | F_TRACE_SOS); parent->trace_flags &= ~(F_TRACE_SOS1 | F_TRACE_SOS); } } /* * Check if this process should be initially linked to its parent. */ if (so->flags & SPO_LINK) { #ifdef DEBUG int ret; #endif if (IS_TRACED_FL(parent, F_TRACE_PROCS)) { trace_proc(parent, parent, am_link, p->id); } #ifdef DEBUG ret = erts_add_link(&(parent->nlinks), LINK_PID, p->id); ASSERT(ret == 0); ret = erts_add_link(&(p->nlinks), LINK_PID, parent->id); ASSERT(ret == 0); #else erts_add_link(&(parent->nlinks), LINK_PID, p->id); erts_add_link(&(p->nlinks), LINK_PID, parent->id); #endif if (IS_TRACED(parent)) { if (parent->trace_flags & (F_TRACE_SOL|F_TRACE_SOL1)) { p->trace_flags |= (parent->trace_flags & TRACEE_FLAGS); p->tracer_proc = parent->tracer_proc; /* maybe steal */ if (parent->trace_flags & F_TRACE_SOL1) { /* maybe override */ p ->trace_flags &= ~(F_TRACE_SOL1 | F_TRACE_SOL); parent->trace_flags &= ~(F_TRACE_SOL1 | F_TRACE_SOL); } } } } /* * Test whether this process should be initially monitored by its parent. */ if (so->flags & SPO_MONITOR) { Eterm mref; mref = erts_make_ref(parent); erts_add_monitor(&(parent->monitors), MON_ORIGIN, mref, p->id, NIL); erts_add_monitor(&(p->monitors), MON_TARGET, mref, parent->id, NIL); so->mref = mref; } #ifdef HYBRID /* * Add process to the array of active processes. */ ACTIVATE(p); p->active_index = erts_num_active_procs++; erts_active_procs[p->active_index] = p; #endif #ifdef ERTS_SMP p->scheduler_data = NULL; p->is_exiting = 0; p->status_flags = 0; p->runq_flags = 0; p->suspendee = NIL; p->pending_suspenders = NULL; p->pending_exit.reason = THE_NON_VALUE; p->pending_exit.bp = NULL; #endif #if !defined(NO_FPE_SIGNALS) p->fp_exception = 0; #endif /* * Schedule process for execution. */ if (!((so->flags & SPO_USE_ARGS) && so->scheduler)) rq = erts_get_runq_proc(parent); else { int ix = so->scheduler-1; ASSERT(0 <= ix && ix < erts_no_run_queues); rq = ERTS_RUNQ_IX(ix); p->bound_runq = rq; } erts_smp_runq_lock(rq); #ifdef ERTS_SMP p->run_queue = rq; #endif p->status = P_WAITING; notify_runq = internal_add_to_runq(rq, p); erts_smp_runq_unlock(rq); smp_notify_inc_runq(notify_runq); res = p->id; erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); VERBOSE(DEBUG_PROCESSES, ("Created a new process: %T\n",p->id)); error: erts_smp_proc_unlock(parent, ERTS_PROC_LOCKS_ALL_MINOR); return res; } /* * Initiates a pseudo process that can be used * for arithmetic BIFs. */ void erts_init_empty_process(Process *p) { p->htop = NULL; p->stop = NULL; p->hend = NULL; p->heap = NULL; p->gen_gcs = 0; p->max_gen_gcs = 0; p->min_heap_size = 0; p->min_vheap_size = 0; p->status = P_RUNABLE; p->gcstatus = P_RUNABLE; p->rstatus = P_RUNABLE; p->rcount = 0; p->id = ERTS_INVALID_PID; p->prio = PRIORITY_NORMAL; p->reds = 0; p->tracer_proc = NIL; p->trace_flags = F_INITIAL_TRACE_FLAGS; p->group_leader = ERTS_INVALID_PID; p->flags = 0; p->fvalue = NIL; p->freason = EXC_NULL; p->ftrace = NIL; p->fcalls = 0; p->bin_vheap_sz = BIN_VH_MIN_SIZE; p->bin_old_vheap_sz = BIN_VH_MIN_SIZE; p->bin_old_vheap = 0; p->bin_vheap_mature = 0; #ifdef ERTS_SMP p->u.ptimer = NULL; p->bound_runq = NULL; #else memset(&(p->u.tm), 0, sizeof(ErlTimer)); #endif p->next = NULL; p->off_heap.first = NULL; p->off_heap.overhead = 0; p->reg = NULL; p->heap_sz = 0; p->high_water = NULL; #ifdef INCREMENTAL p->scan_top = NULL; #endif p->old_hend = NULL; p->old_htop = NULL; p->old_heap = NULL; p->mbuf = NULL; p->mbuf_sz = 0; p->psd = NULL; p->monitors = NULL; p->nlinks = NULL; /* List of links */ p->nodes_monitors = NULL; p->suspend_monitors = NULL; p->msg.first = NULL; p->msg.last = &p->msg.first; p->msg.save = &p->msg.first; p->msg.len = 0; p->bif_timers = NULL; p->dictionary = NULL; p->seq_trace_clock = 0; p->seq_trace_lastcnt = 0; p->seq_trace_token = NIL; p->initial[0] = 0; p->initial[1] = 0; p->initial[2] = 0; p->catches = 0; p->cp = NULL; p->i = NULL; p->current = NULL; /* * Saved x registers. */ p->arity = 0; p->arg_reg = NULL; p->max_arg_reg = 0; p->def_arg_reg[0] = 0; p->def_arg_reg[1] = 0; p->def_arg_reg[2] = 0; p->def_arg_reg[3] = 0; p->def_arg_reg[4] = 0; p->def_arg_reg[5] = 0; p->parent = NIL; p->started.tv_sec = 0; p->started.tv_usec = 0; #ifdef HIPE hipe_init_process(&p->hipe); #ifdef ERTS_SMP hipe_init_process_smp(&p->hipe_smp); #endif #endif ACTIVATE(p); #ifdef HYBRID p->rrma = NULL; p->rrsrc = NULL; p->nrr = 0; p->rrsz = 0; #endif INIT_HOLE_CHECK(p); #ifdef DEBUG p->last_old_htop = NULL; #endif #ifdef ERTS_SMP p->scheduler_data = NULL; p->is_exiting = 0; p->status_flags = 0; p->runq_flags = 0; p->msg_inq.first = NULL; p->msg_inq.last = &p->msg_inq.first; p->msg_inq.len = 0; p->suspendee = NIL; p->pending_suspenders = NULL; p->pending_exit.reason = THE_NON_VALUE; p->pending_exit.bp = NULL; erts_proc_lock_init(p); erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); p->run_queue = ERTS_RUNQ_IX(0); #endif #if !defined(NO_FPE_SIGNALS) p->fp_exception = 0; #endif } #ifdef DEBUG void erts_debug_verify_clean_empty_process(Process* p) { /* Things that erts_cleanup_empty_process() will *not* cleanup... */ ASSERT(p->htop == NULL); ASSERT(p->stop == NULL); ASSERT(p->hend == NULL); ASSERT(p->heap == NULL); ASSERT(p->id == ERTS_INVALID_PID); ASSERT(p->tracer_proc == NIL); ASSERT(p->trace_flags == F_INITIAL_TRACE_FLAGS); ASSERT(p->group_leader == ERTS_INVALID_PID); ASSERT(p->next == NULL); ASSERT(p->reg == NULL); ASSERT(p->heap_sz == 0); ASSERT(p->high_water == NULL); #ifdef INCREMENTAL ASSERT(p->scan_top == NULL); #endif ASSERT(p->old_hend == NULL); ASSERT(p->old_htop == NULL); ASSERT(p->old_heap == NULL); ASSERT(p->monitors == NULL); ASSERT(p->nlinks == NULL); ASSERT(p->nodes_monitors == NULL); ASSERT(p->suspend_monitors == NULL); ASSERT(p->msg.first == NULL); ASSERT(p->msg.len == 0); ASSERT(p->bif_timers == NULL); ASSERT(p->dictionary == NULL); ASSERT(p->catches == 0); ASSERT(p->cp == NULL); ASSERT(p->i == NULL); ASSERT(p->current == NULL); ASSERT(p->parent == NIL); #ifdef ERTS_SMP ASSERT(p->msg_inq.first == NULL); ASSERT(p->msg_inq.len == 0); ASSERT(p->suspendee == NIL); ASSERT(p->pending_suspenders == NULL); ASSERT(p->pending_exit.reason == THE_NON_VALUE); ASSERT(p->pending_exit.bp == NULL); #endif /* Thing that erts_cleanup_empty_process() cleans up */ ASSERT(p->off_heap.first == NULL); ASSERT(p->off_heap.overhead == 0); ASSERT(p->mbuf == NULL); } #endif void erts_cleanup_empty_process(Process* p) { /* We only check fields that are known to be used... */ erts_cleanup_offheap(&p->off_heap); p->off_heap.first = NULL; p->off_heap.overhead = 0; if (p->mbuf != NULL) { free_message_buffer(p->mbuf); p->mbuf = NULL; } #if defined(ERTS_ENABLE_LOCK_COUNT) && defined(ERTS_SMP) erts_lcnt_proc_lock_destroy(p); #endif #ifdef DEBUG erts_debug_verify_clean_empty_process(p); #endif } /* * p must be the currently executing process. */ static void delete_process(Process* p) { ErlMessage* mp; VERBOSE(DEBUG_PROCESSES, ("Removing process: %T\n",p->id)); /* Cleanup psd */ if (p->psd) erts_free(ERTS_ALC_T_PSD, p->psd); /* Clean binaries and funs */ erts_cleanup_offheap(&p->off_heap); /* * The mso list should not be used anymore, but if it is, make sure that * we'll notice. */ p->off_heap.first = (void *) 0x8DEFFACD; if (p->arg_reg != p->def_arg_reg) { erts_free(ERTS_ALC_T_ARG_REG, p->arg_reg); } /* * Release heaps. Clobber contents in DEBUG build. */ #ifdef DEBUG sys_memset(p->heap, DEBUG_BAD_BYTE, p->heap_sz*sizeof(Eterm)); #endif #ifdef HIPE hipe_delete_process(&p->hipe); #endif ERTS_HEAP_FREE(ERTS_ALC_T_HEAP, (void*) p->heap, p->heap_sz*sizeof(Eterm)); if (p->old_heap != NULL) { #ifdef DEBUG sys_memset(p->old_heap, DEBUG_BAD_BYTE, (p->old_hend-p->old_heap)*sizeof(Eterm)); #endif ERTS_HEAP_FREE(ERTS_ALC_T_OLD_HEAP, p->old_heap, (p->old_hend-p->old_heap)*sizeof(Eterm)); } /* * Free all pending message buffers. */ if (p->mbuf != NULL) { free_message_buffer(p->mbuf); } erts_erase_dicts(p); /* free all pending messages */ mp = p->msg.first; while(mp != NULL) { ErlMessage* next_mp = mp->next; if (mp->data.attached) { if (is_value(mp->m[0])) free_message_buffer(mp->data.heap_frag); else { if (is_not_nil(mp->m[1])) { ErlHeapFragment *heap_frag; heap_frag = (ErlHeapFragment *) mp->data.dist_ext->ext_endp; erts_cleanup_offheap(&heap_frag->off_heap); } erts_free_dist_ext_copy(mp->data.dist_ext); } } free_message(mp); mp = next_mp; } ASSERT(!p->monitors); ASSERT(!p->nlinks); ASSERT(!p->nodes_monitors); ASSERT(!p->suspend_monitors); p->fvalue = NIL; #ifdef HYBRID erts_active_procs[p->active_index] = erts_active_procs[--erts_num_active_procs]; erts_active_procs[p->active_index]->active_index = p->active_index; #ifdef INCREMENTAL if (INC_IS_ACTIVE(p)) INC_DEACTIVATE(p); #endif if (p->rrma != NULL) { erts_free(ERTS_ALC_T_ROOTSET,p->rrma); erts_free(ERTS_ALC_T_ROOTSET,p->rrsrc); } #endif } static ERTS_INLINE void set_proc_exiting(Process *p, Eterm reason, ErlHeapFragment *bp) { #ifdef ERTS_SMP erts_pix_lock_t *pix_lock = ERTS_PID2PIXLOCK(p->id); ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(p) == ERTS_PROC_LOCKS_ALL); /* * You are required to have all proc locks and the pix lock when going * to status P_EXITING. This makes it is enough to take any lock when * looking up a process (pid2proc()) to prevent the looked up process * from exiting until the lock has been released. */ erts_pix_lock(pix_lock); p->is_exiting = 1; #endif p->status = P_EXITING; #ifdef ERTS_SMP erts_pix_unlock(pix_lock); #endif p->fvalue = reason; if (bp) erts_link_mbuf_to_proc(p, bp); /* * We used to set freason to EXC_EXIT here, but there is no need to * save the stack trace since this process irreversibly is going to * exit. */ p->freason = EXTAG_EXIT; KILL_CATCHES(p); cancel_timer(p); p->i = (BeamInstr *) beam_exit; } #ifdef ERTS_SMP void erts_handle_pending_exit(Process *c_p, ErtsProcLocks locks) { ErtsProcLocks xlocks; ASSERT(is_value(c_p->pending_exit.reason)); ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) == locks); ERTS_SMP_LC_ASSERT(locks & ERTS_PROC_LOCK_MAIN); ERTS_SMP_LC_ASSERT(c_p->status != P_EXITING); ERTS_SMP_LC_ASSERT(c_p->status != P_FREE); /* Ensure that all locks on c_p are locked before proceeding... */ if (locks == ERTS_PROC_LOCKS_ALL) xlocks = 0; else { xlocks = ~locks & ERTS_PROC_LOCKS_ALL; if (erts_smp_proc_trylock(c_p, xlocks) == EBUSY) { erts_smp_proc_unlock(c_p, locks & ~ERTS_PROC_LOCK_MAIN); erts_smp_proc_lock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); } } set_proc_exiting(c_p, c_p->pending_exit.reason, c_p->pending_exit.bp); c_p->pending_exit.reason = THE_NON_VALUE; c_p->pending_exit.bp = NULL; if (xlocks) erts_smp_proc_unlock(c_p, xlocks); } static void handle_pending_exiters(ErtsProcList *pnd_xtrs) { ErtsProcList *plp = pnd_xtrs; ErtsProcList *free_plp; while (plp) { Process *p = erts_pid2proc(NULL, 0, plp->pid, ERTS_PROC_LOCKS_ALL); if (p) { if (proclist_same(plp, p) && !(p->status_flags & ERTS_PROC_SFLG_RUNNING)) { ASSERT(p->status_flags & ERTS_PROC_SFLG_INRUNQ); ASSERT(ERTS_PROC_PENDING_EXIT(p)); erts_handle_pending_exit(p, ERTS_PROC_LOCKS_ALL); } erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); } free_plp = plp; plp = plp->next; proclist_destroy(free_plp); } } static void save_pending_exiter(Process *p) { ErtsProcList *plp; ErtsRunQueue *rq; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); rq = erts_get_runq_current(NULL); plp = proclist_create(p); erts_smp_runq_lock(rq); plp->next = rq->procs.pending_exiters; rq->procs.pending_exiters = plp; erts_smp_runq_unlock(rq); } #endif /* * This function delivers an EXIT message to a process * which is trapping EXITs. */ static ERTS_INLINE void send_exit_message(Process *to, ErtsProcLocks *to_locksp, Eterm exit_term, Uint term_size, Eterm token) { if (token == NIL) { Eterm* hp; Eterm mess; ErlHeapFragment* bp; ErlOffHeap *ohp; hp = erts_alloc_message_heap(term_size, &bp, &ohp, to, to_locksp); mess = copy_struct(exit_term, term_size, &hp, ohp); erts_queue_message(to, to_locksp, bp, mess, NIL); } else { ErlHeapFragment* bp; Eterm* hp; Eterm mess; Eterm temp_token; Uint sz_token; ASSERT(is_tuple(token)); sz_token = size_object(token); bp = new_message_buffer(term_size+sz_token); hp = bp->mem; mess = copy_struct(exit_term, term_size, &hp, &bp->off_heap); /* the trace token must in this case be updated by the caller */ seq_trace_output(token, mess, SEQ_TRACE_SEND, to->id, NULL); temp_token = copy_struct(token, sz_token, &hp, &bp->off_heap); erts_queue_message(to, to_locksp, bp, mess, temp_token); } } /* * * *** Exit signal behavior *** * * Exit signals are asynchronous (truly asynchronous in the * SMP emulator). When the signal is received the receiver receives an * 'EXIT' message if it is trapping exits; otherwise, it will either * ignore the signal if the exit reason is normal, or go into an * exiting state (status P_EXITING). When a process has gone into the * exiting state it will not execute any more Erlang code, but it might * take a while before it actually exits. The exit signal is being * received when the 'EXIT' message is put in the message queue, the * signal is dropped, or when it changes state into exiting. The time it * is in the exiting state before actually exiting is undefined (it * might take a really long time under certain conditions). The * receiver of the exit signal does not break links or trigger monitors * until it actually exits. * * Exit signals and other signals, e.g. messages, have to be received * by a receiver in the same order as sent by a sender. * * * * Exit signal implementation in the SMP emulator: * * If the receiver is trapping exits, the signal is transformed * into an 'EXIT' message and sent as a normal message, if the * reason is normal the signal is dropped; otherwise, the process * is determined to be exited. The interesting case is when the * process is to be exited and this is what is described below. * * If it is possible, the receiver is set in the exiting state straight * away and we are done; otherwise, the sender places the exit reason * in the pending_exit field of the process struct and if necessary * adds the receiver to the run queue. It is typically not possible * to set a scheduled process or a process which we cannot get all locks * on without releasing locks on it in an exiting state straight away. * * The receiver will poll the pending_exit field when it reach certain * places during it's execution. When it discovers the pending exit * it will change state into the exiting state. If the receiver wasn't * scheduled when the pending exit was set, the first scheduler that * schedules a new process will set the receiving process in the exiting * state just before it schedules next process. * * When the exit signal is placed in the pending_exit field, the signal * is considered as being in transit on the Erlang level. The signal is * actually in some kind of semi transit state, since we have already * determined how it should be received. It will exit the process no * matter what if it is received (the process may exit by itself before * reception of the exit signal). The signal is received when it is * discovered in the pending_exit field by the receiver. * * The receiver have to poll the pending_exit field at least before: * - moving messages from the message in queue to the private message * queue. This in order to preserve signal order. * - unlink. Otherwise the process might get exited on a link that * have been removed. * - changing the trap_exit flag to true. This in order to simplify the * implementation; otherwise, we would have to transform the signal * into an 'EXIT' message when setting the trap_exit flag to true. We * would also have to maintain a queue of exit signals in transit. * - being scheduled in or out. */ static ERTS_INLINE int send_exit_signal(Process *c_p, /* current process if and only if reason is stored on it */ Eterm from, /* Id of sender of signal */ Process *rp, /* receiving process */ ErtsProcLocks *rp_locks,/* current locks on receiver */ Eterm reason, /* exit reason */ Eterm exit_tuple, /* Prebuild exit tuple or THE_NON_VALUE */ Uint exit_tuple_sz, /* Size of prebuilt exit tuple (if exit_tuple != THE_NON_VALUE) */ Eterm token, /* token */ Process *token_update, /* token updater */ Uint32 flags /* flags */ ) { Eterm rsn = reason == am_kill ? am_killed : reason; ERTS_SMP_LC_ASSERT(*rp_locks == erts_proc_lc_my_proc_locks(rp)); ERTS_SMP_LC_ASSERT((*rp_locks & ERTS_PROC_LOCKS_XSIG_SEND) == ERTS_PROC_LOCKS_XSIG_SEND); ASSERT(reason != THE_NON_VALUE); if (ERTS_PROC_IS_TRAPPING_EXITS(rp) && (reason != am_kill || (flags & ERTS_XSIG_FLG_IGN_KILL))) { if (is_not_nil(token) && token_update) seq_trace_update_send(token_update); if (is_value(exit_tuple)) send_exit_message(rp, rp_locks, exit_tuple, exit_tuple_sz, token); else erts_deliver_exit_message(from, rp, rp_locks, rsn, token); return 1; /* Receiver will get a message */ } else if (reason != am_normal || (flags & ERTS_XSIG_FLG_NO_IGN_NORMAL)) { #ifdef ERTS_SMP if (!ERTS_PROC_PENDING_EXIT(rp) && !rp->is_exiting) { ASSERT(rp->status != P_EXITING); ASSERT(rp->status != P_FREE); ASSERT(!rp->pending_exit.bp); if (rp == c_p && (*rp_locks & ERTS_PROC_LOCK_MAIN)) { /* Ensure that all locks on c_p are locked before proceeding... */ if (*rp_locks != ERTS_PROC_LOCKS_ALL) { ErtsProcLocks need_locks = (~(*rp_locks) & ERTS_PROC_LOCKS_ALL); if (erts_smp_proc_trylock(c_p, need_locks) == EBUSY) { erts_smp_proc_unlock(c_p, *rp_locks & ~ERTS_PROC_LOCK_MAIN); erts_smp_proc_lock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); } *rp_locks = ERTS_PROC_LOCKS_ALL; } set_proc_exiting(c_p, rsn, NULL); } else if (!(rp->status_flags & ERTS_PROC_SFLG_RUNNING)) { /* Process not running ... */ ErtsProcLocks need_locks = ~(*rp_locks) & ERTS_PROC_LOCKS_ALL; if (need_locks && erts_smp_proc_trylock(rp, need_locks) == EBUSY) { /* ... but we havn't got all locks on it ... */ save_pending_exiter(rp); /* * The pending exit will be discovered when next * process is scheduled in */ goto set_pending_exit; } else { /* ...and we have all locks on it... */ *rp_locks = ERTS_PROC_LOCKS_ALL; set_proc_exiting(rp, (is_immed(rsn) ? rsn : copy_object(rsn, rp)), NULL); } } else { /* Process running... */ /* * The pending exit will be discovered when the process * is scheduled out if not discovered earlier. */ set_pending_exit: if (is_immed(rsn)) { rp->pending_exit.reason = rsn; } else { Eterm *hp; Uint sz = size_object(rsn); ErlHeapFragment *bp = new_message_buffer(sz); hp = &bp->mem[0]; rp->pending_exit.reason = copy_struct(rsn, sz, &hp, &bp->off_heap); rp->pending_exit.bp = bp; } ASSERT(ERTS_PROC_PENDING_EXIT(rp)); } if (!(rp->status_flags & (ERTS_PROC_SFLG_INRUNQ|ERTS_PROC_SFLG_RUNNING))) erts_add_to_runq(rp); } /* else: * * The receiver already has a pending exit (or is exiting) * so we drop this signal. * * NOTE: dropping this exit signal is based on the assumption * that the receiver *will* exit; either on the pending * exit or by itself before seeing the pending exit. */ #else /* !ERTS_SMP */ if (c_p == rp) { rp->status = P_EXITING; c_p->fvalue = rsn; } else if (rp->status != P_EXITING) { /* No recursive process exits /PaN */ Eterm old_status = rp->status; set_proc_exiting(rp, is_immed(rsn) ? rsn : copy_object(rsn, rp), NULL); ACTIVATE(rp); if (old_status != P_RUNABLE && old_status != P_RUNNING) erts_add_to_runq(rp); } #endif return -1; /* Receiver will exit */ } return 0; /* Receiver unaffected */ } int erts_send_exit_signal(Process *c_p, Eterm from, Process *rp, ErtsProcLocks *rp_locks, Eterm reason, Eterm token, Process *token_update, Uint32 flags) { return send_exit_signal(c_p, from, rp, rp_locks, reason, THE_NON_VALUE, 0, token, token_update, flags); } typedef struct { Eterm reason; Process *p; } ExitMonitorContext; static void doit_exit_monitor(ErtsMonitor *mon, void *vpcontext) { ExitMonitorContext *pcontext = vpcontext; DistEntry *dep; ErtsMonitor *rmon; Process *rp; if (mon->type == MON_ORIGIN) { /* We are monitoring someone else, we need to demonitor that one.. */ if (is_atom(mon->pid)) { /* remote by name */ ASSERT(is_node_name_atom(mon->pid)); dep = erts_sysname_to_connected_dist_entry(mon->pid); if (dep) { erts_smp_de_links_lock(dep); rmon = erts_remove_monitor(&(dep->monitors), mon->ref); erts_smp_de_links_unlock(dep); if (rmon) { ErtsDSigData dsd; int code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_demonitor(&dsd, rmon->pid, mon->name, mon->ref, 1); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_destroy_monitor(rmon); } erts_deref_dist_entry(dep); } } else { ASSERT(is_pid(mon->pid)); if (is_internal_pid(mon->pid)) { /* local by pid or name */ rp = erts_pid2proc(NULL, 0, mon->pid, ERTS_PROC_LOCK_LINK); if (!rp) { goto done; } rmon = erts_remove_monitor(&(rp->monitors),mon->ref); erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK); if (rmon == NULL) { goto done; } erts_destroy_monitor(rmon); } else { /* remote by pid */ ASSERT(is_external_pid(mon->pid)); dep = external_pid_dist_entry(mon->pid); ASSERT(dep != NULL); if (dep) { erts_smp_de_links_lock(dep); rmon = erts_remove_monitor(&(dep->monitors), mon->ref); erts_smp_de_links_unlock(dep); if (rmon) { ErtsDSigData dsd; int code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_demonitor(&dsd, rmon->pid, mon->pid, mon->ref, 1); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_destroy_monitor(rmon); } } } } } else { /* type == MON_TARGET */ ASSERT(mon->type == MON_TARGET); ASSERT(is_pid(mon->pid) || is_internal_port(mon->pid)); if (is_internal_port(mon->pid)) { Port *prt = erts_id2port(mon->pid, NULL, 0); if (prt == NULL) { goto done; } erts_fire_port_monitor(prt, mon->ref); erts_port_release(prt); } else if (is_internal_pid(mon->pid)) {/* local by name or pid */ Eterm watched; DeclareTmpHeapNoproc(lhp,3); ErtsProcLocks rp_locks = (ERTS_PROC_LOCK_LINK | ERTS_PROC_LOCKS_MSG_SEND); rp = erts_pid2proc(NULL, 0, mon->pid, rp_locks); if (rp == NULL) { goto done; } UseTmpHeapNoproc(3); rmon = erts_remove_monitor(&(rp->monitors),mon->ref); if (rmon) { erts_destroy_monitor(rmon); watched = (is_atom(mon->name) ? TUPLE2(lhp, mon->name, erts_this_dist_entry->sysname) : pcontext->p->id); erts_queue_monitor_message(rp, &rp_locks, mon->ref, am_process, watched, pcontext->reason); } UnUseTmpHeapNoproc(3); /* else: demonitor while we exited, i.e. do nothing... */ erts_smp_proc_unlock(rp, rp_locks); } else { /* external by pid or name */ ASSERT(is_external_pid(mon->pid)); dep = external_pid_dist_entry(mon->pid); ASSERT(dep != NULL); if (dep) { erts_smp_de_links_lock(dep); rmon = erts_remove_monitor(&(dep->monitors), mon->ref); erts_smp_de_links_unlock(dep); if (rmon) { ErtsDSigData dsd; int code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_m_exit(&dsd, mon->pid, (rmon->name != NIL ? rmon->name : rmon->pid), mon->ref, pcontext->reason); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_destroy_monitor(rmon); } } } } done: /* As the monitors are previously removed from the process, distribution operations will not cause monitors to disappear, we can safely delete it. */ erts_destroy_monitor(mon); } typedef struct { Process *p; Eterm reason; Eterm exit_tuple; Uint exit_tuple_sz; } ExitLinkContext; static void doit_exit_link(ErtsLink *lnk, void *vpcontext) { ExitLinkContext *pcontext = vpcontext; /* Unpack context, it's readonly */ Process *p = pcontext->p; Eterm reason = pcontext->reason; Eterm exit_tuple = pcontext->exit_tuple; Uint exit_tuple_sz = pcontext->exit_tuple_sz; Eterm item = lnk->pid; ErtsLink *rlnk; DistEntry *dep; Process *rp; switch(lnk->type) { case LINK_PID: if(is_internal_port(item)) { Port *prt = erts_id2port(item, NULL, 0); if (prt) { rlnk = erts_remove_link(&prt->nlinks, p->id); if (rlnk) erts_destroy_link(rlnk); erts_do_exit_port(prt, p->id, reason); erts_port_release(prt); } } else if(is_external_port(item)) { erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf(); erts_dsprintf(dsbufp, "Erroneous link between %T and external port %T " "found\n", p->id, item); erts_send_error_to_logger_nogl(dsbufp); ASSERT(0); /* It isn't possible to setup such a link... */ } else if (is_internal_pid(item)) { ErtsProcLocks rp_locks = (ERTS_PROC_LOCK_LINK | ERTS_PROC_LOCKS_XSIG_SEND); rp = erts_pid2proc(NULL, 0, item, rp_locks); if (rp) { rlnk = erts_remove_link(&(rp->nlinks), p->id); /* If rlnk == NULL, we got unlinked while exiting, i.e., do nothing... */ if (rlnk) { int xres; erts_destroy_link(rlnk); xres = send_exit_signal(NULL, p->id, rp, &rp_locks, reason, exit_tuple, exit_tuple_sz, SEQ_TRACE_TOKEN(p), p, ERTS_XSIG_FLG_IGN_KILL); if (xres >= 0 && IS_TRACED_FL(rp, F_TRACE_PROCS)) { /* We didn't exit the process and it is traced */ if (IS_TRACED_FL(rp, F_TRACE_PROCS)) { trace_proc(p, rp, am_getting_unlinked, p->id); } } } ASSERT(rp != p); erts_smp_proc_unlock(rp, rp_locks); } } else if (is_external_pid(item)) { dep = external_pid_dist_entry(item); if(dep != erts_this_dist_entry) { ErtsDSigData dsd; int code; ErtsDistLinkData dld; erts_remove_dist_link(&dld, p->id, item, dep); erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN); code = erts_dsig_prepare(&dsd, dep, p, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_exit_tt(&dsd, p->id, item, reason, SEQ_TRACE_TOKEN(p)); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN); erts_destroy_dist_link(&dld); } } break; case LINK_NODE: ASSERT(is_node_name_atom(item)); dep = erts_sysname_to_connected_dist_entry(item); if(dep) { /* dist entries have node links in a separate structure to avoid confusion */ erts_smp_de_links_lock(dep); rlnk = erts_remove_link(&(dep->node_links), p->id); erts_smp_de_links_unlock(dep); if (rlnk) erts_destroy_link(rlnk); erts_deref_dist_entry(dep); } else { #ifndef ERTS_SMP /* XXX Is this possible? Shouldn't this link previously have been removed if the node had previously been disconnected. */ ASSERT(0); #endif /* This is possible when smp support has been enabled, and dist port and process exits simultaneously. */ } break; default: erl_exit(1, "bad type in link list\n"); break; } erts_destroy_link(lnk); } static void resume_suspend_monitor(ErtsSuspendMonitor *smon, void *vc_p) { Process *suspendee = erts_pid2proc((Process *) vc_p, ERTS_PROC_LOCK_MAIN, smon->pid, ERTS_PROC_LOCK_STATUS); if (suspendee) { if (smon->active) resume_process(suspendee); erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); } erts_destroy_suspend_monitor(smon); } static void continue_exit_process(Process *p #ifdef ERTS_SMP , erts_pix_lock_t *pix_lock #endif ); /* this function fishishes a process and propagates exit messages - called by process_main when a process dies */ void erts_do_exit_process(Process* p, Eterm reason) { #ifdef ERTS_SMP erts_pix_lock_t *pix_lock = ERTS_PID2PIXLOCK(p->id); #endif p->arity = 0; /* No live registers */ p->fvalue = reason; #ifdef ERTS_SMP ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); /* By locking all locks (main lock is already locked) when going to status P_EXITING, it is enough to take any lock when looking up a process (erts_pid2proc()) to prevent the looked up process from exiting until the lock has been released. */ erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR); #endif if (erts_system_profile_flags.runnable_procs && (p->status != P_WAITING)) { profile_runnable_proc(p, am_inactive); } #ifdef ERTS_SMP erts_pix_lock(pix_lock); p->is_exiting = 1; #endif p->status = P_EXITING; #ifdef ERTS_SMP erts_pix_unlock(pix_lock); if (ERTS_PROC_PENDING_EXIT(p)) { /* Process exited before pending exit was received... */ p->pending_exit.reason = THE_NON_VALUE; if (p->pending_exit.bp) { free_message_buffer(p->pending_exit.bp); p->pending_exit.bp = NULL; } } cancel_suspend_of_suspendee(p, ERTS_PROC_LOCKS_ALL); ERTS_SMP_MSGQ_MV_INQ2PRIVQ(p); #endif if (IS_TRACED(p)) { if (IS_TRACED_FL(p, F_TRACE_CALLS)) erts_schedule_time_break(p, ERTS_BP_CALL_TIME_SCHEDULE_EXITING); if (IS_TRACED_FL(p,F_TRACE_PROCS)) trace_proc(p, p, am_exit, reason); } erts_trace_check_exiting(p->id); ASSERT((p->trace_flags & F_INITIAL_TRACE_FLAGS) == F_INITIAL_TRACE_FLAGS); cancel_timer(p); /* Always cancel timer just in case */ /* * The timer of this process can *not* be used anymore. The field used * for the timer is now used for misc exiting data. */ p->u.exit_data = NULL; if (p->bif_timers) erts_cancel_bif_timers(p, ERTS_PROC_LOCKS_ALL); erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL_MINOR); #ifdef ERTS_SMP continue_exit_process(p, pix_lock); #else continue_exit_process(p); #endif } void erts_continue_exit_process(Process *c_p) { #ifdef ERTS_SMP continue_exit_process(c_p, ERTS_PID2PIXLOCK(c_p->id)); #else continue_exit_process(c_p); #endif } static void continue_exit_process(Process *p #ifdef ERTS_SMP , erts_pix_lock_t *pix_lock #endif ) { ErtsLink* lnk; ErtsMonitor *mon; ErtsProcLocks curr_locks = ERTS_PROC_LOCK_MAIN; Eterm reason = p->fvalue; DistEntry *dep; struct saved_calls *scb; process_breakpoint_time_t *pbt; #ifdef DEBUG int yield_allowed = 1; #endif ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(p)); #ifdef DEBUG erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); ASSERT(p->status == P_EXITING); erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); #endif #ifdef ERTS_SMP if (p->flags & F_HAVE_BLCKD_MSCHED) { ErtsSchedSuspendResult ssr; ssr = erts_block_multi_scheduling(p, ERTS_PROC_LOCK_MAIN, 0, 1); switch (ssr) { case ERTS_SCHDLR_SSPND_YIELD_RESTART: goto yield; case ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED: case ERTS_SCHDLR_SSPND_YIELD_DONE_MSCHED_BLOCKED: case ERTS_SCHDLR_SSPND_DONE: case ERTS_SCHDLR_SSPND_YIELD_DONE: p->flags &= ~F_HAVE_BLCKD_MSCHED; break; case ERTS_SCHDLR_SSPND_EINVAL: default: erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error: %d\n", __FILE__, __LINE__, (int) ssr); } } #endif if (p->flags & F_USING_DB) { if (erts_db_process_exiting(p, ERTS_PROC_LOCK_MAIN)) goto yield; p->flags &= ~F_USING_DB; } if (p->flags & F_USING_DDLL) { erts_ddll_proc_dead(p, ERTS_PROC_LOCK_MAIN); p->flags &= ~F_USING_DDLL; } if (p->nodes_monitors) { erts_delete_nodes_monitors(p, ERTS_PROC_LOCK_MAIN); p->nodes_monitors = NULL; } if (p->suspend_monitors) { erts_sweep_suspend_monitors(p->suspend_monitors, resume_suspend_monitor, p); p->suspend_monitors = NULL; } /* * The registered name *should* be the last "erlang resource" to * cleanup. */ if (p->reg) { (void) erts_unregister_name(p, ERTS_PROC_LOCK_MAIN, NULL, THE_NON_VALUE); ASSERT(!p->reg); } erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR); curr_locks = ERTS_PROC_LOCKS_ALL; /* * From this point on we are no longer allowed to yield * this process. */ #ifdef DEBUG yield_allowed = 0; #endif { int pix; /* Do *not* use erts_get_runq_proc() */ ErtsRunQueue *rq; rq = erts_get_runq_current(ERTS_GET_SCHEDULER_DATA_FROM_PROC(p)); ASSERT(internal_pid_index(p->id) < erts_max_processes); pix = internal_pid_index(p->id); erts_smp_mtx_lock(&proc_tab_mtx); erts_smp_runq_lock(rq); #ifdef ERTS_SMP erts_pix_lock(pix_lock); ASSERT(p->scheduler_data); ASSERT(p->scheduler_data->current_process == p); ASSERT(p->scheduler_data->free_process == NULL); p->scheduler_data->current_process = NULL; p->scheduler_data->free_process = p; p->status_flags = 0; #endif process_tab[pix] = NULL; /* Time of death! */ ASSERT(erts_smp_atomic32_read(&process_count) > 0); erts_smp_atomic32_dec(&process_count); #ifdef ERTS_SMP erts_pix_unlock(pix_lock); #endif erts_smp_runq_unlock(rq); if (p_next < 0) { if (p_last >= p_next) { p_serial++; p_serial &= p_serial_mask; } p_next = pix; } ERTS_MAYBE_SAVE_TERMINATING_PROCESS(p); erts_smp_mtx_unlock(&proc_tab_mtx); } /* * All "erlang resources" have to be deallocated before this point, * e.g. registered name, so monitoring and linked processes can * be sure that all interesting resources have been deallocated * when the monitors and/or links hit. */ mon = p->monitors; p->monitors = NULL; /* to avoid recursive deletion during traversal */ lnk = p->nlinks; p->nlinks = NULL; p->status = P_FREE; dep = ((p->flags & F_DISTRIBUTION) ? ERTS_PROC_SET_DIST_ENTRY(p, ERTS_PROC_LOCKS_ALL, NULL) : NULL); scb = ERTS_PROC_SET_SAVED_CALLS_BUF(p, ERTS_PROC_LOCKS_ALL, NULL); pbt = ERTS_PROC_SET_CALL_TIME(p, ERTS_PROC_LOCKS_ALL, NULL); erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); processes_busy--; if (dep) { erts_do_net_exits(dep, reason); if(dep) erts_deref_dist_entry(dep); } /* * Pre-build the EXIT tuple if there are any links. */ if (lnk) { DeclareTmpHeap(tmp_heap,4,p); Eterm exit_tuple; Uint exit_tuple_sz; Eterm* hp; UseTmpHeap(4,p); hp = &tmp_heap[0]; exit_tuple = TUPLE3(hp, am_EXIT, p->id, reason); exit_tuple_sz = size_object(exit_tuple); { ExitLinkContext context = {p, reason, exit_tuple, exit_tuple_sz}; erts_sweep_links(lnk, &doit_exit_link, &context); } UnUseTmpHeap(4,p); } { ExitMonitorContext context = {reason, p}; erts_sweep_monitors(mon,&doit_exit_monitor,&context); /* Allocates TmpHeap, but we have none here */ } if (scb) erts_free(ERTS_ALC_T_CALLS_BUF, (void *) scb); if (pbt) erts_free(ERTS_ALC_T_BPD, (void *) pbt); delete_process(p); erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN); ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); return; yield: #ifdef DEBUG ASSERT(yield_allowed); #endif ERTS_SMP_LC_ASSERT(curr_locks == erts_proc_lc_my_proc_locks(p)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN & curr_locks); ASSERT(p->status == P_EXITING); p->i = (BeamInstr *) beam_continue_exit; if (!(curr_locks & ERTS_PROC_LOCK_STATUS)) { erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); curr_locks |= ERTS_PROC_LOCK_STATUS; } erts_add_to_runq(p); if (curr_locks != ERTS_PROC_LOCK_MAIN) erts_smp_proc_unlock(p, ~ERTS_PROC_LOCK_MAIN & curr_locks); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(p)); } /* Callback for process timeout */ static void timeout_proc(Process* p) { BeamInstr** pi = (BeamInstr **) p->def_arg_reg; p->i = *pi; p->flags |= F_TIMO; p->flags &= ~F_INSLPQUEUE; switch (p->status) { case P_GARBING: switch (p->gcstatus) { case P_SUSPENDED: goto suspended; case P_WAITING: goto waiting; default: break; } break; case P_WAITING: waiting: erts_add_to_runq(p); break; case P_SUSPENDED: suspended: p->rstatus = P_RUNABLE; /* MUST set resume status to runnable */ break; default: break; } } void cancel_timer(Process* p) { ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(p)); p->flags &= ~(F_INSLPQUEUE|F_TIMO); #ifdef ERTS_SMP erts_cancel_smp_ptimer(p->u.ptimer); #else erts_cancel_timer(&p->u.tm); #endif } /* * Insert a process into the time queue, with a timeout 'timeout' in ms. */ void set_timer(Process* p, Uint timeout) { ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(p)); /* check for special case timeout=0 DONT ADD TO time queue */ if (timeout == 0) { p->flags |= F_TIMO; return; } p->flags |= F_INSLPQUEUE; p->flags &= ~F_TIMO; #ifdef ERTS_SMP erts_create_smp_ptimer(&p->u.ptimer, p->id, (ErlTimeoutProc) timeout_proc, timeout); #else erts_set_timer(&p->u.tm, (ErlTimeoutProc) timeout_proc, NULL, (void*) p, timeout); #endif } /* * Stack dump functions follow. */ void erts_stack_dump(int to, void *to_arg, Process *p) { Eterm* sp; int yreg = -1; if (p->trace_flags & F_SENSITIVE) { return; } erts_program_counter_info(to, to_arg, p); for (sp = p->stop; sp < STACK_START(p); sp++) { yreg = stack_element_dump(to, to_arg, p, sp, yreg); } } void erts_program_counter_info(int to, void *to_arg, Process *p) { int i; erts_print(to, to_arg, "Program counter: %p (", p->i); print_function_from_pc(to, to_arg, p->i); erts_print(to, to_arg, ")\n"); erts_print(to, to_arg, "CP: %p (", p->cp); print_function_from_pc(to, to_arg, p->cp); erts_print(to, to_arg, ")\n"); if (!((p->status == P_RUNNING) || (p->status == P_GARBING))) { erts_print(to, to_arg, "arity = %d\n",p->arity); if (!ERTS_IS_CRASH_DUMPING) { /* * Only print the arguments if we are not writing a * crash dump file. The arguments cannot be interpreted * by the crashdump_viewer application and will therefore * only cause problems. */ for (i = 0; i < p->arity; i++) erts_print(to, to_arg, " %.*T\n", INT_MAX, p->arg_reg[i]); } } } static void print_function_from_pc(int to, void *to_arg, BeamInstr* x) { BeamInstr* addr = find_function_from_pc(x); if (addr == NULL) { if (x == beam_exit) { erts_print(to, to_arg, ""); } else if (x == beam_continue_exit) { erts_print(to, to_arg, ""); } else if (x == beam_apply+1) { erts_print(to, to_arg, ""); } else if (x == 0) { erts_print(to, to_arg, "invalid"); } else { erts_print(to, to_arg, "unknown function"); } } else { erts_print(to, to_arg, "%T:%T/%d + %d", addr[0], addr[1], addr[2], ((x-addr)-2) * sizeof(Eterm)); } } static int stack_element_dump(int to, void *to_arg, Process* p, Eterm* sp, int yreg) { Eterm x = *sp; if (yreg < 0 || is_CP(x)) { erts_print(to, to_arg, "\n%p ", sp); } else { char sbuf[16]; sprintf(sbuf, "y(%d)", yreg); erts_print(to, to_arg, "%-8s ", sbuf); yreg++; } if (is_CP(x)) { erts_print(to, to_arg, "Return addr %p (", (Eterm *) EXPAND_POINTER(x)); print_function_from_pc(to, to_arg, cp_val(x)); erts_print(to, to_arg, ")\n"); yreg = 0; } else if is_catch(x) { erts_print(to, to_arg, "Catch %p (", catch_pc(x)); print_function_from_pc(to, to_arg, catch_pc(x)); erts_print(to, to_arg, ")\n"); } else { erts_print(to, to_arg, "%T\n", x); } return yreg; } /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\ * The processes/0 BIF implementation. * \* */ #define ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED 25 #define ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE 1000 #define ERTS_PROCESSES_BIF_MIN_START_REDS \ (ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE \ / ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED) #define ERTS_PROCESSES_BIF_TAB_FREE_TERM_PROC_REDS 1 #define ERTS_PROCESSES_BIF_INSPECT_TERM_PROC_PER_RED 10 #define ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS \ (ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE \ / ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED) #define ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED 75 #define ERTS_PROCS_DBG_DO_TRACE 0 #ifdef DEBUG # define ERTS_PROCESSES_BIF_DEBUGLEVEL 100 #else # define ERTS_PROCESSES_BIF_DEBUGLEVEL 0 #endif #define ERTS_PROCS_DBGLVL_CHK_HALLOC 1 #define ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS 5 #define ERTS_PROCS_DBGLVL_CHK_PIDS 10 #define ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST 20 #define ERTS_PROCS_DBGLVL_CHK_RESLIST 20 #if ERTS_PROCESSES_BIF_DEBUGLEVEL == 0 # define ERTS_PROCS_ASSERT(EXP) #else # define ERTS_PROCS_ASSERT(EXP) \ ((void) ((EXP) \ ? 1 \ : (debug_processes_assert_error(#EXP, __FILE__, __LINE__), 0))) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_HALLOC # define ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(PBDP, HP, SZ) \ do { \ ERTS_PROCS_ASSERT(!(PBDP)->debug.heap); \ ERTS_PROCS_ASSERT(!(PBDP)->debug.heap_size); \ (PBDP)->debug.heap = (HP); \ (PBDP)->debug.heap_size = (SZ); \ } while (0) # define ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(PBDP, HP) \ do { \ ERTS_PROCS_ASSERT((PBDP)->debug.heap); \ ERTS_PROCS_ASSERT((PBDP)->debug.heap_size); \ ERTS_PROCS_ASSERT((PBDP)->debug.heap + (PBDP)->debug.heap_size == (HP));\ (PBDP)->debug.heap = NULL; \ (PBDP)->debug.heap_size = 0; \ } while (0) # define ERTS_PROCS_DBG_HEAP_ALLOC_INIT(PBDP) \ do { \ (PBDP)->debug.heap = NULL; \ (PBDP)->debug.heap_size = 0; \ } while (0) #else # define ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(PBDP, HP, SZ) # define ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(PBDP, HP) # define ERTS_PROCS_DBG_HEAP_ALLOC_INIT(PBDP) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_RESLIST # define ERTS_PROCS_DBG_CHK_RESLIST(R) debug_processes_check_res_list((R)) #else # define ERTS_PROCS_DBG_CHK_RESLIST(R) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS # define ERTS_PROCS_DBG_SAVE_PIDS(PBDP) debug_processes_save_all_pids((PBDP)) # define ERTS_PROCS_DBG_VERIFY_PIDS(PBDP) \ do { \ if (!(PBDP)->debug.correct_pids_verified) \ debug_processes_verify_all_pids((PBDP)); \ } while (0) # define ERTS_PROCS_DBG_CLEANUP_CHK_PIDS(PBDP) \ do { \ if ((PBDP)->debug.correct_pids) { \ erts_free(ERTS_ALC_T_PROCS_PIDS, \ (PBDP)->debug.correct_pids); \ (PBDP)->debug.correct_pids = NULL; \ } \ } while(0) # define ERTS_PROCS_DBG_CHK_PIDS_INIT(PBDP) \ do { \ (PBDP)->debug.correct_pids_verified = 0; \ (PBDP)->debug.correct_pids = NULL; \ } while (0) #else # define ERTS_PROCS_DBG_SAVE_PIDS(PBDP) # define ERTS_PROCS_DBG_VERIFY_PIDS(PBDP) # define ERTS_PROCS_DBG_CLEANUP_CHK_PIDS(PBDP) # define ERTS_PROCS_DBG_CHK_PIDS_INIT(PBDP) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS # define ERTS_PROCS_DBG_CHK_PID_FOUND(PBDP, PID, TVP) \ debug_processes_check_found_pid((PBDP), (PID), (TVP), 1) # define ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(PBDP, PID, TVP) \ debug_processes_check_found_pid((PBDP), (PID), (TVP), 0) #else # define ERTS_PROCS_DBG_CHK_PID_FOUND(PBDP, PID, TVP) # define ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(PBDP, PID, TVP) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST # define ERTS_PROCS_DBG_CHK_TPLIST() \ debug_processes_check_term_proc_list() # define ERTS_PROCS_DBG_CHK_FREELIST(FL) \ debug_processes_check_term_proc_free_list(FL) #else # define ERTS_PROCS_DBG_CHK_TPLIST() # define ERTS_PROCS_DBG_CHK_FREELIST(FL) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL == 0 #if ERTS_PROCS_DBG_DO_TRACE # define ERTS_PROCS_DBG_INIT(P, PBDP) (PBDP)->debug.caller = (P)->id # else # define ERTS_PROCS_DBG_INIT(P, PBDP) # endif # define ERTS_PROCS_DBG_CLEANUP(PBDP) #else # define ERTS_PROCS_DBG_INIT(P, PBDP) \ do { \ (PBDP)->debug.caller = (P)->id; \ ERTS_PROCS_DBG_HEAP_ALLOC_INIT((PBDP)); \ ERTS_PROCS_DBG_CHK_PIDS_INIT((PBDP)); \ } while (0) # define ERTS_PROCS_DBG_CLEANUP(PBDP) \ do { \ ERTS_PROCS_DBG_CLEANUP_CHK_PIDS((PBDP)); \ } while (0) #endif #if ERTS_PROCS_DBG_DO_TRACE # define ERTS_PROCS_DBG_TRACE(PID, FUNC, WHAT) \ erts_fprintf(stderr, "%T %s:%d:%s(): %s\n", \ (PID), __FILE__, __LINE__, #FUNC, #WHAT) #else # define ERTS_PROCS_DBG_TRACE(PID, FUNC, WHAT) #endif static Uint processes_bif_tab_chunks; static Export processes_trap_export; typedef struct { SysTimeval time; } ErtsProcessesBifChunkInfo; typedef enum { INITIALIZING, INSPECTING_TABLE, INSPECTING_TERMINATED_PROCESSES, BUILDING_RESULT, RETURN_RESULT } ErtsProcessesBifState; typedef struct { ErtsProcessesBifState state; Eterm caller; ErtsProcessesBifChunkInfo *chunk; int tix; int pid_ix; int pid_sz; Eterm *pid; ErtsTermProcElement *bif_invocation; /* Only used when > 1 chunk */ #if ERTS_PROCESSES_BIF_DEBUGLEVEL != 0 || ERTS_PROCS_DBG_DO_TRACE struct { Eterm caller; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS SysTimeval *pid_started; #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_HALLOC Eterm *heap; Uint heap_size; #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS int correct_pids_verified; Eterm *correct_pids; #endif } debug; #endif } ErtsProcessesBifData; #if ERTS_PROCESSES_BIF_DEBUGLEVEL != 0 static void debug_processes_assert_error(char* expr, char* file, int line); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_RESLIST static void debug_processes_check_res_list(Eterm list); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS static void debug_processes_save_all_pids(ErtsProcessesBifData *pbdp); static void debug_processes_verify_all_pids(ErtsProcessesBifData *pbdp); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS static void debug_processes_check_found_pid(ErtsProcessesBifData *pbdp, Eterm pid, SysTimeval *started, int pid_should_be_found); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST static SysTimeval debug_tv_start; static void debug_processes_check_term_proc_list(void); static void debug_processes_check_term_proc_free_list(ErtsTermProcElement *tpep); #endif static void save_terminating_process(Process *p) { ErtsTermProcElement *tpep = erts_alloc(ERTS_ALC_T_PROCS_TPROC_EL, sizeof(ErtsTermProcElement)); ERTS_PROCS_ASSERT(saved_term_procs.start && saved_term_procs.end); ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&proc_tab_mtx)); ERTS_PROCS_DBG_CHK_TPLIST(); tpep->prev = saved_term_procs.end; tpep->next = NULL; tpep->ix = internal_pid_index(p->id); tpep->u.process.pid = p->id; tpep->u.process.spawned = p->started; erts_get_emu_time(&tpep->u.process.exited); saved_term_procs.end->next = tpep; saved_term_procs.end = tpep; ERTS_PROCS_DBG_CHK_TPLIST(); ERTS_PROCS_ASSERT((tpep->prev->ix >= 0 ? erts_cmp_timeval(&tpep->u.process.exited, &tpep->prev->u.process.exited) : erts_cmp_timeval(&tpep->u.process.exited, &tpep->prev->u.bif_invocation.time)) > 0); } static void cleanup_processes_bif_data(Binary *bp) { ErtsProcessesBifData *pbdp = ERTS_MAGIC_BIN_DATA(bp); ERTS_PROCS_DBG_TRACE(pbdp->debug.caller, cleanup_processes_bif_data, call); if (pbdp->state != INITIALIZING) { if (pbdp->chunk) { erts_free(ERTS_ALC_T_PROCS_CNKINF, pbdp->chunk); pbdp->chunk = NULL; } if (pbdp->pid) { erts_free(ERTS_ALC_T_PROCS_PIDS, pbdp->pid); pbdp->pid = NULL; } #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS if (pbdp->debug.pid_started) { erts_free(ERTS_ALC_T_PROCS_PIDS, pbdp->debug.pid_started); pbdp->debug.pid_started = NULL; } #endif if (pbdp->bif_invocation) { ErtsTermProcElement *tpep; erts_smp_mtx_lock(&proc_tab_mtx); ERTS_PROCS_DBG_TRACE(pbdp->debug.caller, cleanup_processes_bif_data, term_proc_cleanup); tpep = pbdp->bif_invocation; pbdp->bif_invocation = NULL; ERTS_PROCS_DBG_CHK_TPLIST(); if (tpep->prev) { /* * Only remove this bif invokation when we * have preceding invokations. */ tpep->prev->next = tpep->next; if (tpep->next) tpep->next->prev = tpep->prev; else { /* * At the time of writing this branch cannot be * reached. I don't want to remove this code though * since it may be possible to reach this line * in the future if the cleanup order in * erts_do_exit_process() is changed. The ASSERT(0) * is only here to make us aware that the reorder * has happened. /rickard */ ASSERT(0); saved_term_procs.end = tpep->prev; } erts_free(ERTS_ALC_T_PROCS_TPROC_EL, tpep); } else { /* * Free all elements until next bif invokation * is found. */ ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); do { ErtsTermProcElement *ftpep = tpep; tpep = tpep->next; erts_free(ERTS_ALC_T_PROCS_TPROC_EL, ftpep); } while (tpep && tpep->ix >= 0); saved_term_procs.start = tpep; if (tpep) tpep->prev = NULL; else saved_term_procs.end = NULL; } ERTS_PROCS_DBG_CHK_TPLIST(); erts_smp_mtx_unlock(&proc_tab_mtx); } } ERTS_PROCS_DBG_TRACE(pbdp->debug.caller, cleanup_processes_bif_data, return); ERTS_PROCS_DBG_CLEANUP(pbdp); } static int processes_bif_engine(Process *p, Eterm *res_accp, Binary *mbp) { ErtsProcessesBifData *pbdp = ERTS_MAGIC_BIN_DATA(mbp); int have_reds; int reds; int locked = 0; do { switch (pbdp->state) { case INITIALIZING: pbdp->chunk = erts_alloc(ERTS_ALC_T_PROCS_CNKINF, (sizeof(ErtsProcessesBifChunkInfo) * processes_bif_tab_chunks)); pbdp->tix = 0; pbdp->pid_ix = 0; erts_smp_mtx_lock(&proc_tab_mtx); locked = 1; ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, init); pbdp->pid_sz = erts_process_count(); pbdp->pid = erts_alloc(ERTS_ALC_T_PROCS_PIDS, sizeof(Eterm)*pbdp->pid_sz); #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started = erts_alloc(ERTS_ALC_T_PROCS_PIDS, sizeof(SysTimeval)*pbdp->pid_sz); #endif ERTS_PROCS_DBG_SAVE_PIDS(pbdp); if (processes_bif_tab_chunks == 1) pbdp->bif_invocation = NULL; else { /* * We will have to access the table multiple times * releasing the table lock in between chunks. */ pbdp->bif_invocation = erts_alloc(ERTS_ALC_T_PROCS_TPROC_EL, sizeof(ErtsTermProcElement)); pbdp->bif_invocation->ix = -1; erts_get_emu_time(&pbdp->bif_invocation->u.bif_invocation.time); ERTS_PROCS_DBG_CHK_TPLIST(); pbdp->bif_invocation->next = NULL; if (saved_term_procs.end) { pbdp->bif_invocation->prev = saved_term_procs.end; saved_term_procs.end->next = pbdp->bif_invocation; ERTS_PROCS_ASSERT(saved_term_procs.start); } else { pbdp->bif_invocation->prev = NULL; saved_term_procs.start = pbdp->bif_invocation; } saved_term_procs.end = pbdp->bif_invocation; ERTS_PROCS_DBG_CHK_TPLIST(); } pbdp->state = INSPECTING_TABLE; /* Fall through */ case INSPECTING_TABLE: { int ix = pbdp->tix; int indices = ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; int cix = ix / ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; int end_ix = ix + indices; SysTimeval *invocation_timep; invocation_timep = (pbdp->bif_invocation ? &pbdp->bif_invocation->u.bif_invocation.time : NULL); ERTS_PROCS_ASSERT(is_nil(*res_accp)); if (!locked) { erts_smp_mtx_lock(&proc_tab_mtx); locked = 1; } ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&proc_tab_mtx)); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, insp_table); if (cix != 0) erts_get_emu_time(&pbdp->chunk[cix].time); else if (pbdp->bif_invocation) pbdp->chunk[0].time = *invocation_timep; /* else: Time is irrelevant */ if (end_ix >= erts_max_processes) { ERTS_PROCS_ASSERT(cix+1 == processes_bif_tab_chunks); end_ix = erts_max_processes; indices = end_ix - ix; /* What to do when done with this chunk */ pbdp->state = (processes_bif_tab_chunks == 1 ? BUILDING_RESULT : INSPECTING_TERMINATED_PROCESSES); } for (; ix < end_ix; ix++) { Process *rp = process_tab[ix]; if (rp && (!invocation_timep || erts_cmp_timeval(&rp->started, invocation_timep) < 0)) { ERTS_PROCS_ASSERT(is_internal_pid(rp->id)); pbdp->pid[pbdp->pid_ix] = rp->id; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started[pbdp->pid_ix] = rp->started; #endif pbdp->pid_ix++; ERTS_PROCS_ASSERT(pbdp->pid_ix <= pbdp->pid_sz); } } pbdp->tix = end_ix; erts_smp_mtx_unlock(&proc_tab_mtx); locked = 0; reds = indices/ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED; BUMP_REDS(p, reds); have_reds = ERTS_BIF_REDS_LEFT(p); if (have_reds && pbdp->state == INSPECTING_TABLE) { ix = pbdp->tix; indices = ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; end_ix = ix + indices; if (end_ix > erts_max_processes) { end_ix = erts_max_processes; indices = end_ix - ix; } reds = indices/ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED; /* Pretend we have no reds left if we haven't got enough reductions to complete next chunk */ if (reds > have_reds) have_reds = 0; } break; } case INSPECTING_TERMINATED_PROCESSES: { int i; int max_reds; int free_term_procs = 0; SysTimeval *invocation_timep; ErtsTermProcElement *tpep; ErtsTermProcElement *free_list = NULL; tpep = pbdp->bif_invocation; ERTS_PROCS_ASSERT(tpep); invocation_timep = &tpep->u.bif_invocation.time; max_reds = have_reds = ERTS_BIF_REDS_LEFT(p); if (max_reds > ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS) max_reds = ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS; reds = 0; erts_smp_mtx_lock(&proc_tab_mtx); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, insp_term_procs); ERTS_PROCS_DBG_CHK_TPLIST(); if (tpep->prev) tpep->prev->next = tpep->next; else { ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); saved_term_procs.start = tpep->next; if (saved_term_procs.start && saved_term_procs.start->ix >= 0) { free_list = saved_term_procs.start; free_term_procs = 1; } } if (tpep->next) tpep->next->prev = tpep->prev; else saved_term_procs.end = tpep->prev; tpep = tpep->next; i = 0; while (reds < max_reds && tpep) { if (tpep->ix < 0) { if (free_term_procs) { ERTS_PROCS_ASSERT(free_list); ERTS_PROCS_ASSERT(tpep->prev); tpep->prev->next = NULL; /* end of free_list */ saved_term_procs.start = tpep; tpep->prev = NULL; free_term_procs = 0; } } else { int cix = tpep->ix/ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; SysTimeval *chunk_timep = &pbdp->chunk[cix].time; Eterm pid = tpep->u.process.pid; ERTS_PROCS_ASSERT(is_internal_pid(pid)); if (erts_cmp_timeval(&tpep->u.process.spawned, invocation_timep) < 0) { if (erts_cmp_timeval(&tpep->u.process.exited, chunk_timep) < 0) { ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(pbdp, pid, &tpep->u.process.spawned); pbdp->pid[pbdp->pid_ix] = pid; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started[pbdp->pid_ix] = tpep->u.process.spawned; #endif pbdp->pid_ix++; ERTS_PROCS_ASSERT(pbdp->pid_ix <= pbdp->pid_sz); } else { ERTS_PROCS_DBG_CHK_PID_FOUND(pbdp, pid, &tpep->u.process.spawned); } } else { ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(pbdp, pid, &tpep->u.process.spawned); } i++; if (i == ERTS_PROCESSES_BIF_INSPECT_TERM_PROC_PER_RED) { reds++; i = 0; } if (free_term_procs) reds += ERTS_PROCESSES_BIF_TAB_FREE_TERM_PROC_REDS; } tpep = tpep->next; } if (free_term_procs) { ERTS_PROCS_ASSERT(free_list); saved_term_procs.start = tpep; if (!tpep) saved_term_procs.end = NULL; else { ERTS_PROCS_ASSERT(tpep->prev); tpep->prev->next = NULL; /* end of free_list */ tpep->prev = NULL; } } if (!tpep) { /* Done */ ERTS_PROCS_ASSERT(pbdp->pid_ix == pbdp->pid_sz); pbdp->state = BUILDING_RESULT; pbdp->bif_invocation->next = free_list; free_list = pbdp->bif_invocation; pbdp->bif_invocation = NULL; } else { /* Link in bif_invocation again where we left off */ pbdp->bif_invocation->prev = tpep->prev; pbdp->bif_invocation->next = tpep; tpep->prev = pbdp->bif_invocation; if (pbdp->bif_invocation->prev) pbdp->bif_invocation->prev->next = pbdp->bif_invocation; else { ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); saved_term_procs.start = pbdp->bif_invocation; } } ERTS_PROCS_DBG_CHK_TPLIST(); ERTS_PROCS_DBG_CHK_FREELIST(free_list); erts_smp_mtx_unlock(&proc_tab_mtx); /* * We do the actual free of term proc structures now when we * have released the table lock instead of when we encountered * them. This since free() isn't for free and we don't want to * unnecessarily block other schedulers. */ while (free_list) { tpep = free_list; free_list = tpep->next; erts_free(ERTS_ALC_T_PROCS_TPROC_EL, tpep); } have_reds -= reds; if (have_reds < 0) have_reds = 0; BUMP_REDS(p, reds); break; } case BUILDING_RESULT: { int conses, ix, min_ix; Eterm *hp; Eterm res = *res_accp; ERTS_PROCS_DBG_VERIFY_PIDS(pbdp); ERTS_PROCS_DBG_CHK_RESLIST(res); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, begin_build_res); have_reds = ERTS_BIF_REDS_LEFT(p); conses = ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED*have_reds; min_ix = pbdp->pid_ix - conses; if (min_ix < 0) { min_ix = 0; conses = pbdp->pid_ix; } hp = HAlloc(p, conses*2); ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(pbdp, hp, conses*2); for (ix = pbdp->pid_ix - 1; ix >= min_ix; ix--) { ERTS_PROCS_ASSERT(is_internal_pid(pbdp->pid[ix])); res = CONS(hp, pbdp->pid[ix], res); hp += 2; } ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(pbdp, hp); pbdp->pid_ix = min_ix; if (min_ix == 0) pbdp->state = RETURN_RESULT; else { pbdp->pid_sz = min_ix; pbdp->pid = erts_realloc(ERTS_ALC_T_PROCS_PIDS, pbdp->pid, sizeof(Eterm)*pbdp->pid_sz); #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started = erts_realloc(ERTS_ALC_T_PROCS_PIDS, pbdp->debug.pid_started, sizeof(SysTimeval)*pbdp->pid_sz); #endif } reds = conses/ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED; BUMP_REDS(p, reds); have_reds -= reds; ERTS_PROCS_DBG_CHK_RESLIST(res); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, end_build_res); *res_accp = res; break; } case RETURN_RESULT: cleanup_processes_bif_data(mbp); return 1; default: erl_exit(ERTS_ABORT_EXIT, "erlang:processes/0: Invalid state: %d\n", (int) pbdp->state); } } while (have_reds || pbdp->state == RETURN_RESULT); return 0; } /* * processes_trap/2 is a hidden BIF that processes/0 traps to. */ static BIF_RETTYPE processes_trap(BIF_ALIST_2) { Eterm res_acc; Binary *mbp; /* * This bif cannot be called from erlang code. It can only be * trapped to from processes/0; therefore, a bad argument * is a processes/0 internal error. */ ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_trap, call); ERTS_PROCS_ASSERT(is_nil(BIF_ARG_1) || is_list(BIF_ARG_1)); res_acc = BIF_ARG_1; ERTS_PROCS_ASSERT(ERTS_TERM_IS_MAGIC_BINARY(BIF_ARG_2)); mbp = ((ProcBin *) binary_val(BIF_ARG_2))->val; ERTS_PROCS_ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(mbp) == cleanup_processes_bif_data); ERTS_PROCS_ASSERT( ((ErtsProcessesBifData *) ERTS_MAGIC_BIN_DATA(mbp))->debug.caller == BIF_P->id); if (processes_bif_engine(BIF_P, &res_acc, mbp)) { ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_trap, return); BIF_RET(res_acc); } else { ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_trap, trap); ERTS_BIF_YIELD2(&processes_trap_export, BIF_P, res_acc, BIF_ARG_2); } } /* * The actual processes/0 BIF. */ BIF_RETTYPE processes_0(BIF_ALIST_0) { /* * A requirement: The list of pids returned should be a consistent * snapshot of all processes existing at some point * in time during the execution of processes/0. Since * processes might terminate while processes/0 is * executing, we have to keep track of terminated * processes and add them to the result. We also * ignore processes created after processes/0 has * begun executing. */ Eterm res_acc = NIL; Binary *mbp = erts_create_magic_binary(sizeof(ErtsProcessesBifData), cleanup_processes_bif_data); ErtsProcessesBifData *pbdp = ERTS_MAGIC_BIN_DATA(mbp); ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_0, call); pbdp->state = INITIALIZING; ERTS_PROCS_DBG_INIT(BIF_P, pbdp); if (ERTS_BIF_REDS_LEFT(BIF_P) >= ERTS_PROCESSES_BIF_MIN_START_REDS && processes_bif_engine(BIF_P, &res_acc, mbp)) { erts_bin_free(mbp); ERTS_PROCS_DBG_CHK_RESLIST(res_acc); ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_0, return); BIF_RET(res_acc); } else { Eterm *hp; Eterm magic_bin; ERTS_PROCS_DBG_CHK_RESLIST(res_acc); hp = HAlloc(BIF_P, PROC_BIN_SIZE); ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(pbdp, hp, PROC_BIN_SIZE); magic_bin = erts_mk_magic_binary_term(&hp, &MSO(BIF_P), mbp); ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(pbdp, hp); ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_0, trap); ERTS_BIF_YIELD2(&processes_trap_export, BIF_P, res_acc, magic_bin); } } static void init_processes_bif(void) { saved_term_procs.start = NULL; saved_term_procs.end = NULL; processes_bif_tab_chunks = (((erts_max_processes - 1) / ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE) + 1); /* processes_trap/2 is a hidden BIF that the processes/0 BIF traps to. */ sys_memset((void *) &processes_trap_export, 0, sizeof(Export)); processes_trap_export.address = &processes_trap_export.code[3]; processes_trap_export.code[0] = am_erlang; processes_trap_export.code[1] = am_processes_trap; processes_trap_export.code[2] = 2; processes_trap_export.code[3] = (BeamInstr) em_apply_bif; processes_trap_export.code[4] = (BeamInstr) &processes_trap; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST erts_get_emu_time(&debug_tv_start); #endif } /* * Debug stuff */ Eterm erts_debug_processes(Process *c_p) { /* This is the old processes/0 BIF. */ int i; Uint need; Eterm res; Eterm* hp; Process *p; #ifdef DEBUG Eterm *hp_end; #endif erts_smp_mtx_lock(&proc_tab_mtx); res = NIL; need = erts_process_count() * 2; hp = HAlloc(c_p, need); /* we need two heap words for each pid */ #ifdef DEBUG hp_end = hp + need; #endif /* make the list by scanning bakward */ for (i = erts_max_processes-1; i >= 0; i--) { if ((p = process_tab[i]) != NULL) { res = CONS(hp, process_tab[i]->id, res); hp += 2; } } ASSERT(hp == hp_end); erts_smp_mtx_unlock(&proc_tab_mtx); return res; } Eterm erts_debug_processes_bif_info(Process *c_p) { ERTS_DECL_AM(processes_bif_info); Eterm elements[] = { AM_processes_bif_info, make_small((Uint) ERTS_PROCESSES_BIF_MIN_START_REDS), make_small((Uint) processes_bif_tab_chunks), make_small((Uint) ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE), make_small((Uint) ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED), make_small((Uint) ERTS_PROCESSES_BIF_TAB_FREE_TERM_PROC_REDS), make_small((Uint) ERTS_PROCESSES_BIF_INSPECT_TERM_PROC_PER_RED), make_small((Uint) ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS), make_small((Uint) ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED), make_small((Uint) ERTS_PROCESSES_BIF_DEBUGLEVEL) }; Uint sz = 0; Eterm *hp; (void) erts_bld_tuplev(NULL, &sz, sizeof(elements)/sizeof(Eterm), elements); hp = HAlloc(c_p, sz); return erts_bld_tuplev(&hp, NULL, sizeof(elements)/sizeof(Eterm), elements); } #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS static void debug_processes_check_found_pid(ErtsProcessesBifData *pbdp, Eterm pid, SysTimeval *tvp, int pid_should_be_found) { int i; for (i = 0; i < pbdp->pid_ix; i++) { if (pbdp->pid[i] == pid && pbdp->debug.pid_started[i].tv_sec == tvp->tv_sec && pbdp->debug.pid_started[i].tv_usec == tvp->tv_usec) { ERTS_PROCS_ASSERT(pid_should_be_found); return; } } ERTS_PROCS_ASSERT(!pid_should_be_found); } #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_RESLIST static void debug_processes_check_res_list(Eterm list) { while (is_list(list)) { Eterm* consp = list_val(list); Eterm hd = CAR(consp); ERTS_PROCS_ASSERT(is_internal_pid(hd)); list = CDR(consp); } ERTS_PROCS_ASSERT(is_nil(list)); } #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS static void debug_processes_save_all_pids(ErtsProcessesBifData *pbdp) { int ix, tix, cpix; pbdp->debug.correct_pids_verified = 0; pbdp->debug.correct_pids = erts_alloc(ERTS_ALC_T_PROCS_PIDS, sizeof(Eterm)*pbdp->pid_sz); for (tix = 0, cpix = 0; tix < erts_max_processes; tix++) { Process *rp = process_tab[tix]; if (rp) { ERTS_PROCS_ASSERT(is_internal_pid(rp->id)); pbdp->debug.correct_pids[cpix++] = rp->id; ERTS_PROCS_ASSERT(cpix <= pbdp->pid_sz); } } ERTS_PROCS_ASSERT(cpix == pbdp->pid_sz); for (ix = 0; ix < pbdp->pid_sz; ix++) pbdp->pid[ix] = make_small(ix); } static void debug_processes_verify_all_pids(ErtsProcessesBifData *pbdp) { int ix, cpix; ERTS_PROCS_ASSERT(pbdp->pid_ix == pbdp->pid_sz); for (ix = 0; ix < pbdp->pid_sz; ix++) { int found = 0; Eterm pid = pbdp->pid[ix]; ERTS_PROCS_ASSERT(is_internal_pid(pid)); for (cpix = ix; cpix < pbdp->pid_sz; cpix++) { if (pbdp->debug.correct_pids[cpix] == pid) { pbdp->debug.correct_pids[cpix] = NIL; found = 1; break; } } if (!found) { for (cpix = 0; cpix < ix; cpix++) { if (pbdp->debug.correct_pids[cpix] == pid) { pbdp->debug.correct_pids[cpix] = NIL; found = 1; break; } } } ERTS_PROCS_ASSERT(found); } pbdp->debug.correct_pids_verified = 1; erts_free(ERTS_ALC_T_PROCS_PIDS, pbdp->debug.correct_pids); pbdp->debug.correct_pids = NULL; } #endif /* ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS */ #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST static void debug_processes_check_term_proc_list(void) { ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&proc_tab_mtx)); if (!saved_term_procs.start) ERTS_PROCS_ASSERT(!saved_term_procs.end); else { SysTimeval tv_now; SysTimeval *prev_xtvp = NULL; ErtsTermProcElement *tpep; erts_get_emu_time(&tv_now); for (tpep = saved_term_procs.start; tpep; tpep = tpep->next) { if (!tpep->prev) ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); else ERTS_PROCS_ASSERT(tpep->prev->next == tpep); if (!tpep->next) ERTS_PROCS_ASSERT(saved_term_procs.end == tpep); else ERTS_PROCS_ASSERT(tpep->next->prev == tpep); if (tpep->ix < 0) { SysTimeval *tvp = &tpep->u.bif_invocation.time; ERTS_PROCS_ASSERT(erts_cmp_timeval(&debug_tv_start, tvp) < 0 && erts_cmp_timeval(tvp, &tv_now) < 0); } else { SysTimeval *stvp = &tpep->u.process.spawned; SysTimeval *xtvp = &tpep->u.process.exited; ERTS_PROCS_ASSERT(erts_cmp_timeval(&debug_tv_start, stvp) < 0); ERTS_PROCS_ASSERT(erts_cmp_timeval(stvp, xtvp) < 0); if (prev_xtvp) ERTS_PROCS_ASSERT(erts_cmp_timeval(prev_xtvp, xtvp) < 0); prev_xtvp = xtvp; ERTS_PROCS_ASSERT(is_internal_pid(tpep->u.process.pid)); ERTS_PROCS_ASSERT(tpep->ix == internal_pid_index(tpep->u.process.pid)); } } } } static void debug_processes_check_term_proc_free_list(ErtsTermProcElement *free_list) { if (saved_term_procs.start) { ErtsTermProcElement *ftpep; ErtsTermProcElement *tpep; for (ftpep = free_list; ftpep; ftpep = ftpep->next) { for (tpep = saved_term_procs.start; tpep; tpep = tpep->next) ERTS_PROCS_ASSERT(ftpep != tpep); } } } #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL != 0 static void debug_processes_assert_error(char* expr, char* file, int line) { fflush(stdout); erts_fprintf(stderr, "%s:%d: Assertion failed: %s\n", file, line, expr); fflush(stderr); abort(); } #endif /* *\ * End of the processes/0 BIF implementation. * \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */