diff options
Diffstat (limited to 'erts/emulator/beam/erl_proc_sig_queue.c')
| -rw-r--r-- | erts/emulator/beam/erl_proc_sig_queue.c | 4405 |
1 files changed, 4405 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_proc_sig_queue.c b/erts/emulator/beam/erl_proc_sig_queue.c new file mode 100644 index 0000000000..5165cd22a5 --- /dev/null +++ b/erts/emulator/beam/erl_proc_sig_queue.c @@ -0,0 +1,4405 @@ +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB 2018. All Rights Reserved. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * %CopyrightEnd% + */ + +/* + * Description: Process signal queue implementation. + * + * Author: Rickard Green + */ + + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include "sys.h" +#include "global.h" +#include "dist.h" +#include "erl_process.h" +#include "erl_port_task.h" +#include "erl_trace.h" +#include "beam_bp.h" +#include "big.h" +#include "erl_gc.h" +#include "bif.h" +#include "erl_proc_sig_queue.h" +#include "dtrace-wrapper.h" + +#define ERTS_SIG_REDS_CNT_FACTOR 4 +#define ERTS_PROC_SIG_TRACE_COUNT_LIMIT 200 + +/* + * Note that not all signal are handled using this functionality! + */ + +#define ERTS_SIG_Q_OP_MAX 11 + +#define ERTS_SIG_Q_OP_EXIT 0 +#define ERTS_SIG_Q_OP_EXIT_LINKED 1 +#define ERTS_SIG_Q_OP_MONITOR_DOWN 2 +#define ERTS_SIG_Q_OP_MONITOR 3 +#define ERTS_SIG_Q_OP_DEMONITOR 4 +#define ERTS_SIG_Q_OP_LINK 5 +#define ERTS_SIG_Q_OP_UNLINK 6 +#define ERTS_SIG_Q_OP_GROUP_LEADER 7 +#define ERTS_SIG_Q_OP_TRACE_CHANGE_STATE 8 +#define ERTS_SIG_Q_OP_PERSISTENT_MON_MSG 9 +#define ERTS_SIG_Q_OP_IS_ALIVE 10 +#define ERTS_SIG_Q_OP_PROCESS_INFO ERTS_SIG_Q_OP_MAX + +#define ERTS_SIG_Q_TYPE_MAX (ERTS_MON_LNK_TYPE_MAX + 5) + +#define ERTS_SIG_Q_TYPE_UNDEFINED \ + (ERTS_MON_LNK_TYPE_MAX + 1) +#define ERTS_SIG_Q_TYPE_DIST_LINK \ + (ERTS_MON_LNK_TYPE_MAX + 2) +#define ERTS_SIG_Q_TYPE_GEN_EXIT \ + (ERTS_MON_LNK_TYPE_MAX + 3) +#define ERTS_SIG_Q_TYPE_DIST_PROC_DEMONITOR \ + (ERTS_MON_LNK_TYPE_MAX + 4) +#define ERTS_SIG_Q_TYPE_ADJUST_TRACE_INFO \ + ERTS_SIG_Q_TYPE_MAX + +Process *ERTS_WRITE_UNLIKELY(erts_dirty_process_signal_handler); +Process *ERTS_WRITE_UNLIKELY(erts_dirty_process_signal_handler_high); +Process *ERTS_WRITE_UNLIKELY(erts_dirty_process_signal_handler_max); + +void +erts_proc_sig_queue_init(void) +{ + ERTS_CT_ASSERT(ERTS_SIG_Q_OP_MASK > ERTS_SIG_Q_OP_MAX); + ERTS_CT_ASSERT(ERTS_SIG_Q_OP_MSGQ_LEN_OFFS_MARK > ERTS_SIG_Q_OP_MAX); + ERTS_CT_ASSERT(ERTS_SIG_Q_TYPE_MASK >= ERTS_SIG_Q_TYPE_MAX); +} + +typedef struct { + int active; + int procs; + struct { + int active; +#if defined(USE_VM_PROBES) + int vm_probes; + char receiver_name[DTRACE_TERM_BUF_SIZE]; +#endif + int receive_trace; + int bp_ix; + ErtsMessage **next; + ErtsTracingEvent *event; + } messages; +} ErtsSigRecvTracing; + +typedef struct { + Eterm message; + Eterm from; + Eterm reason; + union { + Eterm ref; + int normal_kills; + } u; +} ErtsExitSignalData; + +typedef struct { + Eterm message; + Eterm key; +} ErtsPersistMonMsg; + +typedef struct { + ErtsSignalCommon common; + Eterm local; /* internal pid (immediate) */ + Eterm remote; /* external pid (heap for it follow) */ + Eterm heap[EXTERNAL_THING_HEAD_SIZE + 1]; +} ErtsSigDistLinkOp; + +typedef struct { + ErtsSignalCommon common; + Uint flags_on; + Uint flags_off; + Eterm tracer; +} ErtsSigTraceInfo; + +#define ERTS_SIG_GL_FLG_ACTIVE (((erts_aint_t) 1) << 0) +#define ERTS_SIG_GL_FLG_RECEIVER (((erts_aint_t) 1) << 1) +#define ERTS_SIG_GL_FLG_SENDER (((erts_aint_t) 1) << 2) + +typedef struct { + ErtsSignalCommon common; + erts_atomic_t flags; + Eterm group_leader; + Eterm reply_to; + Eterm ref; + ErlOffHeap oh; + Eterm heap[1]; +} ErtsSigGroupLeader; + +typedef struct { + Eterm message; + Eterm requester; +} ErtsIsAliveRequest; + +typedef struct { + ErtsSignalCommon common; + Sint refc; + Sint delayed_len; + Sint len_offset; +} ErtsProcSigMsgQLenOffsetMarker; + +typedef struct { + ErtsSignalCommon common; + ErtsProcSigMsgQLenOffsetMarker marker; + Sint msgq_len_offset; + Eterm requester; + Eterm ref; + ErtsORefThing oref_thing; + Uint reserve_size; + Uint len; + int flags; + int item_ix[1]; /* of len size in reality... */ +} ErtsProcessInfoSig; + +#define ERTS_PROC_SIG_PI_MSGQ_LEN_IGNORE ((Sint) -1) +#define ERTS_PROC_SIG_PI_MSGQ_LEN_SYNC ((Sint) -2) + +static int handle_msg_tracing(Process *c_p, + ErtsSigRecvTracing *tracing, + ErtsMessage ***next_nm_sig); +static int handle_trace_change_state(Process *c_p, + ErtsSigRecvTracing *tracing, + Uint16 type, + ErtsMessage *sig, + ErtsMessage ***next_nm_sig); +static void getting_unlinked(Process *c_p, Eterm unlinker); +static void getting_linked(Process *c_p, Eterm linker); +static void group_leader_reply(Process *c_p, Eterm to, + Eterm ref, int success); +static int stretch_limit(Process *c_p, ErtsSigRecvTracing *tp, + int abs_lim, int *limp); + +#ifdef ERTS_PROC_SIG_HARD_DEBUG +#define ERTS_PROC_SIG_HDBG_PRIV_CHKQ(P, T, NMN) \ + do { \ + ErtsMessage **nm_next__ = *(NMN); \ + ErtsMessage **nm_last__ = (P)->sig_qs.nmsigs.last; \ + if (!nm_next__ || !*nm_next__) { \ + nm_next__ = NULL; \ + nm_last__ = NULL; \ + } \ + proc_sig_hdbg_check_queue((P), \ + 1, \ + &(P)->sig_qs.cont, \ + (P)->sig_qs.cont_last, \ + nm_next__, \ + nm_last__, \ + (T), \ + NULL, \ + ERTS_PSFLG_FREE); \ + } while (0); +static Sint +proc_sig_hdbg_check_queue(Process *c_p, + int privq, + ErtsMessage **sig_next, + ErtsMessage **sig_last, + ErtsMessage **sig_nm_next, + ErtsMessage **sig_nm_last, + ErtsSigRecvTracing *tracing, + int *found_saved_last_p, + erts_aint32_t sig_psflg); +#else +#define ERTS_PROC_SIG_HDBG_PRIV_CHKQ(P, T, NMN) +#endif + +typedef struct { + ErtsSignalCommon common; + Eterm ref; + Eterm heap[1]; +} ErtsSigDistProcDemonitor; + +static void +destroy_dist_proc_demonitor(ErtsSigDistProcDemonitor *dmon) +{ + Eterm ref = dmon->ref; + if (is_external(ref)) { + ExternalThing *etp = external_thing_ptr(ref); + erts_deref_node_entry(etp->node); + } + erts_free(ERTS_ALC_T_DIST_DEMONITOR, dmon); +} + +static ERTS_INLINE ErtsSigDistLinkOp * +make_sig_dist_link_op(int op, Eterm local, Eterm remote) +{ + Eterm *hp; + ErlOffHeap oh = {0}; + ErtsSigDistLinkOp *sdlnk = erts_alloc(ERTS_ALC_T_SIG_DATA, + sizeof(ErtsSigDistLinkOp)); + ASSERT(is_internal_pid(local)); + ASSERT(is_external_pid(remote)); + + hp = &sdlnk->heap[0]; + + sdlnk->common.tag = ERTS_PROC_SIG_MAKE_TAG(op, + ERTS_SIG_Q_TYPE_DIST_LINK, + 0); + sdlnk->local = local; + sdlnk->remote = STORE_NC(&hp, &oh, remote); + + ASSERT(&sdlnk->heap[0] < hp); + ASSERT(hp <= &sdlnk->heap[0] + sizeof(sdlnk->heap)/sizeof(sdlnk->heap[0])); + ASSERT(boxed_val(sdlnk->remote) == &sdlnk->heap[0]); + + return sdlnk; +} + +static ERTS_INLINE void +destroy_sig_dist_link_op(ErtsSigDistLinkOp *sdlnk) +{ + ASSERT(is_external_pid(sdlnk->remote)); + ASSERT(boxed_val(sdlnk->remote) == &sdlnk->heap[0]); + erts_deref_node_entry(((ExternalThing *) &sdlnk->heap[0])->node); + erts_free(ERTS_ALC_T_SIG_DATA, sdlnk); +} + +static ERTS_INLINE ErtsExitSignalData * +get_exit_signal_data(ErtsMessage *xsig) +{ + ASSERT(ERTS_SIG_IS_NON_MSG(xsig)); + ASSERT((ERTS_PROC_SIG_OP(((ErtsSignal *) xsig)->common.tag) + == ERTS_SIG_Q_OP_EXIT) + || (ERTS_PROC_SIG_OP(((ErtsSignal *) xsig)->common.tag) + == ERTS_SIG_Q_OP_EXIT_LINKED) + || (ERTS_PROC_SIG_OP(((ErtsSignal *) xsig)->common.tag) + == ERTS_SIG_Q_OP_MONITOR_DOWN)); + ASSERT(xsig->hfrag.alloc_size > xsig->hfrag.used_size); + ASSERT((xsig->hfrag.alloc_size - xsig->hfrag.used_size)*sizeof(UWord) + >= sizeof(ErtsExitSignalData)); + return (ErtsExitSignalData *) (char *) (&xsig->hfrag.mem[0] + + xsig->hfrag.used_size); +} + +static ERTS_INLINE void +destroy_trace_info(ErtsSigTraceInfo *ti) +{ + if (is_value(ti->tracer)) + erts_tracer_update(&ti->tracer, NIL); + erts_free(ERTS_ALC_T_SIG_DATA, ti); +} + +static void +destroy_sig_group_leader(ErtsSigGroupLeader *sgl) +{ + erts_cleanup_offheap(&sgl->oh); + erts_free(ERTS_ALC_T_SIG_DATA, sgl); +} + +static ERTS_INLINE void +sig_enqueue_trace(Process *c_p, ErtsMessage **sigp, int op, + Process *rp, ErtsMessage ***last_next) +{ + switch (op) { + case ERTS_SIG_Q_OP_LINK: + if (c_p + && ((!!IS_TRACED(c_p)) + & (ERTS_TRACE_FLAGS(c_p) & (F_TRACE_SOL + | F_TRACE_SOL1)))) { + ErtsSigTraceInfo *ti; + Eterm tag; + /* + * Set on link enabled. + * + * Prepend a trace-change-state signal before the + * link signal... + */ + tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_TRACE_CHANGE_STATE, + ERTS_SIG_Q_TYPE_ADJUST_TRACE_INFO, + 0); + ti = erts_alloc(ERTS_ALC_T_SIG_DATA, sizeof(ErtsSigTraceInfo)); + ti->common.next = *sigp; + ti->common.specific.next = &ti->common.next; + ti->common.tag = tag; + ti->flags_on = ERTS_TRACE_FLAGS(c_p) & TRACEE_FLAGS; + if (!(ti->flags_on & F_TRACE_SOL1)) + ti->flags_off = 0; + else { + ti->flags_off = F_TRACE_SOL1|F_TRACE_SOL; + erts_proc_lock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); + ERTS_TRACE_FLAGS(c_p) &= ~(F_TRACE_SOL1|F_TRACE_SOL); + erts_proc_unlock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); + } + erts_tracer_update(&ti->tracer, ERTS_TRACER(c_p)); + *sigp = (ErtsMessage *) ti; + if (!*last_next || *last_next == sigp) + *last_next = &ti->common.next; + } + break; + +#ifdef USE_VM_PROBES + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: + + if (DTRACE_ENABLED(process_exit_signal)) { + ErtsMessage* sig = *sigp; + Uint16 type = ERTS_PROC_SIG_TYPE(((ErtsSignal *) sig)->common.tag); + Eterm reason, from; + + if (type == ERTS_SIG_Q_TYPE_GEN_EXIT) { + ErtsExitSignalData *xsigd = get_exit_signal_data(sig); + reason = xsigd->reason; + from = xsigd->from; + } + else { + ErtsLink *lnk = (ErtsLink *) sig, *olnk; + + ASSERT(type == ERTS_LNK_TYPE_PROC + || type == ERTS_LNK_TYPE_PORT + || type == ERTS_LNK_TYPE_DIST_PROC); + + olnk = erts_link_to_other(lnk, NULL); + reason = lnk->other.item; + from = olnk->other.item; + } + + if (is_pid(from)) { + + DTRACE_CHARBUF(sender_str, DTRACE_TERM_BUF_SIZE); + DTRACE_CHARBUF(receiver_str, DTRACE_TERM_BUF_SIZE); + DTRACE_CHARBUF(reason_buf, DTRACE_TERM_BUF_SIZE); + + if (reason == am_kill) { + reason = am_killed; + } + + dtrace_pid_str(from, sender_str); + dtrace_proc_str(rp, receiver_str); + erts_snprintf(reason_buf, sizeof(DTRACE_CHARBUF_NAME(reason_buf)) - 1, "%T", reason); + DTRACE3(process_exit_signal, sender_str, receiver_str, reason_buf); + } + } + break; + +#endif + + default: + break; + } +} + +static void +sig_enqueue_trace_cleanup(ErtsMessage *first, ErtsSignal *sig, ErtsMessage *last) +{ + ErtsMessage *tmp; + + /* The usual case; no tracing signals... */ + if (sig == (ErtsSignal *) first && sig == (ErtsSignal *) last) { + sig->common.next = NULL; + return; + } + + /* Got trace signals to clean up... */ + + tmp = first; + + while (tmp) { + ErtsMessage *tmp_free = tmp; + tmp = tmp->next; + if (sig != (ErtsSignal *) tmp_free) { + switch (ERTS_PROC_SIG_OP(((ErtsSignal *) tmp_free)->common.tag)) { + case ERTS_SIG_Q_OP_TRACE_CHANGE_STATE: + destroy_trace_info((ErtsSigTraceInfo *) tmp_free); + break; + default: + ERTS_INTERNAL_ERROR("Unexpected signal op"); + break; + } + } + } +} + +#ifdef DEBUG +static int dbg_count_nmsigs(ErtsMessage *first) +{ + ErtsMessage *sig; + int cnt = 0; + + for (sig = first; sig; sig = sig->next) { + if (ERTS_SIG_IS_NON_MSG(sig)) + ++cnt; + } + return cnt; +} +#endif + +static ERTS_INLINE erts_aint32_t +enqueue_signals(Process *rp, ErtsMessage *first, + ErtsMessage **last, ErtsMessage **last_next, + Uint num_msgs, + erts_aint32_t in_state) +{ + erts_aint32_t state = in_state; + ErtsMessage **this = rp->sig_inq.last; + + ERTS_HDBG_CHECK_SIGNAL_IN_QUEUE(rp); + + ASSERT(!*this); + *this = first; + rp->sig_inq.last = last; + + if (!rp->sig_inq.nmsigs.next) { + ASSERT(!rp->sig_inq.nmsigs.last); + if (ERTS_SIG_IS_NON_MSG(first)) { + rp->sig_inq.nmsigs.next = this; + } + else if (last_next) { + ASSERT(first->next && ERTS_SIG_IS_NON_MSG(first->next)); + rp->sig_inq.nmsigs.next = &first->next; + } + else + goto no_nmsig; + + state = erts_atomic32_read_bor_nob(&rp->state, + ERTS_PSFLG_SIG_IN_Q); + no_nmsig: + ASSERT(!(state & ERTS_PSFLG_SIG_IN_Q)); + } + else { + ErtsSignal *sig; + ASSERT(rp->sig_inq.nmsigs.last); + + sig = (ErtsSignal *) *rp->sig_inq.nmsigs.last; + + ASSERT(sig && !sig->common.specific.next); + ASSERT(state & ERTS_PSFLG_SIG_IN_Q); + if (ERTS_SIG_IS_NON_MSG(first)) { + sig->common.specific.next = this; + } + else if (last_next) { + ASSERT(first->next && ERTS_SIG_IS_NON_MSG(first->next)); + sig->common.specific.next = &first->next; + } + } + + if (last_next) { + ASSERT(dbg_count_nmsigs(first) >= 2); + rp->sig_inq.nmsigs.last = last_next; + } + else if (ERTS_SIG_IS_NON_MSG(first)) { + ASSERT(dbg_count_nmsigs(first) == 1); + rp->sig_inq.nmsigs.last = this; + } + else + ASSERT(dbg_count_nmsigs(first) == 0); + + rp->sig_inq.len += num_msgs; + + ERTS_HDBG_CHECK_SIGNAL_IN_QUEUE(rp); + + return state; +} + +erts_aint32_t erts_enqueue_signals(Process *rp, ErtsMessage *first, + ErtsMessage **last, ErtsMessage **last_next, + Uint num_msgs, + erts_aint32_t in_state) +{ + return enqueue_signals(rp, first, last, last_next, num_msgs, in_state); +} + +static ERTS_INLINE void +ensure_dirty_proc_handled(Eterm pid, + erts_aint32_t state, + erts_aint32_t prio) +{ + if (state & (ERTS_PSFLG_DIRTY_RUNNING + | ERTS_PSFLG_DIRTY_RUNNING_SYS)) { + Eterm *hp; + ErtsMessage *mp; + Process *sig_handler; + + if (prio < 0) + prio = (int) ERTS_PSFLGS_GET_USR_PRIO(state); + + switch (prio) { + case PRIORITY_MAX: + sig_handler = erts_dirty_process_signal_handler_max; + break; + case PRIORITY_HIGH: + sig_handler = erts_dirty_process_signal_handler_high; + break; + default: + sig_handler = erts_dirty_process_signal_handler; + break; + } + + /* Make sure signals are handled... */ + mp = erts_alloc_message(0, &hp); + erts_queue_message(sig_handler, 0, mp, pid, am_system); + } +} + +static void +check_push_msgq_len_offs_marker(Process *rp, ErtsSignal *sig); + +static int +proc_queue_signal(Process *c_p, Eterm pid, ErtsSignal *sig, int op) +{ + int res; + Process *rp; + ErtsMessage *first, *last, **last_next, **sigp; + ErtsSchedulerData *esdp = erts_get_scheduler_data(); + int is_normal_sched = !!esdp && esdp->type == ERTS_SCHED_NORMAL; + erts_aint32_t state; + ErtsSignal *pend_sig; + + if (is_normal_sched) { + pend_sig = esdp->pending_signal.sig; + if (op == ERTS_SIG_Q_OP_MONITOR + && ((ErtsMonitor*)sig)->type == ERTS_MON_TYPE_PROC) { + + if (!pend_sig) { + esdp->pending_signal.sig = sig; + esdp->pending_signal.to = pid; +#ifdef DEBUG + esdp->pending_signal.dbg_from = esdp->current_process; +#endif + return 1; + } + ASSERT(esdp->pending_signal.dbg_from == esdp->current_process); + if (pend_sig != sig) { + /* Switch them and send previously pending signal instead */ + Eterm pend_to = esdp->pending_signal.to; + esdp->pending_signal.sig = sig; + esdp->pending_signal.to = pid; + sig = pend_sig; + pid = pend_to; + } + else { + /* Caller wants to flush pending signal */ + ASSERT(pid == esdp->pending_signal.to); + esdp->pending_signal.sig = NULL; + esdp->pending_signal.to = THE_NON_VALUE; +#ifdef DEBUG + esdp->pending_signal.dbg_from = NULL; +#endif + pend_sig = NULL; + } + rp = erts_proc_lookup_raw(pid); + if (!rp) { + erts_proc_sig_send_monitor_down((ErtsMonitor*)sig, am_noproc); + return 1; + } + } + else if (pend_sig && pid == esdp->pending_signal.to) { + /* Flush pending signal to maintain signal order */ + esdp->pending_signal.sig = NULL; + esdp->pending_signal.to = THE_NON_VALUE; + + rp = erts_proc_lookup_raw(pid); + if (!rp) { + erts_proc_sig_send_monitor_down((ErtsMonitor*)pend_sig, am_noproc); + return 0; + } + + /* Prepend pending signal */ + pend_sig->common.next = (ErtsMessage*) sig; + pend_sig->common.specific.next = &pend_sig->common.next; + first = (ErtsMessage*) pend_sig; + last = (ErtsMessage*) sig; + sigp = last_next = &pend_sig->common.next; + goto first_last_done; + } + else { + pend_sig = NULL; + rp = erts_proc_lookup_raw(pid); + if (!rp) + return 0; + } + } + else { + rp = erts_proc_lookup_raw_inc_refc(pid); + if (!rp) + return 0; + pend_sig = NULL; + } + + first = last = (ErtsMessage *) sig; + last_next = NULL; + sigp = &first; + +first_last_done: + sig->common.specific.next = NULL; + + /* may add signals before and/or after sig */ + sig_enqueue_trace(c_p, sigp, op, rp, &last_next); + + last->next = NULL; + + erts_proc_lock(rp, ERTS_PROC_LOCK_MSGQ); + + state = erts_atomic32_read_nob(&rp->state); + + if (ERTS_PSFLG_FREE & state) + res = 0; + else { + state = enqueue_signals(rp, first, &last->next, last_next, 0, state); + if (ERTS_UNLIKELY(op == ERTS_SIG_Q_OP_PROCESS_INFO)) + check_push_msgq_len_offs_marker(rp, sig); + res = !0; + } + + erts_proc_unlock(rp, ERTS_PROC_LOCK_MSGQ); + + if (res == 0) { + if (pend_sig) { + if (sig == pend_sig) { + /* We did a switch, callers signal is now pending (still ok) */ + ASSERT(esdp->pending_signal.sig); + res = 1; + } + else { + ASSERT(first == (ErtsMessage*)pend_sig); + first = first->next; + } + erts_proc_sig_send_monitor_down((ErtsMonitor*)pend_sig, am_noproc); + } + sig_enqueue_trace_cleanup(first, sig, last); + } + + if (!(state & (ERTS_PSFLG_EXITING + | ERTS_PSFLG_ACTIVE_SYS + | ERTS_PSFLG_SIG_IN_Q))) { + /* Schedule process... */ + state = erts_proc_sys_schedule(rp, state, 0); + } + + ensure_dirty_proc_handled(rp->common.id, state, -1); + + if (!is_normal_sched) + erts_proc_dec_refc(rp); + + return res; +} + +void erts_proc_sig_send_pending(ErtsSchedulerData* esdp) +{ + ErtsSignal* sig = esdp->pending_signal.sig; + int op; + + ASSERT(esdp && esdp->type == ERTS_SCHED_NORMAL); + ASSERT(sig); + ASSERT(is_internal_pid(esdp->pending_signal.to)); + + op = ERTS_SIG_Q_OP_MONITOR; + ASSERT(op == ERTS_PROC_SIG_OP(sig->common.tag)); + + if (!proc_queue_signal(NULL, esdp->pending_signal.to, sig, op)) { + ErtsMonitor* mon = (ErtsMonitor*)sig; + erts_proc_sig_send_monitor_down(mon, am_noproc); + } +} + +static int +maybe_elevate_sig_handling_prio(Process *c_p, Eterm other) +{ + /* + * returns: + * > 0 -> elevated prio; process alive or exiting + * < 0 -> no elevation needed; process alive or exiting + * 0 -> process terminated (free) + */ + int res; + Process *rp; + erts_aint32_t state, my_prio, other_prio; + + rp = erts_proc_lookup_raw(other); + if (!rp) + res = 0; + else { + res = -1; + state = erts_atomic32_read_nob(&c_p->state); + my_prio = ERTS_PSFLGS_GET_USR_PRIO(state); + + state = erts_atomic32_read_nob(&rp->state); + other_prio = ERTS_PSFLGS_GET_USR_PRIO(state); + + if (other_prio > my_prio) { + /* Others prio is lower than mine; elevate it... */ + res = !!erts_sig_prio(other, my_prio); + if (res) { + /* ensure handled if dirty executing... */ + state = erts_atomic32_read_nob(&rp->state); + ensure_dirty_proc_handled(other, state, my_prio); + } + } + } + return res; +} + +void +erts_proc_sig_fetch__(Process *proc) +{ + ASSERT(proc->sig_inq.first); + + if (!proc->sig_inq.nmsigs.next) { + ASSERT(!(ERTS_PSFLG_SIG_IN_Q + & erts_atomic32_read_nob(&proc->state))); + ASSERT(!proc->sig_inq.nmsigs.last); + + if (proc->sig_qs.cont || ERTS_MSG_RECV_TRACED(proc)) { + *proc->sig_qs.cont_last = proc->sig_inq.first; + proc->sig_qs.cont_last = proc->sig_inq.last; + } + else { + *proc->sig_qs.last = proc->sig_inq.first; + proc->sig_qs.last = proc->sig_inq.last; + } + } + else { + erts_aint32_t s; + ASSERT(proc->sig_inq.nmsigs.last); + if (!proc->sig_qs.nmsigs.last) { + ASSERT(!proc->sig_qs.nmsigs.next); + if (proc->sig_inq.nmsigs.next == &proc->sig_inq.first) + proc->sig_qs.nmsigs.next = proc->sig_qs.cont_last; + else + proc->sig_qs.nmsigs.next = proc->sig_inq.nmsigs.next; + + s = erts_atomic32_read_bset_nob(&proc->state, + (ERTS_PSFLG_SIG_Q + | ERTS_PSFLG_SIG_IN_Q), + ERTS_PSFLG_SIG_Q); + + ASSERT((s & (ERTS_PSFLG_SIG_Q|ERTS_PSFLG_SIG_IN_Q)) + == ERTS_PSFLG_SIG_IN_Q); (void)s; + } + else { + ErtsSignal *sig; + ASSERT(proc->sig_qs.nmsigs.next); + sig = ((ErtsSignal *) *proc->sig_qs.nmsigs.last); + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + ASSERT(!sig->common.specific.next); + if (proc->sig_inq.nmsigs.next == &proc->sig_inq.first) + sig->common.specific.next = proc->sig_qs.cont_last; + else + sig->common.specific.next = proc->sig_inq.nmsigs.next; + + s = erts_atomic32_read_band_nob(&proc->state, + ~ERTS_PSFLG_SIG_IN_Q); + + ASSERT((s & (ERTS_PSFLG_SIG_Q|ERTS_PSFLG_SIG_IN_Q)) + == (ERTS_PSFLG_SIG_Q|ERTS_PSFLG_SIG_IN_Q)); (void)s; + } + if (proc->sig_inq.nmsigs.last == &proc->sig_inq.first) + proc->sig_qs.nmsigs.last = proc->sig_qs.cont_last; + else + proc->sig_qs.nmsigs.last = proc->sig_inq.nmsigs.last; + proc->sig_inq.nmsigs.next = NULL; + proc->sig_inq.nmsigs.last = NULL; + + *proc->sig_qs.cont_last = proc->sig_inq.first; + proc->sig_qs.cont_last = proc->sig_inq.last; + } + + proc->sig_qs.len += proc->sig_inq.len; + + proc->sig_inq.first = NULL; + proc->sig_inq.last = &proc->sig_inq.first; + proc->sig_inq.len = 0; + +} + +Sint +erts_proc_sig_fetch_msgq_len_offs__(Process *proc) +{ + ErtsProcSigMsgQLenOffsetMarker *marker + = (ErtsProcSigMsgQLenOffsetMarker *) proc->sig_inq.first; + + ASSERT(marker->common.tag == ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK); + + if (marker->common.next) { + Sint len; + + proc->flags |= F_DELAYED_PSIGQS_LEN; + + /* + * Prevent update of sig_qs.len in fetch. These + * updates are done via process-info signal(s) + * instead... + */ + len = proc->sig_inq.len; + marker->delayed_len += len; + marker->len_offset -= len; + proc->sig_inq.len = 0; + + /* + * Temorarily remove marker during fetch... + */ + + proc->sig_inq.first = marker->common.next; + if (proc->sig_inq.last == &marker->common.next) + proc->sig_inq.last = &proc->sig_inq.first; + if (proc->sig_inq.nmsigs.next == &marker->common.next) + proc->sig_inq.nmsigs.next = &proc->sig_inq.first; + if (proc->sig_inq.nmsigs.last == &marker->common.next) + proc->sig_inq.nmsigs.last = &proc->sig_inq.first; + + erts_proc_sig_fetch__(proc); + + marker->common.next = NULL; + proc->sig_inq.first = (ErtsMessage *) marker; + proc->sig_inq.last = &marker->common.next; + + } + + return marker->delayed_len; +} + +static ERTS_INLINE Sint +proc_sig_privqs_len(Process *c_p, int have_qlock) +{ + Sint res = c_p->sig_qs.len; + + ERTS_LC_ASSERT(!have_qlock + ? (ERTS_PROC_LOCK_MAIN + == erts_proc_lc_my_proc_locks(c_p)) + : ((ERTS_PROC_LOCK_MSGQ|ERTS_PROC_LOCK_MAIN) + == ((ERTS_PROC_LOCK_MSGQ|ERTS_PROC_LOCK_MAIN) + & erts_proc_lc_my_proc_locks(c_p)))); + + if (c_p->flags & F_DELAYED_PSIGQS_LEN) { + ErtsProcSigMsgQLenOffsetMarker *marker; + + if (!have_qlock) + erts_proc_lock(c_p, ERTS_PROC_LOCK_MSGQ); + + marker = (ErtsProcSigMsgQLenOffsetMarker *) c_p->sig_inq.first; + ASSERT(marker); + ASSERT(marker->common.tag == ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK); + + res += marker->delayed_len; + + if (!have_qlock) + erts_proc_unlock(c_p, ERTS_PROC_LOCK_MSGQ); + } + +#ifdef ERTS_PROC_SIG_HARD_DEBUG_SIGQ_MSG_LEN + { + Sint len = 0; + ERTS_FOREACH_SIG_PRIVQS( + c_p, mp, + { + if (ERTS_SIG_IS_MSG(mp)) + len++; + }); + ERTS_ASSERT(res == len); + } +#endif + + return res; +} + +Sint +erts_proc_sig_privqs_len(Process *c_p) +{ + return proc_sig_privqs_len(c_p, 0); +} + +static void do_seq_trace_output(Eterm to, Eterm token, Eterm msg); + +static void +send_gen_exit_signal(Process *c_p, Eterm from_tag, + Eterm from, Eterm to, + Sint16 op, Eterm reason, Eterm ref, + Eterm token, int normal_kills) +{ + ErtsExitSignalData *xsigd; + Eterm *hp, *start_hp, s_reason, s_ref, s_message, s_token, s_from; + ErtsMessage *mp; + ErlHeapFragment *hfrag; + ErlOffHeap *ohp; + Uint hsz, from_sz, reason_sz, ref_sz, token_sz; + int seq_trace; +#ifdef USE_VM_PROBES + Eterm s_utag, utag; + Uint utag_sz; +#endif + + ASSERT(is_immed(from_tag)); + + hsz = sizeof(ErtsExitSignalData)/sizeof(Uint); + + seq_trace = c_p && have_seqtrace(token); + if (seq_trace) + seq_trace_update_send(c_p); + +#ifdef USE_VM_PROBES + utag_sz = 0; + utag = NIL; + if (c_p && token != NIL && (DT_UTAG_FLAGS(c_p) & DT_UTAG_SPREADING)) { + utag_sz = size_object(DT_UTAG(c_p)); + utag = DT_UTAG(c_p); + } + else if (token == am_have_dt_utag) { + token = NIL; + } + hsz += utag_sz; +#endif + + token_sz = is_immed(token) ? 0 : size_object(token); + hsz += token_sz; + + from_sz = is_immed(from) ? 0 : size_object(from); + hsz += from_sz; + + reason_sz = is_immed(reason) ? 0 : size_object(reason); + hsz += reason_sz; + + switch (op) { + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: { + /* {'EXIT', From, Reason} */ + hsz += 4; /* 3-tuple */ + ref_sz = 0; + break; + } + case ERTS_SIG_Q_OP_MONITOR_DOWN: { + /* {'DOWN', Ref, process, From, Reason} */ + hsz += 6; /* 5-tuple */ + ref_sz = NC_HEAP_SIZE(ref); + hsz += ref_sz; + break; + } + default: + ERTS_INTERNAL_ERROR("Invalid exit signal op"); + break; + } + + /* + * Allocate message combined with heap fragment... + */ + mp = erts_alloc_message(hsz, &hp); + hfrag = &mp->hfrag; + mp->next = NULL; + ohp = &hfrag->off_heap; + start_hp = hp; + + s_token = (is_immed(token) + ? token + : copy_struct(token, token_sz, &hp, ohp)); + + s_reason = (is_immed(reason) + ? reason + : copy_struct(reason, reason_sz, &hp, ohp)); + + s_from = (is_immed(from) + ? from + : copy_struct(from, from_sz, &hp, ohp)); + + if (!ref_sz) + s_ref = NIL; + else + s_ref = STORE_NC(&hp, ohp, ref); + + switch (op) { + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: + /* {'EXIT', From, Reason} */ + s_message = TUPLE3(hp, am_EXIT, s_from, s_reason); + hp += 4; + break; + case ERTS_SIG_Q_OP_MONITOR_DOWN: + /* {'DOWN', Ref, process, From, Reason} */ + s_message = TUPLE5(hp, am_DOWN, s_ref, am_process, s_from, s_reason); + hp += 6; + break; + } + +#ifdef USE_VM_PROBES + s_utag = (is_immed(utag) + ? utag + : copy_struct(utag, utag_sz, &hp, ohp)); + ERL_MESSAGE_DT_UTAG(mp) = s_utag; +#endif + + ERL_MESSAGE_TERM(mp) = ERTS_PROC_SIG_MAKE_TAG(op, + ERTS_SIG_Q_TYPE_GEN_EXIT, + 0); + ERL_MESSAGE_TOKEN(mp) = s_token; + ERL_MESSAGE_FROM(mp) = from_tag; /* immediate... */ + + hfrag->used_size = hp - start_hp; + + xsigd = (ErtsExitSignalData *) (char *) hp; + + xsigd->message = s_message; + xsigd->from = s_from; + xsigd->reason = s_reason; + if (is_nil(s_ref)) + xsigd->u.normal_kills = normal_kills; + else { + ASSERT(is_ref(s_ref)); + xsigd->u.ref = s_ref; + } + + if (seq_trace) + do_seq_trace_output(to, s_token, s_message); + + if (!proc_queue_signal(c_p, to, (ErtsSignal *) mp, op)) { + mp->next = NULL; + erts_cleanup_messages(mp); + } +} + +static void +do_seq_trace_output(Eterm to, Eterm token, Eterm msg) +{ + /* + * We could do this when enqueuing the signal and avoid some + * locking. However, the enqueuing code would then always + * have the penalty of this seq-tracing code which we do not + * want... + */ + ErtsSchedulerData *esdp = erts_get_scheduler_data(); + int is_normal_sched = !!esdp && esdp->type == ERTS_SCHED_NORMAL; + Process *rp; + + if (is_normal_sched) + rp = erts_proc_lookup_raw(to); + else + rp = erts_proc_lookup_raw_inc_refc(to); + + if (rp) { + erts_proc_lock(rp, ERTS_PROC_LOCK_MSGQ); + + if (!ERTS_PROC_IS_EXITING(rp)) + seq_trace_output(token, msg, SEQ_TRACE_SEND, to, rp); + + erts_proc_unlock(rp, ERTS_PROC_LOCK_MSGQ); + + if (!is_normal_sched) + erts_proc_dec_refc(rp); + } +} + +void +erts_proc_sig_send_persistent_monitor_msg(Uint16 type, Eterm key, + Eterm from, Eterm to, + Eterm msg, Uint msg_sz) +{ + ErtsPersistMonMsg *prst_mon; + ErtsMessage *mp; + ErlHeapFragment *hfrag; + Eterm *hp, *start_hp, message; + ErlOffHeap *ohp; + Uint hsz = sizeof(ErtsPersistMonMsg) + msg_sz; + + /* + * Allocate message combined with heap fragment... + */ + mp = erts_alloc_message(hsz, &hp); + hfrag = &mp->hfrag; + mp->next = NULL; + ohp = &hfrag->off_heap; + start_hp = hp; + + ASSERT(msg_sz == size_object(msg)); + message = copy_struct(msg, msg_sz, &hp, ohp); + hfrag->used_size = hp - start_hp; + + prst_mon = (ErtsPersistMonMsg *) (char *) hp; + prst_mon->message = message; + + switch (type) { + case ERTS_MON_TYPE_NODES: + ASSERT(is_small(key)); + prst_mon->key = key; + break; + + case ERTS_MON_TYPE_TIME_OFFSET: + ASSERT(is_internal_ref(key)); + ASSERT(is_tuple_arity(message, 5)); + + prst_mon->key = tuple_val(message)[2]; + + ASSERT(eq(prst_mon->key, key)); + break; + + default: + ERTS_INTERNAL_ERROR("Invalid persistent monitor type"); + prst_mon->key = key; + break; + } + + ASSERT(is_immed(from)); + + ERL_MESSAGE_TERM(mp) = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_PERSISTENT_MON_MSG, + type, 0); + ERL_MESSAGE_FROM(mp) = from; + ERL_MESSAGE_TOKEN(mp) = NIL; +#ifdef USE_VM_PROBES + ERL_MESSAGE_DT_UTAG(mp) = NIL; +#endif + + if (!proc_queue_signal(NULL, to, (ErtsSignal *) mp, + ERTS_SIG_Q_OP_PERSISTENT_MON_MSG)) { + mp->next = NULL; + erts_cleanup_messages(mp); + } +} + +static ERTS_INLINE Eterm +get_persist_mon_msg(ErtsMessage *sig, Eterm *msg) +{ + ErtsPersistMonMsg *prst_mon; + prst_mon = ((ErtsPersistMonMsg *) + (char *) (&sig->hfrag.mem[0] + + sig->hfrag.used_size)); + *msg = prst_mon->message; + return prst_mon->key; +} + +void +erts_proc_sig_send_exit(Process *c_p, Eterm from, Eterm to, + Eterm reason, Eterm token, + int normal_kills) +{ + Eterm from_tag; + ASSERT(!c_p || c_p->common.id == from); + if (is_immed(from)) { + ASSERT(is_internal_pid(from) || is_internal_port(from)); + from_tag = from; + } + else { + DistEntry *dep; + ASSERT(is_external_pid(from)); + dep = external_pid_dist_entry(from); + from_tag = dep->sysname; + } + send_gen_exit_signal(c_p, from_tag, from, to, ERTS_SIG_Q_OP_EXIT, + reason, NIL, token, normal_kills); +} + +void +erts_proc_sig_send_link_exit(Process *c_p, Eterm from, ErtsLink *lnk, + Eterm reason, Eterm token) +{ + Eterm to; + ASSERT(!c_p || c_p->common.id == from); + ASSERT(lnk); + to = lnk->other.item; + if (is_not_immed(reason) || is_not_nil(token)) { + ASSERT(is_internal_pid(from) || is_internal_port(from)); + send_gen_exit_signal(c_p, from, from, to, ERTS_SIG_Q_OP_EXIT_LINKED, + reason, NIL, token, 0); + } + else { + /* Pass signal using old link structure... */ + ErtsSignal *sig = (ErtsSignal *) lnk; + lnk->other.item = reason; /* pass reason via this other.item */ + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_EXIT_LINKED, + lnk->type, 0); + if (proc_queue_signal(c_p, to, sig, ERTS_SIG_Q_OP_EXIT_LINKED)) + return; /* receiver will destroy lnk structure */ + } + if (lnk) + erts_link_release(lnk); +} + +int +erts_proc_sig_send_link(Process *c_p, Eterm to, ErtsLink *lnk) +{ + ErtsSignal *sig; + Uint16 type = lnk->type; + + ASSERT(!c_p || c_p->common.id == lnk->other.item); + ASSERT(lnk); + ASSERT(is_internal_pid(to)); + + sig = (ErtsSignal *) lnk; + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_LINK, + type, 0); + + return proc_queue_signal(c_p, to, sig, ERTS_SIG_Q_OP_LINK); +} + +void +erts_proc_sig_send_unlink(Process *c_p, ErtsLink *lnk) +{ + ErtsSignal *sig; + Eterm to; + + ASSERT(lnk); + + sig = (ErtsSignal *) lnk; + to = lnk->other.item; + + ASSERT(is_internal_pid(to)); + + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_UNLINK, + lnk->type, 0); + + if (!proc_queue_signal(c_p, to, sig, ERTS_SIG_Q_OP_UNLINK)) + erts_link_release(lnk); +} + +void +erts_proc_sig_send_dist_link_exit(DistEntry *dep, + Eterm from, Eterm to, + Eterm reason, Eterm token) +{ + send_gen_exit_signal(NULL, dep->sysname, from, to, ERTS_SIG_Q_OP_EXIT_LINKED, + reason, NIL, token, 0); +} + +void +erts_proc_sig_send_dist_unlink(DistEntry *dep, Eterm from, Eterm to) +{ + ErtsSignal *sig; + + ASSERT(is_internal_pid(to)); + ASSERT(is_external_pid(from)); + ASSERT(dep == external_pid_dist_entry(from)); + + sig = (ErtsSignal *) make_sig_dist_link_op(ERTS_SIG_Q_OP_UNLINK, + to, from); + + if (!proc_queue_signal(NULL, to, sig, ERTS_SIG_Q_OP_UNLINK)) + destroy_sig_dist_link_op((ErtsSigDistLinkOp *) sig); +} + +void +erts_proc_sig_send_dist_monitor_down(DistEntry *dep, Eterm ref, + Eterm from, Eterm to, + Eterm reason) +{ + Eterm monitored, heap[3]; + if (is_atom(from)) + monitored = TUPLE2(&heap[0], from, dep->sysname); + else + monitored = from; + send_gen_exit_signal(NULL, dep->sysname, monitored, + to, ERTS_SIG_Q_OP_MONITOR_DOWN, + reason, ref, NIL, 0); +} + +void +erts_proc_sig_send_monitor_down(ErtsMonitor *mon, Eterm reason) +{ + Eterm to; + + ASSERT(erts_monitor_is_target(mon)); + ASSERT(!erts_monitor_is_in_table(mon)); + + to = mon->other.item; + ASSERT(is_internal_pid(to)); + + if (is_immed(reason)) { + /* Pass signal using old monitor structure... */ + ErtsSignal *sig; + + mon->other.item = reason; /* Pass immed reason via other.item... */ + sig = (ErtsSignal *) mon; + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_MONITOR_DOWN, + mon->type, 0); + if (proc_queue_signal(NULL, to, sig, ERTS_SIG_Q_OP_MONITOR_DOWN)) + return; /* receiver will destroy mon structure */ + } + else { + ErtsMonitorData *mdp = erts_monitor_to_data(mon); + Eterm from_tag, monitored, heap[3]; + + if (!(mon->flags & ERTS_ML_FLG_NAME)) { + from_tag = monitored = mdp->origin.other.item; + if (is_external_pid(from_tag)) { + DistEntry *dep = external_pid_dist_entry(from_tag); + from_tag = dep->sysname; + } + } + else { + ErtsMonitorDataExtended *mdep; + Eterm name, node; + mdep = (ErtsMonitorDataExtended *) mdp; + name = mdep->u.name; + ASSERT(is_atom(name)); + if (mdep->dist) { + node = mdep->dist->nodename; + from_tag = node; + } + else { + node = erts_this_dist_entry->sysname; + from_tag = mdp->origin.other.item; + } + ASSERT(is_internal_port(from_tag) + || is_internal_pid(from_tag) + || is_atom(from_tag)); + monitored = TUPLE2(&heap[0], name, node); + } + send_gen_exit_signal(NULL, from_tag, monitored, + to, ERTS_SIG_Q_OP_MONITOR_DOWN, + reason, mdp->ref, NIL, 0); + } + erts_monitor_release(mon); +} + +void +erts_proc_sig_send_dist_demonitor(Eterm to, Eterm ref) +{ + ErtsSigDistProcDemonitor *dmon; + ErtsSignal *sig; + Eterm *hp; + ErlOffHeap oh; + size_t size; + + ERTS_INIT_OFF_HEAP(&oh); + + ASSERT(is_internal_pid(to)); + + size = sizeof(ErtsSigDistProcDemonitor) - sizeof(Eterm); + ASSERT(is_ref(ref)); + size += NC_HEAP_SIZE(ref)*sizeof(Eterm); + + dmon = erts_alloc(ERTS_ALC_T_DIST_DEMONITOR, size); + + hp = &dmon->heap[0]; + dmon->ref = STORE_NC(&hp, &oh, ref); + sig = (ErtsSignal *) dmon; + + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_DEMONITOR, + ERTS_SIG_Q_TYPE_DIST_PROC_DEMONITOR, + 0); + + if (!proc_queue_signal(NULL, to, sig, ERTS_SIG_Q_OP_DEMONITOR)) + destroy_dist_proc_demonitor(dmon); +} + +void +erts_proc_sig_send_demonitor(ErtsMonitor *mon) +{ + ErtsSignal *sig = (ErtsSignal *) mon; + Uint16 type = mon->type; + Eterm to = mon->other.item; + + ASSERT(is_internal_pid(to)); + ASSERT(erts_monitor_is_origin(mon)); + ASSERT(!erts_monitor_is_in_table(mon)); + + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_DEMONITOR, + type, 0); + + if (!proc_queue_signal(NULL, to, sig, ERTS_SIG_Q_OP_DEMONITOR)) + erts_monitor_release(mon); +} + +int +erts_proc_sig_send_monitor(ErtsMonitor *mon, Eterm to) +{ + ErtsSignal *sig = (ErtsSignal *) mon; + Uint16 type = mon->type; + + ASSERT(is_internal_pid(to) || to == am_undefined); + ASSERT(erts_monitor_is_target(mon)); + + sig->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_MONITOR, + type, 0); + + return proc_queue_signal(NULL, to, sig, ERTS_SIG_Q_OP_MONITOR); +} + +void +erts_proc_sig_send_trace_change(Eterm to, Uint on, Uint off, Eterm tracer) +{ + ErtsSigTraceInfo *ti; + Eterm tag; + + ti = erts_alloc(ERTS_ALC_T_SIG_DATA, sizeof(ErtsSigTraceInfo)); + tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_TRACE_CHANGE_STATE, + ERTS_SIG_Q_TYPE_ADJUST_TRACE_INFO, + 0); + + ti->common.tag = tag; + ti->flags_off = off; + ti->flags_on = on; + ti->tracer = NIL; + if (is_not_nil(tracer)) + erts_tracer_update(&ti->tracer, tracer); + + if (!proc_queue_signal(NULL, to, (ErtsSignal *) ti, + ERTS_SIG_Q_OP_TRACE_CHANGE_STATE)) + destroy_trace_info(ti); +} + +void +erts_proc_sig_send_group_leader(Process *c_p, Eterm to, Eterm gl, Eterm ref) +{ + int res; + ErtsSigGroupLeader *sgl; + Eterm *hp; + Uint gl_sz, ref_sz, size; + erts_aint_t init_flags = ERTS_SIG_GL_FLG_ACTIVE|ERTS_SIG_GL_FLG_RECEIVER; + if (c_p) + init_flags |= ERTS_SIG_GL_FLG_SENDER; + + ASSERT(c_p ? is_internal_ref(ref) : ref == NIL); + + gl_sz = is_immed(gl) ? 0 : size_object(gl); + ref_sz = is_immed(ref) ? 0 : size_object(ref); + + size = sizeof(ErtsSigGroupLeader); + + size += (gl_sz + ref_sz - 1) * sizeof(Eterm); + + sgl = erts_alloc(ERTS_ALC_T_SIG_DATA, size); + + erts_atomic_init_nob(&sgl->flags, init_flags); + + ERTS_INIT_OFF_HEAP(&sgl->oh); + + hp = &sgl->heap[0]; + + sgl->group_leader = is_immed(gl) ? gl : copy_struct(gl, gl_sz, &hp, &sgl->oh); + sgl->reply_to = c_p ? c_p->common.id : NIL; + sgl->ref = is_immed(ref) ? ref : copy_struct(ref, ref_sz, &hp, &sgl->oh); + + sgl->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_GROUP_LEADER, + ERTS_SIG_Q_TYPE_UNDEFINED, + 0); + + res = proc_queue_signal(c_p, to, (ErtsSignal *) sgl, + ERTS_SIG_Q_OP_GROUP_LEADER); + + if (!res) + destroy_sig_group_leader(sgl); + else if (c_p) { + erts_aint_t flags, rm_flags = ERTS_SIG_GL_FLG_SENDER; + int prio_res = maybe_elevate_sig_handling_prio(c_p, to); + if (!prio_res) + rm_flags |= ERTS_SIG_GL_FLG_ACTIVE; + flags = erts_atomic_read_band_nob(&sgl->flags, ~rm_flags); + if (!prio_res && (flags & ERTS_SIG_GL_FLG_ACTIVE)) + res = 0; /* We deactivated signal... */ + if ((flags & ~rm_flags) == 0) + destroy_sig_group_leader(sgl); + } + + if (!res && c_p) + group_leader_reply(c_p, c_p->common.id, ref, 0); +} + +void +erts_proc_sig_send_is_alive_request(Process *c_p, Eterm to, Eterm ref) +{ + ErlHeapFragment *hfrag; + Uint hsz; + Eterm *hp, *start_hp, ref_cpy, msg; + ErlOffHeap *ohp; + ErtsMessage *mp; + ErtsIsAliveRequest *alive_req; + + ASSERT(is_internal_ordinary_ref(ref)); + + hsz = ERTS_REF_THING_SIZE + 3 + sizeof(ErtsIsAliveRequest)/sizeof(Eterm); + + mp = erts_alloc_message(hsz, &hp); + hfrag = &mp->hfrag; + mp->next = NULL; + ohp = &hfrag->off_heap; + start_hp = hp; + + ref_cpy = STORE_NC(&hp, ohp, ref); + msg = TUPLE2(hp, ref_cpy, am_false); /* default res 'false' */ + hp += 3; + + hfrag->used_size = hp - start_hp; + + alive_req = (ErtsIsAliveRequest *) (char *) hp; + alive_req->message = msg; + alive_req->requester = c_p->common.id; + + ERL_MESSAGE_TERM(mp) = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_IS_ALIVE, + ERTS_SIG_Q_TYPE_UNDEFINED, + 0); + ERL_MESSAGE_TOKEN(mp) = NIL; + ERL_MESSAGE_FROM(mp) = am_system; +#ifdef USE_VM_PROBES + ERL_MESSAGE_DT_UTAG(mp) = NIL; +#endif + + if (proc_queue_signal(c_p, to, (ErtsSignal *) mp, ERTS_SIG_Q_OP_IS_ALIVE)) + (void) maybe_elevate_sig_handling_prio(c_p, to); + else { + /* It wasn't alive; reply to ourselves... */ + mp->next = NULL; + mp->data.attached = ERTS_MSG_COMBINED_HFRAG; + erts_queue_message(c_p, ERTS_PROC_LOCK_MAIN, mp, msg, am_system); + } +} + +int +erts_proc_sig_send_process_info_request(Process *c_p, + Eterm to, + int *item_ix, + int len, + int need_msgq_len, + int flags, + Uint reserve_size, + Eterm ref) +{ + Uint size = sizeof(ErtsProcessInfoSig) + (len - 1) * sizeof(int); + ErtsProcessInfoSig *pis = erts_alloc(ERTS_ALC_T_SIG_DATA, size); + int res; + + ASSERT(c_p); + ASSERT(item_ix); + ASSERT(len > 0); + ASSERT(is_internal_ordinary_ref(ref)); + + pis->common.tag = ERTS_PROC_SIG_MAKE_TAG(ERTS_SIG_Q_OP_PROCESS_INFO, + 0, 0); + + if (!need_msgq_len) + pis->msgq_len_offset = ERTS_PROC_SIG_PI_MSGQ_LEN_IGNORE; + else { + pis->msgq_len_offset = ERTS_PROC_SIG_PI_MSGQ_LEN_SYNC; + pis->marker.common.next = NULL; + pis->marker.common.specific.next = NULL; + pis->marker.common.tag = ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK; + pis->marker.refc = 0; + pis->marker.delayed_len = 0; + pis->marker.len_offset = 0; + } + pis->requester = c_p->common.id; + sys_memcpy((void *) &pis->oref_thing, + (void *) internal_ref_val(ref), + sizeof(ErtsORefThing)); + pis->ref = make_internal_ref((char *) &pis->oref_thing); + pis->reserve_size = reserve_size; + pis->len = len; + pis->flags = flags; + sys_memcpy((void *) &pis->item_ix[0], + (void *) item_ix, + sizeof(int)*len); + res = proc_queue_signal(c_p, to, (ErtsSignal *) pis, + ERTS_SIG_Q_OP_PROCESS_INFO); + if (res) + (void) maybe_elevate_sig_handling_prio(c_p, to); + else + erts_free(ERTS_ALC_T_SIG_DATA, pis); + return res; +} + +static void +is_alive_response(Process *c_p, ErtsMessage *mp, int is_alive) +{ + /* + * Sender prepared the message for us. Just patch + * the result if necessary. The default prepared + * result is 'false'. + */ + Process *rp; + ErtsIsAliveRequest *alive_req; + + alive_req = (ErtsIsAliveRequest *) (char *) (&mp->hfrag.mem[0] + + mp->hfrag.used_size); + + + ASSERT(ERTS_SIG_IS_NON_MSG(mp)); + ASSERT(ERTS_PROC_SIG_OP(((ErtsSignal *) mp)->common.tag) + == ERTS_SIG_Q_OP_IS_ALIVE); + ASSERT(mp->hfrag.alloc_size > mp->hfrag.used_size); + ASSERT((mp->hfrag.alloc_size - mp->hfrag.used_size)*sizeof(UWord) + >= sizeof(ErtsIsAliveRequest)); + ASSERT(is_internal_pid(alive_req->requester)); + ASSERT(alive_req->requester != c_p->common.id); + ASSERT(is_tuple_arity(alive_req->message, 2)); + ASSERT(is_internal_ordinary_ref(tuple_val(alive_req->message)[1])); + ASSERT(tuple_val(alive_req->message)[2] == am_false); + + ERL_MESSAGE_TERM(mp) = alive_req->message; + mp->data.attached = ERTS_MSG_COMBINED_HFRAG; + mp->next = NULL; + + rp = erts_proc_lookup(alive_req->requester); + if (!rp) + erts_cleanup_messages(mp); + else { + if (is_alive) { /* patch result... */ + Eterm *tp = tuple_val(alive_req->message); + tp[2] = am_true; + } + erts_queue_message(rp, 0, mp, alive_req->message, am_system); + } +} + +static ERTS_INLINE void +adjust_tracing_state(Process *c_p, ErtsSigRecvTracing *tracing, int setup) +{ + if (!IS_TRACED(c_p) || (ERTS_TRACE_FLAGS(c_p) & F_SENSITIVE)) { + tracing->messages.active = 0; + tracing->messages.receive_trace = 0; + tracing->messages.event = NULL; + tracing->messages.next = NULL; + tracing->procs = 0; + tracing->active = 0; + } + else { + Uint flgs = ERTS_TRACE_FLAGS(c_p); + int procs_trace = !!(flgs & F_TRACE_PROCS); + int recv_trace = !!(flgs & F_TRACE_RECEIVE); + /* procs tracing enabled? */ + + tracing->procs = procs_trace; + + /* message receive tracing enabled? */ + tracing->messages.receive_trace = recv_trace; + if (!recv_trace) + tracing->messages.event = NULL; + else { + if (tracing->messages.bp_ix < 0) + tracing->messages.bp_ix = erts_active_bp_ix(); + tracing->messages.event = &erts_receive_tracing[tracing->messages.bp_ix]; + } + if (setup) { + if (recv_trace) + tracing->messages.next = &c_p->sig_qs.cont; + else + tracing->messages.next = NULL; + } + tracing->messages.active = recv_trace; + tracing->active = recv_trace | procs_trace; + } + +#if defined(USE_VM_PROBES) + /* vm probe message_queued enabled? */ + + tracing->messages.vm_probes = DTRACE_ENABLED(message_queued); + if (tracing->messages.vm_probes) { + dtrace_proc_str(c_p, tracing->messages.receiver_name); + tracing->messages.active = !0; + tracing->active = !0; + if (setup && !tracing->messages.next) + tracing->messages.next = &c_p->sig_qs.cont; + } + +#endif +} + +static ERTS_INLINE void +setup_tracing_state(Process *c_p, ErtsSigRecvTracing *tracing) +{ + tracing->messages.bp_ix = -1; + adjust_tracing_state(c_p, tracing, !0); +} + +static ERTS_INLINE void +remove_iq_sig(Process *c_p, ErtsMessage *sig, ErtsMessage **next_sig) +{ + /* + * Remove signal from inner queue. + */ + ASSERT(c_p->sig_qs.cont_last != &sig->next); + ASSERT(c_p->sig_qs.nmsigs.next != &sig->next); + ASSERT(c_p->sig_qs.nmsigs.last != &sig->next); + + if (c_p->sig_qs.save == &sig->next) + c_p->sig_qs.save = next_sig; + if (c_p->sig_qs.last == &sig->next) + c_p->sig_qs.last = next_sig; + if (c_p->sig_qs.saved_last == &sig->next) + c_p->sig_qs.saved_last = next_sig; + + *next_sig = sig->next; +} + +static ERTS_INLINE void +remove_mq_sig(Process *c_p, ErtsMessage *sig, + ErtsMessage **next_sig, ErtsMessage ***next_nm_sig) +{ + /* + * Remove signal from middle queue. + */ + ASSERT(c_p->sig_qs.save != &sig->next); + ASSERT(c_p->sig_qs.last != &sig->next); + + if (c_p->sig_qs.cont_last == &sig->next) + c_p->sig_qs.cont_last = next_sig; + if (c_p->sig_qs.saved_last == &sig->next) + c_p->sig_qs.saved_last = next_sig; + if (*next_nm_sig == &sig->next) + *next_nm_sig = next_sig; + if (c_p->sig_qs.nmsigs.last == &sig->next) + c_p->sig_qs.nmsigs.last = next_sig; + + *next_sig = sig->next; +} + +static ERTS_INLINE void +remove_nm_sig(Process *c_p, ErtsMessage *sig, ErtsMessage ***next_nm_sig) +{ + ErtsMessage **next_sig = *next_nm_sig; + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + ASSERT(*next_sig == sig); + *next_nm_sig = ((ErtsSignal *) sig)->common.specific.next; + remove_mq_sig(c_p, sig, next_sig, next_nm_sig); +} + +static ERTS_INLINE void +convert_to_msg(Process *c_p, ErtsMessage *sig, ErtsMessage *msg, + ErtsMessage ***next_nm_sig) +{ + ErtsMessage **next_sig = *next_nm_sig; + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + *next_nm_sig = ((ErtsSignal *) sig)->common.specific.next; + c_p->sig_qs.len++; + *next_sig = msg; + remove_mq_sig(c_p, sig, &msg->next, next_nm_sig); +} + +static ERTS_INLINE void +convert_to_msgs(Process *c_p, ErtsMessage *sig, Uint no_msgs, + ErtsMessage *first_msg, ErtsMessage *last_msg, + ErtsMessage ***next_nm_sig) +{ + ErtsMessage **next_sig = *next_nm_sig; + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + *next_nm_sig = ((ErtsSignal *) sig)->common.specific.next; + c_p->sig_qs.len += no_msgs; + *next_sig = first_msg; + remove_mq_sig(c_p, sig, &last_msg->next, next_nm_sig); +} + +static ERTS_INLINE void +insert_messages(Process *c_p, ErtsMessage **next, ErtsMessage *first, + ErtsMessage *last, Uint no_msgs, ErtsMessage ***next_nm_sig) +{ + last->next = *next; + if (c_p->sig_qs.cont_last == next) + c_p->sig_qs.cont_last = &last->next; + if (*next_nm_sig == next) + *next_nm_sig = &last->next; + if (c_p->sig_qs.nmsigs.last == next) + c_p->sig_qs.nmsigs.last = &last->next; + c_p->sig_qs.len += no_msgs; + *next = first; +} + +static ERTS_INLINE void +remove_mq_m_sig(Process *c_p, ErtsMessage *sig, ErtsMessage **next_sig, ErtsMessage ***next_nm_sig) +{ + /* Removing message... */ + ASSERT(!ERTS_SIG_IS_NON_MSG(sig)); + c_p->sig_qs.len--; + remove_mq_sig(c_p, sig, next_sig, next_nm_sig); +} + +static ERTS_INLINE void +remove_iq_m_sig(Process *c_p, ErtsMessage *sig, ErtsMessage **next_sig) +{ + /* Removing message... */ + ASSERT(!ERTS_SIG_IS_NON_MSG(sig)); + c_p->sig_qs.len--; + remove_iq_sig(c_p, sig, next_sig); +} + +static ERTS_INLINE void +convert_prepared_sig_to_msg(Process *c_p, ErtsMessage *sig, Eterm msg, + ErtsMessage ***next_nm_sig) +{ + /* + * Everything is already there except for the reference to + * the message and the combined hfrag marker that needs to be + * restored... + */ + *next_nm_sig = ((ErtsSignal *) sig)->common.specific.next; + sig->data.attached = ERTS_MSG_COMBINED_HFRAG; + ERL_MESSAGE_TERM(sig) = msg; + c_p->sig_qs.len++; +} + +static ERTS_INLINE int +handle_exit_signal(Process *c_p, ErtsSigRecvTracing *tracing, + ErtsMessage *sig, ErtsMessage ***next_nm_sig, + int *exited) +{ + ErtsMessage *conv_msg = NULL; + ErtsExitSignalData *xsigd = NULL; + ErtsLinkData *ldp = NULL; /* Avoid erroneous warning... */ + ErtsLink *dlnk = NULL; /* Avoid erroneous warning... */ + Eterm tag = ((ErtsSignal *) sig)->common.tag; + Uint16 type = ERTS_PROC_SIG_TYPE(tag); + int op = ERTS_PROC_SIG_OP(tag); + int destroy = 0; + int ignore = 0; + int save = 0; + int exit = 0; + int cnt = 1; + Eterm reason; + Eterm from; + + if (type == ERTS_SIG_Q_TYPE_GEN_EXIT) { + xsigd = get_exit_signal_data(sig); + from = xsigd->from; + reason = xsigd->reason; + if (op != ERTS_SIG_Q_OP_EXIT_LINKED) + ignore = 0; + else { + ErtsLink *llnk = erts_link_tree_lookup(ERTS_P_LINKS(c_p), from); + if (!llnk) { + /* Link no longer active; ignore... */ + ignore = !0; + destroy = !0; + } + else { + ignore = 0; + erts_link_tree_delete(&ERTS_P_LINKS(c_p), llnk); + if (llnk->type != ERTS_LNK_TYPE_DIST_PROC) + erts_link_release(llnk); + else { + dlnk = erts_link_to_other(llnk, &ldp); + if (erts_link_dist_delete(dlnk)) + erts_link_release_both(ldp); + else + erts_link_release(llnk); + } + } + } + + if (!ignore) { + + if ((op != ERTS_SIG_Q_OP_EXIT || reason != am_kill) + && (c_p->flags & F_TRAP_EXIT)) { + convert_prepared_sig_to_msg(c_p, sig, + xsigd->message, next_nm_sig); + conv_msg = sig; + } + else if (reason == am_normal && !xsigd->u.normal_kills) { + /* Ignore it... */ + destroy = !0; + ignore = !0; + } + else { + /* Terminate... */ + save = !0; + exit = !0; + if (op == ERTS_SIG_Q_OP_EXIT && reason == am_kill) + reason = am_killed; + } + } + } + else { /* Link exit */ + ErtsLink *slnk = (ErtsLink *) sig; + ErtsLink *llnk = erts_link_to_other(slnk, &ldp); + + ASSERT(type == ERTS_LNK_TYPE_PROC + || type == ERTS_LNK_TYPE_PORT + || type == ERTS_LNK_TYPE_DIST_PROC); + + from = llnk->other.item; + reason = slnk->other.item; /* reason in other.item ... */ + ASSERT(is_pid(from) || is_internal_port(from)); + ASSERT(is_immed(reason)); + ASSERT(op == ERTS_SIG_Q_OP_EXIT_LINKED); + dlnk = erts_link_tree_key_delete(&ERTS_P_LINKS(c_p), llnk); + if (!dlnk) { + ignore = !0; /* Link no longer active; ignore... */ + ldp = NULL; + } + else { + Eterm pid; + ErtsMessage *mp; + ErtsProcLocks locks; + Uint hsz; + Eterm *hp; + ErlOffHeap *ohp; + ignore = 0; + if (dlnk == llnk) + dlnk = NULL; + else + ldp = NULL; + + ASSERT(is_immed(reason)); + + if (!(c_p->flags & F_TRAP_EXIT)) { + if (reason == am_normal) + ignore = !0; /* Ignore it... */ + else + exit = !0; /* Terminate... */ + } + else { + + /* + * Create and EXIT message and replace + * the original signal with the message... + */ + + locks = ERTS_PROC_LOCK_MAIN; + + hsz = 4 + NC_HEAP_SIZE(from); + + mp = erts_alloc_message_heap(c_p, &locks, hsz, &hp, &ohp); + + if (locks != ERTS_PROC_LOCK_MAIN) + erts_proc_unlock(c_p, locks & ~ERTS_PROC_LOCK_MAIN); + + pid = STORE_NC(&hp, ohp, from); + + ERL_MESSAGE_TERM(mp) = TUPLE3(hp, am_EXIT, pid, reason); + ERL_MESSAGE_TOKEN(mp) = NIL; +#ifdef USE_VM_PROBES + ERL_MESSAGE_DT_UTAG(mp) = NIL; +#endif + if (is_immed(pid)) + ERL_MESSAGE_FROM(mp) = pid; + else { + DistEntry *dep; + ASSERT(is_external_pid(pid)); + dep = external_pid_dist_entry(pid); + ERL_MESSAGE_FROM(mp) = dep->sysname; + } + + /* Replace original signal with the exit message... */ + convert_to_msg(c_p, sig, mp, next_nm_sig); + + cnt += 4; + + conv_msg = mp; + } + } + destroy = !0; + } + + if (ignore|exit) { + remove_nm_sig(c_p, sig, next_nm_sig); + if (exit) { + if (save) { + sig->data.attached = ERTS_MSG_COMBINED_HFRAG; + ERL_MESSAGE_TERM(sig) = xsigd->message; + erts_save_message_in_proc(c_p, sig); + } + /* Exit process... */ + erts_set_self_exiting(c_p, reason); + + cnt++; + } + } + + if (!exit) { + if (conv_msg) + erts_proc_notify_new_message(c_p, ERTS_PROC_LOCK_MAIN); + if (op == ERTS_SIG_Q_OP_EXIT_LINKED && tracing->procs) + getting_unlinked(c_p, from); + } + + if (destroy) { + cnt++; + if (type == ERTS_SIG_Q_TYPE_GEN_EXIT) { + sig->next = NULL; + erts_cleanup_messages(sig); + } + else { + if (ldp) + erts_link_release_both(ldp); + else { + if (dlnk) + erts_link_release(dlnk); + erts_link_release((ErtsLink *) sig); + } + } + } + + *exited = exit; + + return cnt; +} + +static ERTS_INLINE int +convert_prepared_down_message(Process *c_p, ErtsMessage *sig, + Eterm msg, ErtsMessage ***next_nm_sig) +{ + convert_prepared_sig_to_msg(c_p, sig, msg, next_nm_sig); + erts_proc_notify_new_message(c_p, ERTS_PROC_LOCK_MAIN); + return 1; +} + +static int +convert_to_down_message(Process *c_p, + ErtsMessage *sig, + ErtsMonitorData *mdp, + Uint16 mon_type, + ErtsMessage ***next_nm_sig) +{ + /* + * Create a 'DOWN' message and replace the signal + * with it... + */ + int cnt = 0; + Eterm node = am_undefined; + ErtsMessage *mp; + ErtsProcLocks locks; + Uint hsz; + Eterm *hp, ref, from, type, reason; + ErlOffHeap *ohp; + + ASSERT(mdp); + ASSERT((mdp->origin.flags & ERTS_ML_FLGS_SAME) + == (mdp->target.flags & ERTS_ML_FLGS_SAME)); + + hsz = 6; /* 5-tuple */ + + if (mdp->origin.flags & ERTS_ML_FLG_NAME) + hsz += 3; /* reg name 2-tuple */ + else { + ASSERT(is_pid(mdp->origin.other.item) + || is_internal_port(mdp->origin.other.item)); + hsz += NC_HEAP_SIZE(mdp->origin.other.item); + } + + ASSERT(is_ref(mdp->ref)); + hsz += NC_HEAP_SIZE(mdp->ref); + + locks = ERTS_PROC_LOCK_MAIN; + + /* reason is mdp->target.other.item */ + reason = mdp->target.other.item; + ASSERT(is_immed(reason)); + + mp = erts_alloc_message_heap(c_p, &locks, hsz, &hp, &ohp); + + if (locks != ERTS_PROC_LOCK_MAIN) + erts_proc_unlock(c_p, locks & ~ERTS_PROC_LOCK_MAIN); + + cnt += 4; + + ref = STORE_NC(&hp, ohp, mdp->ref); + + if (!(mdp->origin.flags & ERTS_ML_FLG_NAME)) { + from = STORE_NC(&hp, ohp, mdp->origin.other.item); + } + else { + ErtsMonitorDataExtended *mdep; + ASSERT(mdp->origin.flags & ERTS_ML_FLG_EXTENDED); + mdep = (ErtsMonitorDataExtended *) mdp; + ASSERT(is_atom(mdep->u.name)); + if (mdep->dist) + node = mdep->dist->nodename; + else + node = erts_this_dist_entry->sysname; + from = TUPLE2(hp, mdep->u.name, node); + hp += 3; + } + + ASSERT(mdp->origin.type == mon_type); + switch (mon_type) { + case ERTS_MON_TYPE_PORT: + type = am_port; + if (mdp->origin.other.item == am_undefined) { + /* failed by name... */ + ERL_MESSAGE_FROM(mp) = am_system; + } + else { + ASSERT(is_internal_port(mdp->origin.other.item)); + ERL_MESSAGE_FROM(mp) = mdp->origin.other.item; + } + break; + case ERTS_MON_TYPE_PROC: + type = am_process; + if (mdp->origin.other.item == am_undefined) { + /* failed by name... */ + ERL_MESSAGE_FROM(mp) = am_system; + } + else { + ASSERT(is_internal_pid(mdp->origin.other.item)); + ERL_MESSAGE_FROM(mp) = mdp->origin.other.item; + } + break; + case ERTS_MON_TYPE_DIST_PROC: + type = am_process; + if (node == am_undefined) { + ErtsMonitorDataExtended *mdep; + ASSERT(mdp->origin.flags & ERTS_ML_FLG_EXTENDED); + mdep = (ErtsMonitorDataExtended *) mdp; + ASSERT(mdep->dist); + node = mdep->dist->nodename; + } + ASSERT(is_atom(node) && node != am_undefined); + ERL_MESSAGE_FROM(mp) = node; + break; + default: + ERTS_INTERNAL_ERROR("Unexpected monitor type"); + type = am_undefined; + ERL_MESSAGE_FROM(mp) = am_undefined; + break; + } + + ERL_MESSAGE_TERM(mp) = TUPLE5(hp, am_DOWN, ref, + type, from, reason); + hp += 6; + + ERL_MESSAGE_TOKEN(mp) = NIL; +#ifdef USE_VM_PROBES + ERL_MESSAGE_DT_UTAG(mp) = NIL; +#endif + /* Replace original signal with the exit message... */ + convert_to_msg(c_p, sig, mp, next_nm_sig); + + cnt += 4; + + erts_proc_notify_new_message(c_p, ERTS_PROC_LOCK_MAIN); + + return cnt; +} + +static ERTS_INLINE int +convert_to_nodedown_messages(Process *c_p, + ErtsMessage *sig, + ErtsMonitorData *mdp, + ErtsMessage ***next_nm_sig) +{ + int cnt = 1; + Uint n; + ErtsMonitorDataExtended *mdep = (ErtsMonitorDataExtended *) mdp; + + ASSERT((mdp->origin.flags & ERTS_ML_FLGS_SAME) + == (mdp->target.flags & ERTS_ML_FLGS_SAME)); + ASSERT(mdp->origin.flags & ERTS_ML_FLG_EXTENDED); + + n = mdep->u.refc; + + if (n == 0) + remove_nm_sig(c_p, sig, next_nm_sig); + else { + Uint i; + ErtsMessage *nd_first = NULL; + ErtsMessage *nd_last = NULL; + ErtsProcLocks locks = ERTS_PROC_LOCK_MAIN; + Eterm node = mdep->dist->nodename; + + ASSERT(is_atom(node)); + ASSERT(n > 0); + + for (i = 0; i < n; i++) { + ErtsMessage *mp; + ErlOffHeap *ohp; + Eterm *hp; + + mp = erts_alloc_message_heap(c_p, &locks, 3, &hp, &ohp); + + ERL_MESSAGE_TERM(mp) = TUPLE2(hp, am_nodedown, node); + ERL_MESSAGE_FROM(mp) = am_system; + ERL_MESSAGE_TOKEN(mp) = NIL; +#ifdef USE_VM_PROBES + ERL_MESSAGE_DT_UTAG(mp) = NIL; +#endif + mp->next = nd_first; + nd_first = mp; + if (!nd_last) + nd_last = mp; + cnt++; + } + + if (locks != ERTS_PROC_LOCK_MAIN) + erts_proc_unlock(c_p, locks & ~ERTS_PROC_LOCK_MAIN); + + /* Replace signal with 'nodedown' messages */ + convert_to_msgs(c_p, sig, n, nd_first, nd_last, next_nm_sig); + + erts_proc_notify_new_message(c_p, ERTS_PROC_LOCK_MAIN); + } + return cnt; +} + +static int +handle_nodedown(Process *c_p, + ErtsMessage *sig, + ErtsMonitorData *mdp, + ErtsMessage ***next_nm_sig) +{ + ErtsMonitorDataExtended *mdep = (ErtsMonitorDataExtended *) mdp; + ErtsMonitor *omon = &mdp->origin; + int not_in_subtab = !(omon->flags & ERTS_ML_FLG_IN_SUBTABLE); + int cnt = 1; + + ASSERT(erts_monitor_is_in_table(omon)); + + if (not_in_subtab & !mdep->uptr.node_monitors) + erts_monitor_tree_delete(&ERTS_P_MONITORS(c_p), omon); + else if (not_in_subtab) { + ErtsMonitor *sub_mon; + ErtsMonitorDataExtended *sub_mdep; + sub_mon = erts_monitor_list_last(mdep->uptr.node_monitors); + ASSERT(sub_mon); + erts_monitor_list_delete(&mdep->uptr.node_monitors, sub_mon); + sub_mon->flags &= ~ERTS_ML_FLG_IN_SUBTABLE; + sub_mdep = (ErtsMonitorDataExtended *) erts_monitor_to_data(sub_mon); + ASSERT(!sub_mdep->uptr.node_monitors); + sub_mdep->uptr.node_monitors = mdep->uptr.node_monitors; + mdep->uptr.node_monitors = NULL; + erts_monitor_tree_replace(&ERTS_P_MONITORS(c_p), omon, sub_mon); + cnt += 2; + } + else { + ErtsMonitorDataExtended *top_mdep; + ErtsMonitor *top_mon; + ASSERT(is_atom(omon->other.item)); + ASSERT(!mdep->uptr.node_monitors); + top_mon = erts_monitor_tree_lookup(ERTS_P_MONITORS(c_p), + omon->other.item); + ASSERT(top_mon); + top_mdep = (ErtsMonitorDataExtended *) erts_monitor_to_data(top_mon); + ASSERT(top_mdep->uptr.node_monitors); + erts_monitor_list_delete(&top_mdep->uptr.node_monitors, omon); + omon->flags &= ~ERTS_ML_FLG_IN_SUBTABLE; + cnt += 3; + } + + return cnt + convert_to_nodedown_messages(c_p, sig, mdp, next_nm_sig); +} + +static void +handle_persistent_mon_msg(Process *c_p, Uint16 type, + ErtsMonitor *mon, ErtsMessage *sig, + Eterm msg, ErtsMessage ***next_nm_sig) +{ + convert_prepared_sig_to_msg(c_p, sig, msg, next_nm_sig); + + switch (type) { + + case ERTS_MON_TYPE_TIME_OFFSET: + ASSERT(mon->type == ERTS_MON_TYPE_TIME_OFFSET); + break; + + case ERTS_MON_TYPE_NODES: { + ErtsMonitorDataExtended *mdep; + Uint n; + ASSERT(mon->type == ERTS_MON_TYPE_NODES); + mdep = (ErtsMonitorDataExtended *) erts_monitor_to_data(mon); + ERTS_ML_ASSERT(mdep->u.refc > 0); + n = mdep->u.refc; + n--; + if (n > 0) { + ErtsProcLocks locks = ERTS_PROC_LOCK_MAIN; + ErtsMessage *first = NULL, *prev, *last; + Uint hsz = size_object(msg); + Uint i; + + for (i = 0; i < n; i++) { + Eterm *hp; + ErlOffHeap *ohp; + + last = erts_alloc_message_heap(c_p, &locks, hsz, &hp, &ohp); + + if (!first) + first = last; + else + prev->next = last; + prev = last; + + ERL_MESSAGE_TERM(last) = copy_struct(msg, hsz, &hp, ohp); + +#ifdef USE_VM_PROBES + ASSERT(is_immed(ERL_MESSAGE_DT_UTAG(sig))); + ERL_MESSAGE_DT_UTAG(last) = ERL_MESSAGE_DT_UTAG(sig); +#endif + ASSERT(is_immed(ERL_MESSAGE_TOKEN(sig))); + ERL_MESSAGE_TOKEN(last) = ERL_MESSAGE_TOKEN(sig); + ASSERT(is_immed(ERL_MESSAGE_FROM(sig))); + ERL_MESSAGE_FROM(last) = ERL_MESSAGE_FROM(sig); + + } + if (locks != ERTS_PROC_LOCK_MAIN) + erts_proc_unlock(c_p, locks & ~ERTS_PROC_LOCK_MAIN); + insert_messages(c_p, &sig->next, first, last, n, next_nm_sig); + } + break; + } + + default: + ERTS_INTERNAL_ERROR("Invalid type"); + break; + } + + erts_proc_notify_new_message(c_p, ERTS_PROC_LOCK_MAIN); +} + +static void +group_leader_reply(Process *c_p, Eterm to, Eterm ref, int success) +{ + Process *rp = erts_proc_lookup(to); + + if (rp) { + ErtsProcLocks locks; + Uint sz; + Eterm *hp, msg, ref_cpy, result; + ErlOffHeap *ohp; + ErtsMessage *mp; + + ASSERT(is_internal_ref(ref)); + + locks = c_p == rp ? ERTS_PROC_LOCK_MAIN : 0; + sz = size_object(ref); + + mp = erts_alloc_message_heap(rp, &locks, sz+3, + &hp, &ohp); + + ref_cpy = copy_struct(ref, sz, &hp, ohp); + result = success ? am_true : am_badarg; + msg = TUPLE2(hp, ref_cpy, result); + + erts_queue_message(rp, locks, mp, msg, am_system); + + if (c_p == rp) + locks &= ~ERTS_PROC_LOCK_MAIN; + + if (locks) + erts_proc_unlock(rp, locks); + } +} + +static void +handle_group_leader(Process *c_p, ErtsSigGroupLeader *sgl) +{ + erts_aint_t flags; + + flags = erts_atomic_read_band_nob(&sgl->flags, ~ERTS_SIG_GL_FLG_ACTIVE); + if (flags & ERTS_SIG_GL_FLG_ACTIVE) { + int res = erts_set_group_leader(c_p, sgl->group_leader); + if (is_internal_pid(sgl->reply_to)) + group_leader_reply(c_p, sgl->reply_to, sgl->ref, res); + } + + flags = erts_atomic_read_band_nob(&sgl->flags, ~ERTS_SIG_GL_FLG_RECEIVER); + if ((flags & ~ERTS_SIG_GL_FLG_RECEIVER) == 0) + destroy_sig_group_leader(sgl); +} + +static void +check_push_msgq_len_offs_marker(Process *rp, ErtsSignal *sig) +{ + ErtsProcessInfoSig *pisig = (ErtsProcessInfoSig *) sig; + + ASSERT(ERTS_PROC_SIG_OP(sig->common.tag) == ERTS_SIG_Q_OP_PROCESS_INFO); + + if (pisig->msgq_len_offset == ERTS_PROC_SIG_PI_MSGQ_LEN_SYNC) { + ErtsProcSigMsgQLenOffsetMarker *mrkr; + Sint len, msgq_len_offset; + ErtsMessage *first = rp->sig_inq.first; + ASSERT(first); + if (((ErtsSignal *) first)->common.tag == ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK) + mrkr = (ErtsProcSigMsgQLenOffsetMarker *) first; + else { + mrkr = &pisig->marker; + + ASSERT(mrkr->common.tag == ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK); + + mrkr->common.next = first; + ASSERT(rp->sig_inq.last != &rp->sig_inq.first); + if (rp->sig_inq.nmsigs.next == &rp->sig_inq.first) + rp->sig_inq.nmsigs.next = &mrkr->common.next; + if (rp->sig_inq.nmsigs.last == &rp->sig_inq.first) + rp->sig_inq.nmsigs.last = &mrkr->common.next; + rp->sig_inq.first = (ErtsMessage *) mrkr; + } + + len = rp->sig_inq.len; + msgq_len_offset = len - mrkr->len_offset; + + mrkr->len_offset = len; + mrkr->refc++; + + pisig->msgq_len_offset = msgq_len_offset; + +#ifdef DEBUG + /* save pointer to used marker... */ + pisig->marker.common.specific.attachment = (void *) mrkr; +#endif + + } +} + +static void +destroy_process_info_request(Process *c_p, ErtsProcessInfoSig *pisig) +{ + int dealloc_pisig = !0; + + if (pisig->msgq_len_offset != ERTS_PROC_SIG_PI_MSGQ_LEN_IGNORE) { + Sint refc; + int dealloc_marker = 0; + ErtsProcSigMsgQLenOffsetMarker *marker; +#ifdef ERTS_PROC_SIG_HARD_DEBUG_SIGQ_MSG_LEN + Sint delayed_len; +#endif + + ASSERT(pisig->msgq_len_offset >= 0); + + erts_proc_lock(c_p, ERTS_PROC_LOCK_MSGQ); + marker = (ErtsProcSigMsgQLenOffsetMarker *) c_p->sig_inq.first; + ASSERT(marker); + ASSERT(marker->refc > 0); + ASSERT(pisig->marker.common.specific.attachment == (void *) marker); + + marker->delayed_len -= pisig->msgq_len_offset; +#ifdef ERTS_PROC_SIG_HARD_DEBUG_SIGQ_MSG_LEN + delayed_len = marker->delayed_len; +#endif + + refc = --marker->refc; + if (refc) { + if (marker == &pisig->marker) { + /* Another signal using our marker... */ + dealloc_pisig = 0; + } + } + else { + /* Marker unused; remove it... */ + ASSERT(marker->delayed_len + marker->len_offset == 0); +#ifdef ERTS_PROC_SIG_HARD_DEBUG_SIGQ_MSG_LEN + delayed_len += marker->len_offset; +#endif + if (marker != &pisig->marker) + dealloc_marker = !0; /* used another signals marker... */ + c_p->sig_inq.first = marker->common.next; + if (c_p->sig_inq.last == &marker->common.next) + c_p->sig_inq.last = &c_p->sig_inq.first; + if (c_p->sig_inq.nmsigs.next == &marker->common.next) + c_p->sig_inq.nmsigs.next = &c_p->sig_inq.first; + if (c_p->sig_inq.nmsigs.last == &marker->common.next) + c_p->sig_inq.nmsigs.last = &c_p->sig_inq.first; + } + erts_proc_unlock(c_p, ERTS_PROC_LOCK_MSGQ); + + if (!refc) { + c_p->flags &= ~F_DELAYED_PSIGQS_LEN; + /* Adjust msg len of inner+middle queue */ + ASSERT(marker->len_offset <= 0); + c_p->sig_qs.len -= marker->len_offset; + + ASSERT(c_p->sig_qs.len >= 0); + } + +#ifdef ERTS_PROC_SIG_HARD_DEBUG_SIGQ_MSG_LEN + { + Sint len = 0; + ERTS_FOREACH_SIG_PRIVQS( + c_p, mp, + { + if (ERTS_SIG_IS_MSG(mp)) + len++; + }); + ERTS_ASSERT(c_p->sig_qs.len + delayed_len == len); + } +#endif + + + if (dealloc_marker) { + ErtsProcessInfoSig *pisig2 + = (ErtsProcessInfoSig *) (((char *) marker) + - offsetof(ErtsProcessInfoSig, + marker)); + erts_free(ERTS_ALC_T_SIG_DATA, pisig2); + } + } + + if (dealloc_pisig) + erts_free(ERTS_ALC_T_SIG_DATA, pisig); +} + +static int +handle_process_info(Process *c_p, ErtsSigRecvTracing *tracing, + ErtsMessage *sig, ErtsMessage ***next_nm_sig, + int is_alive) +{ + ErtsProcessInfoSig *pisig = (ErtsProcessInfoSig *) sig; + Uint reds = 0; + Process *rp; + + if (pisig->msgq_len_offset != ERTS_PROC_SIG_PI_MSGQ_LEN_IGNORE) { + /* + * Request requires message queue data to be updated + * before inspection... + */ + + ASSERT(pisig->msgq_len_offset >= 0); + /* + * Update sig_qs.len to reflect the length + * of the message queue... + */ + c_p->sig_qs.len += pisig->msgq_len_offset; + + if (is_alive) { + /* + * Move messages part of message queue into inner + * signal queue... + */ + ASSERT(tracing); + + if (*next_nm_sig != &c_p->sig_qs.cont) { + if (*next_nm_sig == tracing->messages.next) + tracing->messages.next = &c_p->sig_qs.cont; + *c_p->sig_qs.last = c_p->sig_qs.cont; + c_p->sig_qs.last = *next_nm_sig; + + c_p->sig_qs.cont = **next_nm_sig; + if (c_p->sig_qs.nmsigs.last == *next_nm_sig) + c_p->sig_qs.nmsigs.last = &c_p->sig_qs.cont; + *next_nm_sig = &c_p->sig_qs.cont; + *c_p->sig_qs.last = NULL; + } + +#ifdef ERTS_PROC_SIG_HARD_DEBUG_SIGQ_MSG_LEN + { + Sint len; + ErtsMessage *mp; + for (mp = c_p->sig_qs.first, len = 0; mp; mp = mp->next) { + ERTS_ASSERT(ERTS_SIG_IS_MSG(mp)); + len++; + } + ERTS_ASSERT(c_p->sig_qs.len == len); + } +#endif + } + } + if (is_alive) { + if (!pisig->common.specific.next) { + /* + * No more signals in middle queue... + * + * Process-info 'status' needs sig-q + * process flag to be updated in order + * to show accurate result... + */ + erts_atomic32_read_band_nob(&c_p->state, + ~ERTS_PSFLG_SIG_Q); + } + remove_nm_sig(c_p, sig, next_nm_sig); + } + + rp = erts_proc_lookup(pisig->requester); + ASSERT(c_p != rp); + if (rp) { + Eterm msg, res, ref, *hp; + ErtsProcLocks locks = 0; + ErtsHeapFactory hfact; + ErtsMessage *mp; + Uint reserve_size = 3 + sizeof(pisig->oref_thing)/sizeof(Eterm); + + if (!is_alive) { + ErlOffHeap *ohp; + mp = erts_alloc_message_heap(rp, &locks, reserve_size, &hp, &ohp); + res = am_undefined; + } + else { + ErlHeapFragment *hfrag; + + reserve_size += pisig->reserve_size; + + mp = erts_alloc_message(0, NULL); + hfrag = new_message_buffer(reserve_size); + mp->data.heap_frag = hfrag; + erts_factory_selfcontained_message_init(&hfact, mp, &hfrag->mem[0]); + + res = erts_process_info(c_p, &hfact, c_p, ERTS_PROC_LOCK_MAIN, + pisig->item_ix, pisig->len, + pisig->flags, reserve_size, &reds); + + hp = erts_produce_heap(&hfact, + 3 + sizeof(pisig->oref_thing)/sizeof(Eterm), + 0); + } + + sys_memcpy((void *) hp, (void *) &pisig->oref_thing, + sizeof(pisig->oref_thing)); + ref = make_internal_ref(hp); + hp += sizeof(pisig->oref_thing)/sizeof(Eterm); + + msg = TUPLE2(hp, ref, res); + + if (is_alive) + erts_factory_trim_and_close(&hfact, &msg, 1); + + erts_queue_proc_message(c_p, rp, locks, mp, msg); + + if (!is_alive && locks) + erts_proc_unlock(rp, locks); + } + + destroy_process_info_request(c_p, pisig); + + if (reds > INT_MAX/8) + reds = INT_MAX/8; + + return ((int) reds)*4 + 8; +} + +/* + * Called in order to handle incoming signals. + */ + +int +erts_proc_sig_handle_incoming(Process *c_p, erts_aint32_t *statep, + int *redsp, int max_reds, int local_only) +{ + Eterm tag; + erts_aint32_t state; + int cnt, limit, abs_lim, msg_tracing; + ErtsMessage *sig, ***next_nm_sig; + ErtsSigRecvTracing tracing; + + ERTS_HDBG_CHECK_SIGNAL_PRIV_QUEUE(c_p, 0); + ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(c_p)); + + if (local_only) + state = -1; /* can never be a valid state... */ + else { + state = erts_atomic32_read_nob(&c_p->state); + if (ERTS_PSFLG_SIG_IN_Q & state) { + erts_proc_lock(c_p, ERTS_PROC_LOCK_MSGQ); + erts_proc_sig_fetch(c_p); + erts_proc_unlock(c_p, ERTS_PROC_LOCK_MSGQ); + } + } + + limit = *redsp; + *redsp = 0; + + if (!c_p->sig_qs.cont) { + if (state == -1) + *statep = erts_atomic32_read_nob(&c_p->state); + else + *statep = state; + return !0; + } + + next_nm_sig = &c_p->sig_qs.nmsigs.next; + + setup_tracing_state(c_p, &tracing); + msg_tracing = tracing.messages.active; + + limit *= ERTS_SIG_REDS_CNT_FACTOR; + abs_lim = ERTS_SIG_REDS_CNT_FACTOR*max_reds; + if (limit > abs_lim) + limit = abs_lim; + + cnt = 0; + + do { + + if (msg_tracing) { + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + if (handle_msg_tracing(c_p, &tracing, next_nm_sig) != 0) { + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; /* tracing limit or end... */ + } + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + } + + if (!*next_nm_sig) + break; + + sig = **next_nm_sig; + + ASSERT(sig); + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + + tag = ((ErtsSignal *) sig)->common.tag; + + switch (ERTS_PROC_SIG_OP(tag)) { + + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: { + int exited; + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + cnt += handle_exit_signal(c_p, &tracing, sig, + next_nm_sig, &exited); + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + if (exited) + goto stop; /* terminated by signal */ + /* ignored or converted to exit message... */ + break; + } + + case ERTS_SIG_Q_OP_MONITOR_DOWN: { + Uint16 type = ERTS_PROC_SIG_TYPE(tag); + ErtsExitSignalData *xsigd = NULL; + ErtsMonitorData *mdp = NULL; + ErtsMonitor *omon = NULL, *tmon = NULL; + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + switch (type) { + case ERTS_MON_TYPE_DIST_PROC: + case ERTS_MON_TYPE_PROC: + case ERTS_MON_TYPE_PORT: + tmon = (ErtsMonitor *) sig; + ASSERT(erts_monitor_is_target(tmon)); + ASSERT(!erts_monitor_is_in_table(tmon)); + mdp = erts_monitor_to_data(tmon); + if (erts_monitor_is_in_table(&mdp->origin)) { + omon = &mdp->origin; + erts_monitor_tree_delete(&ERTS_P_MONITORS(c_p), + omon); + cnt += convert_to_down_message(c_p, sig, mdp, + type, next_nm_sig); + } + break; + case ERTS_SIG_Q_TYPE_GEN_EXIT: + xsigd = get_exit_signal_data(sig); + omon = erts_monitor_tree_lookup(ERTS_P_MONITORS(c_p), + xsigd->u.ref); + if (omon) { + ASSERT(erts_monitor_is_origin(omon)); + if (omon->type == ERTS_MON_TYPE_DIST_PROC) { + mdp = erts_monitor_to_data(omon); + if (erts_monitor_dist_delete(&mdp->target)) + tmon = &mdp->target; + } + erts_monitor_tree_delete(&ERTS_P_MONITORS(c_p), + omon); + cnt += convert_prepared_down_message(c_p, sig, + xsigd->message, + next_nm_sig); + } + break; + case ERTS_MON_TYPE_NODE: + tmon = (ErtsMonitor *) sig; + ASSERT(erts_monitor_is_target(tmon)); + ASSERT(!erts_monitor_is_in_table(tmon)); + mdp = erts_monitor_to_data(tmon); + if (erts_monitor_is_in_table(&mdp->origin)) { + omon = &mdp->origin; + cnt += handle_nodedown(c_p, sig, mdp, next_nm_sig); + } + break; + default: + ERTS_INTERNAL_ERROR("invalid monitor type"); + break; + } + + if (omon) { + if (tmon) + erts_monitor_release_both(mdp); + else + erts_monitor_release(omon); + } + else { + remove_nm_sig(c_p, sig, next_nm_sig); + if (xsigd) { + sig->next = NULL; + erts_cleanup_messages(sig); + } + if (tmon) + erts_monitor_release(tmon); + } + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_PERSISTENT_MON_MSG: { + Uint16 type = ERTS_PROC_SIG_TYPE(tag); + ErtsMonitor *mon; + Eterm msg; + Eterm key; + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + key = get_persist_mon_msg(sig, &msg); + + cnt++; + mon = erts_monitor_tree_lookup(ERTS_P_MONITORS(c_p), key); + if (mon) { + ASSERT(erts_monitor_is_origin(mon)); + handle_persistent_mon_msg(c_p, type, mon, sig, + msg, next_nm_sig); + } + else { + cnt++; + remove_nm_sig(c_p, sig, next_nm_sig); + sig->next = NULL; + erts_cleanup_messages(sig); + } + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_MONITOR: { + ErtsMonitor *mon = (ErtsMonitor *) sig; + + ASSERT(erts_monitor_is_target(mon)); + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + remove_nm_sig(c_p, sig, next_nm_sig); + + if (mon->type == ERTS_MON_TYPE_DIST_PROC) + erts_monitor_tree_insert(&ERTS_P_MONITORS(c_p), mon); + else + erts_monitor_list_insert(&ERTS_P_LT_MONITORS(c_p), mon); + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_DEMONITOR: { + Uint16 type = ERTS_PROC_SIG_TYPE(tag); + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + remove_nm_sig(c_p, sig, next_nm_sig); + + if (type == ERTS_SIG_Q_TYPE_DIST_PROC_DEMONITOR) { + ErtsMonitor *tmon; + ErtsSigDistProcDemonitor *dmon; + dmon = (ErtsSigDistProcDemonitor *) sig; + tmon = erts_monitor_tree_lookup(ERTS_P_MONITORS(c_p), dmon->ref); + destroy_dist_proc_demonitor(dmon); + cnt++; + if (tmon) { + ErtsMonitorData *mdp = erts_monitor_to_data(tmon); + ASSERT(erts_monitor_is_target(tmon)); + erts_monitor_tree_delete(&ERTS_P_MONITORS(c_p), tmon); + if (!erts_monitor_dist_delete(&mdp->origin)) + erts_monitor_release(tmon); + else + erts_monitor_release_both(mdp); + cnt += 2; + } + } + else { + ErtsMonitor *omon = (ErtsMonitor *) sig; + ErtsMonitorData *mdp = erts_monitor_to_data(omon); + ASSERT(omon->type == type); + ASSERT(erts_monitor_is_origin(omon)); + ASSERT(!erts_monitor_is_in_table(omon)); + if (!erts_monitor_is_in_table(&mdp->target)) + erts_monitor_release(omon); + else { + ErtsMonitor *tmon = &mdp->target; + ASSERT(tmon->type == type); + if (type == ERTS_MON_TYPE_DIST_PROC) + erts_monitor_tree_delete(&ERTS_P_MONITORS(c_p), tmon); + else { + erts_monitor_list_delete(&ERTS_P_LT_MONITORS(c_p), tmon); + if (type == ERTS_MON_TYPE_RESOURCE) { + erts_nif_demonitored((ErtsResource *) tmon->other.ptr); + cnt++; + } + } + erts_monitor_release_both(mdp); + cnt++; + } + cnt++; + } + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_LINK: { + ErtsLink *rlnk, *lnk = (ErtsLink *) sig; + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + remove_nm_sig(c_p, sig, next_nm_sig); + rlnk = erts_link_tree_insert_addr_replace(&ERTS_P_LINKS(c_p), + lnk); + if (!rlnk) { + if (tracing.procs) + getting_linked(c_p, lnk->other.item); + } + else { + if (rlnk->type != ERTS_LNK_TYPE_DIST_PROC) + erts_link_release(rlnk); + else { + ErtsLinkData *ldp; + ErtsLink *dlnk = erts_link_to_other(rlnk, &ldp); + if (erts_link_dist_delete(dlnk)) + erts_link_release_both(ldp); + else + erts_link_release(rlnk); + } + } + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_UNLINK: { + Uint16 type = ERTS_PROC_SIG_TYPE(tag); + ErtsLinkData *ldp; + ErtsLink *llnk; + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + remove_nm_sig(c_p, sig, next_nm_sig); + if (type == ERTS_SIG_Q_TYPE_DIST_LINK) { + ErtsSigDistLinkOp *sdlnk = (ErtsSigDistLinkOp *) sig; + ASSERT(type == ERTS_SIG_Q_TYPE_DIST_LINK); + ASSERT(is_external_pid(sdlnk->remote)); + llnk = erts_link_tree_lookup(ERTS_P_LINKS(c_p), sdlnk->remote); + if (llnk) { + ErtsLink *dlnk = erts_link_to_other(llnk, &ldp); + erts_link_tree_delete(&ERTS_P_LINKS(c_p), llnk); + if (erts_link_dist_delete(dlnk)) + erts_link_release_both(ldp); + else + erts_link_release(llnk); + cnt += 8; + if (tracing.procs) + getting_unlinked(c_p, sdlnk->remote); + } + destroy_sig_dist_link_op(sdlnk); + cnt++; + } + else { + ErtsLinkData *ldp; + ErtsLink *dlnk, *slnk; + slnk = (ErtsLink *) sig; + llnk = erts_link_to_other(slnk, &ldp); + dlnk = erts_link_tree_key_delete(&ERTS_P_LINKS(c_p), llnk); + if (!dlnk) + erts_link_release(slnk); + else { + if (tracing.procs) + getting_unlinked(c_p, llnk->other.item); + if (dlnk == llnk) + erts_link_release_both(ldp); + else { + erts_link_release(slnk); + erts_link_release(dlnk); + } + } + cnt += 2; + } + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_GROUP_LEADER: { + ErtsSigGroupLeader *sgl = (ErtsSigGroupLeader *) sig; + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + remove_nm_sig(c_p, sig, next_nm_sig); + handle_group_leader(c_p, sgl); + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + } + + case ERTS_SIG_Q_OP_IS_ALIVE: + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + remove_nm_sig(c_p, sig, next_nm_sig); + is_alive_response(c_p, sig, !0); + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + + case ERTS_SIG_Q_OP_PROCESS_INFO: + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + handle_process_info(c_p, &tracing, sig, next_nm_sig, !0); + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + break; + + case ERTS_SIG_Q_OP_TRACE_CHANGE_STATE: { + Uint16 type = ERTS_PROC_SIG_TYPE(tag); + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + msg_tracing = handle_trace_change_state(c_p, &tracing, + type, sig, + next_nm_sig); + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, &tracing, next_nm_sig); + + break; + } + + default: + ERTS_INTERNAL_ERROR("Unknown signal"); + break; + } + + cnt++; + + } while (cnt <= limit || stretch_limit(c_p, &tracing, abs_lim, &limit)); + +stop: { + int deferred_save, deferred_saved_last, res; + + deferred_saved_last = !!(c_p->flags & F_DEFERRED_SAVED_LAST); + deferred_save = 0; + + if (!deferred_saved_last) + deferred_save = 0; + else { + if (c_p->sig_qs.saved_last == &c_p->sig_qs.cont) { + c_p->sig_qs.saved_last = c_p->sig_qs.last; + c_p->flags &= ~F_DEFERRED_SAVED_LAST; + deferred_saved_last = deferred_save = 0; + } + else { + if (c_p->sig_qs.save == c_p->sig_qs.last) + deferred_save = !0; + else + deferred_save = 0; + } + } + + ASSERT(c_p->sig_qs.saved_last != &c_p->sig_qs.cont); + + if (ERTS_UNLIKELY(msg_tracing != 0)) { + /* + * All messages that has been traced should + * be moved to inner queue. Next signal in + * middle queue should either be next message + * to trace or next non-message signal. + */ + ASSERT(tracing.messages.next); + if (*next_nm_sig) { + if (*next_nm_sig == tracing.messages.next) + *next_nm_sig = &c_p->sig_qs.cont; + if (c_p->sig_qs.nmsigs.last == tracing.messages.next) + c_p->sig_qs.nmsigs.last = &c_p->sig_qs.cont; + *statep = erts_atomic32_read_nob(&c_p->state); + } + else { + ASSERT(!c_p->sig_qs.nmsigs.next); + c_p->sig_qs.nmsigs.last = NULL; + state = erts_atomic32_read_band_nob(&c_p->state, + ~ERTS_PSFLG_SIG_Q); + state &= ~ERTS_PSFLG_SIG_Q; + *statep = state; + } + + if (tracing.messages.next != &c_p->sig_qs.cont) { + *c_p->sig_qs.last = c_p->sig_qs.cont; + c_p->sig_qs.last = tracing.messages.next; + + c_p->sig_qs.cont = *tracing.messages.next; + if (!c_p->sig_qs.cont) + c_p->sig_qs.cont_last = &c_p->sig_qs.cont; + *c_p->sig_qs.last = NULL; + } + + res = !c_p->sig_qs.cont; + } + else if (*next_nm_sig) { + /* + * All messages prior to next non-message + * signal should be moved to inner queue. + * Next non-message signal to handle should + * be first in middle queue. + */ + ASSERT(**next_nm_sig); + if (*next_nm_sig != &c_p->sig_qs.cont) { + *c_p->sig_qs.last = c_p->sig_qs.cont; + c_p->sig_qs.last = *next_nm_sig; + + c_p->sig_qs.cont = **next_nm_sig; + if (c_p->sig_qs.nmsigs.last == *next_nm_sig) + c_p->sig_qs.nmsigs.last = &c_p->sig_qs.cont; + *next_nm_sig = &c_p->sig_qs.cont; + *c_p->sig_qs.last = NULL; + } + + ASSERT(c_p->sig_qs.cont); + + *statep = erts_atomic32_read_nob(&c_p->state); + + res = 0; + } + else { + /* + * All non-message signals handled. All + * messages should be moved to inner queue. + * Middle queue should be empty. + */ + ASSERT(!c_p->sig_qs.nmsigs.next); + c_p->sig_qs.nmsigs.last = NULL; + + if (c_p->sig_qs.cont_last != &c_p->sig_qs.cont) { + ASSERT(!*c_p->sig_qs.last); + *c_p->sig_qs.last = c_p->sig_qs.cont; + c_p->sig_qs.last = c_p->sig_qs.cont_last; + ASSERT(!*c_p->sig_qs.last); + + c_p->sig_qs.cont_last = &c_p->sig_qs.cont; + c_p->sig_qs.cont = NULL; + } + + ASSERT(!c_p->sig_qs.cont); + + state = erts_atomic32_read_band_nob(&c_p->state, + ~ERTS_PSFLG_SIG_Q); + state &= ~ERTS_PSFLG_SIG_Q; + *statep = state; + res = !0; + } + + if (deferred_saved_last + && (c_p->sig_qs.saved_last == &c_p->sig_qs.cont)) { + c_p->sig_qs.saved_last = c_p->sig_qs.last; + c_p->flags &= ~F_DEFERRED_SAVED_LAST; + if (deferred_save) + c_p->sig_qs.save = c_p->sig_qs.saved_last; + } + else if (!res) { + if (deferred_save) { + c_p->sig_qs.save = c_p->sig_qs.last; + ASSERT(!PEEK_MESSAGE(c_p)); + } + } + else { + c_p->flags &= ~F_DEFERRED_SAVED_LAST; + if (deferred_save) + c_p->sig_qs.save = c_p->sig_qs.saved_last; + } + + ERTS_HDBG_CHECK_SIGNAL_PRIV_QUEUE(c_p, 0); + + *redsp = cnt/4 + 1; + + return res; + } +} + +static int +stretch_limit(Process *c_p, ErtsSigRecvTracing *tp, + int abs_lim, int *limp) +{ + int lim; + /* + * Stretch limit up to a maximum of 'abs_lim' if + * there currently are no messages available to + * inspect by 'receive' and it might be possible + * to get messages available by processing + * signals (or trace messages). + */ + + lim = *limp; + ASSERT(abs_lim >= lim); + if (abs_lim == lim) + return 0; + + if (!(c_p->flags & F_DEFERRED_SAVED_LAST)) { + ErtsSignal *sig; + + if (PEEK_MESSAGE(c_p)) + return 0; + sig = (ErtsSignal *) c_p->sig_qs.cont; + if (!sig) + return 0; /* No signals to process available... */ + if (ERTS_SIG_IS_MSG(sig) && tp->messages.next != &c_p->sig_qs.cont) + return 0; + } + + lim += ERTS_SIG_REDS_CNT_FACTOR*100; + if (lim > abs_lim) + lim = abs_lim; + *limp = lim; + return !0; +} + + +int +erts_proc_sig_handle_exit(Process *c_p, int *redsp) +{ + int cnt, limit; + ErtsMessage *sig, ***next_nm_sig; + + ERTS_HDBG_CHECK_SIGNAL_PRIV_QUEUE(c_p, 0); + ERTS_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) == ERTS_PROC_LOCK_MAIN); + + ASSERT(!(ERTS_PSFLG_SIG_IN_Q & erts_atomic32_read_nob(&c_p->state))); + + limit = *redsp; + limit *= ERTS_SIG_REDS_CNT_FACTOR; + + *redsp = 1; + + next_nm_sig = &c_p->sig_qs.nmsigs.next; + + if (!*next_nm_sig) { + ASSERT(!c_p->sig_qs.nmsigs.last); + return !0; /* done... */ + } + + cnt = 0; + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, NULL, next_nm_sig); + + do { + Eterm tag; + Uint16 type; + int op; + + sig = **next_nm_sig; + + ASSERT(sig); + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + + tag = ((ErtsSignal *) sig)->common.tag; + type = ERTS_PROC_SIG_TYPE(tag); + op = ERTS_PROC_SIG_OP(tag); + + remove_nm_sig(c_p, sig, next_nm_sig); + + ERTS_PROC_SIG_HDBG_PRIV_CHKQ(c_p, NULL, next_nm_sig); + + cnt++; + + switch (op) { + + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: + case ERTS_SIG_Q_OP_MONITOR_DOWN: + switch (type) { + case ERTS_SIG_Q_TYPE_GEN_EXIT: + sig->next = NULL; + erts_cleanup_messages(sig); + break; + case ERTS_LNK_TYPE_PORT: + case ERTS_LNK_TYPE_PROC: + case ERTS_LNK_TYPE_DIST_PROC: + erts_link_release((ErtsLink *) sig); + break; + case ERTS_MON_TYPE_PORT: + case ERTS_MON_TYPE_PROC: + case ERTS_MON_TYPE_DIST_PROC: + case ERTS_MON_TYPE_NODE: + erts_monitor_release((ErtsMonitor *) sig); + break; + default: + ERTS_INTERNAL_ERROR("Unexpected sig type"); + break; + } + break; + + case ERTS_SIG_Q_OP_PERSISTENT_MON_MSG: + sig->next = NULL; + erts_cleanup_messages(sig); + break; + + case ERTS_SIG_Q_OP_MONITOR: { + ErtsProcExitContext pectxt = {c_p, am_noproc}; + erts_proc_exit_handle_monitor((ErtsMonitor *) sig, + (void *) &pectxt); + cnt += 4; + break; + } + + case ERTS_SIG_Q_OP_DEMONITOR: + if (type == ERTS_SIG_Q_TYPE_DIST_PROC_DEMONITOR) + destroy_dist_proc_demonitor((ErtsSigDistProcDemonitor *) sig); + else + erts_monitor_release((ErtsMonitor *) sig); + break; + + case ERTS_SIG_Q_OP_LINK: { + ErtsProcExitContext pectxt = {c_p, am_noproc}; + erts_proc_exit_handle_link((ErtsLink *) sig, (void *) &pectxt); + break; + } + + case ERTS_SIG_Q_OP_UNLINK: + if (type == ERTS_SIG_Q_TYPE_DIST_LINK) + destroy_sig_dist_link_op((ErtsSigDistLinkOp *) sig); + else + erts_link_release((ErtsLink *) sig); + break; + + case ERTS_SIG_Q_OP_GROUP_LEADER: { + ErtsSigGroupLeader *sgl = (ErtsSigGroupLeader *) sig; + handle_group_leader(c_p, sgl); + break; + } + + case ERTS_SIG_Q_OP_IS_ALIVE: + is_alive_response(c_p, sig, 0); + break; + + case ERTS_SIG_Q_OP_PROCESS_INFO: + handle_process_info(c_p, NULL, sig, next_nm_sig, 0); + break; + + case ERTS_SIG_Q_OP_TRACE_CHANGE_STATE: + destroy_trace_info((ErtsSigTraceInfo *) sig); + break; + + default: + ERTS_INTERNAL_ERROR("Unknown signal"); + break; + } + + } while (cnt >= limit && *next_nm_sig); + + *redsp += cnt / ERTS_SIG_REDS_CNT_FACTOR; + + if (*next_nm_sig) + return 0; + + ASSERT(!c_p->sig_qs.nmsigs.next); + c_p->sig_qs.nmsigs.last = NULL; + (void) erts_atomic32_read_band_nob(&c_p->state, + ~ERTS_PSFLG_SIG_Q); + return !0; +} + +#ifdef USE_VM_PROBES +# define ERTS_CLEAR_SEQ_TOKEN(MP) \ + ERL_MESSAGE_TOKEN((MP)) = ((ERL_MESSAGE_DT_UTAG((MP)) != NIL) \ + ? am_have_dt_utag : NIL) +#else +# define ERTS_CLEAR_SEQ_TOKEN(MP) \ + ERL_MESSAGE_TOKEN((MP)) = NIL +#endif + +static ERTS_INLINE void +clear_seq_trace_token(ErtsMessage *sig) +{ + if (ERTS_SIG_IS_MSG((ErtsSignal *) sig)) + ERTS_CLEAR_SEQ_TOKEN(sig); + else { + Uint tag; + Uint16 op, type; + + tag = ((ErtsSignal *) sig)->common.tag; + type = ERTS_PROC_SIG_TYPE(tag); + op = ERTS_PROC_SIG_OP(tag); + + switch (op) { + + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: + case ERTS_SIG_Q_OP_MONITOR_DOWN: + switch (type) { + case ERTS_SIG_Q_TYPE_GEN_EXIT: + ERTS_CLEAR_SEQ_TOKEN(sig); + break; + case ERTS_LNK_TYPE_PORT: + case ERTS_LNK_TYPE_PROC: + case ERTS_LNK_TYPE_DIST_PROC: + case ERTS_MON_TYPE_PORT: + case ERTS_MON_TYPE_PROC: + case ERTS_MON_TYPE_DIST_PROC: + case ERTS_MON_TYPE_NODE: + break; + default: + ERTS_INTERNAL_ERROR("Unexpected sig type"); + break; + } + break; + + case ERTS_SIG_Q_OP_PERSISTENT_MON_MSG: + ERTS_CLEAR_SEQ_TOKEN(sig); + break; + + case ERTS_SIG_Q_OP_MONITOR: + case ERTS_SIG_Q_OP_DEMONITOR: + case ERTS_SIG_Q_OP_LINK: + case ERTS_SIG_Q_OP_UNLINK: + case ERTS_SIG_Q_OP_TRACE_CHANGE_STATE: + break; + + default: + ERTS_INTERNAL_ERROR("Unknown signal"); + break; + } + } +} + +void +erts_proc_sig_clear_seq_trace_tokens(Process *c_p) +{ + ASSERT(erts_thr_progress_is_blocking()); + erts_proc_sig_fetch(c_p); + ERTS_FOREACH_SIG_PRIVQS(c_p, sig, clear_seq_trace_token(sig)); +} + +Uint +erts_proc_sig_signal_size(ErtsSignal *sig) +{ + Eterm tag; + Uint16 type; + int op; + Uint size = 0; + + ASSERT(sig); + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + + tag = sig->common.tag; + type = ERTS_PROC_SIG_TYPE(tag); + op = ERTS_PROC_SIG_OP(tag); + + switch (op) { + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: + case ERTS_SIG_Q_OP_MONITOR_DOWN: + switch (type) { + case ERTS_SIG_Q_TYPE_GEN_EXIT: + size = ((ErtsMessage *) sig)->hfrag.alloc_size; + size *= sizeof(Eterm); + size += sizeof(ErtsMessage) - sizeof(Eterm); + break; + case ERTS_LNK_TYPE_PORT: + case ERTS_LNK_TYPE_PROC: + case ERTS_LNK_TYPE_DIST_PROC: + size = erts_link_size((ErtsLink *) sig); + break; + case ERTS_MON_TYPE_PORT: + case ERTS_MON_TYPE_PROC: + case ERTS_MON_TYPE_DIST_PROC: + case ERTS_MON_TYPE_NODE: + size = erts_monitor_size((ErtsMonitor *) sig); + default: + ERTS_INTERNAL_ERROR("Unexpected sig type"); + break; + } + break; + + case ERTS_SIG_Q_OP_PERSISTENT_MON_MSG: + case ERTS_SIG_Q_OP_IS_ALIVE: + size = ((ErtsMessage *) sig)->hfrag.alloc_size; + size *= sizeof(Eterm); + size += sizeof(ErtsMessage) - sizeof(Eterm); + break; + + case ERTS_SIG_Q_OP_DEMONITOR: + if (type == ERTS_SIG_Q_TYPE_DIST_PROC_DEMONITOR) { + size = NC_HEAP_SIZE(((ErtsSigDistProcDemonitor *) sig)->ref); + size--; + size *= sizeof(Eterm); + size += sizeof(ErtsSigDistProcDemonitor); + break; + } + /* Fall through... */ + + case ERTS_SIG_Q_OP_MONITOR: + size = erts_monitor_size((ErtsMonitor *) sig); + break; + + case ERTS_SIG_Q_OP_UNLINK: + if (type == ERTS_SIG_Q_TYPE_DIST_LINK) { + size = NC_HEAP_SIZE(((ErtsSigDistLinkOp *) sig)->remote); + size--; + size *= sizeof(Eterm); + size += sizeof(ErtsSigDistLinkOp); + break; + } + /* Fall through... */ + + case ERTS_SIG_Q_OP_LINK: + size = erts_link_size((ErtsLink *) sig); + break; + + case ERTS_SIG_Q_OP_GROUP_LEADER: { + ErtsSigGroupLeader *sgl = (ErtsSigGroupLeader *) sig; + size = size_object(sgl->group_leader); + size += size_object(sgl->ref); + size *= sizeof(Eterm); + size += sizeof(ErtsSigGroupLeader) - sizeof(Eterm); + break; + } + + case ERTS_SIG_Q_OP_TRACE_CHANGE_STATE: + size = sizeof(ErtsSigTraceInfo); + break; + + case ERTS_SIG_Q_OP_PROCESS_INFO: { + ErtsProcessInfoSig *pisig = (ErtsProcessInfoSig *) sig; + size = sizeof(ErtsProcessInfoSig); + size += (pisig->len - 1) * sizeof(int); + break; + } + + default: + ERTS_INTERNAL_ERROR("Unknown signal"); + break; + } + + return size; +} + +int +erts_proc_sig_receive_helper(Process *c_p, + int fcalls, + int neg_o_reds, + ErtsMessage **msgpp, + int *get_outp) +{ + ErtsMessage *msgp; + int reds, consumed_reds, left_reds, max_reds; + + /* + * Called from the loop-rec instruction when receive + * has reached end of inner (private) queue. This function + * tries to move more messages into the inner queue + * for the receive to handle. This by, processing the + * middle (private) queue and/or moving signals from + * the outer (public) queue into the middle queue. + * + * If this function succeeds in making more messages + * available in the inner queue, *msgpp points to next + * message. If *msgpp is set to NULL when: + * -- process became exiting. *get_outp is set to a + * value greater than zero. + * -- process needs to yield. *get_outp is set to a + * value less than zero. + * -- no more messages exist in any of the queues. + * *get_outp is set to zero and the message queue + * lock remains locked. This so the process can + * make its way to the appropriate wait instruction + * without racing with new incoming messages. + */ + + ASSERT(erts_proc_lc_my_proc_locks(c_p) == ERTS_PROC_LOCK_MAIN); + ASSERT(!ERTS_PROC_IS_EXITING(c_p)); + ASSERT(!*msgpp); + + left_reds = fcalls - neg_o_reds; + consumed_reds = 0; + + while (!0) { + erts_aint32_t state; + + if (!c_p->sig_qs.cont) { + + consumed_reds += 4; + left_reds -= 4; + erts_proc_lock(c_p, ERTS_PROC_LOCK_MSGQ); + erts_proc_sig_fetch(c_p); + /* + * Messages may have been moved directly to + * inner queue... + */ + msgp = PEEK_MESSAGE(c_p); + if (msgp) { + erts_proc_unlock(c_p, ERTS_PROC_LOCK_MSGQ); + *get_outp = 0; + *msgpp = msgp; + return consumed_reds; + } + + if (!c_p->sig_qs.cont) { + /* + * No messages! Return with message queue + * locked and let the process continue + * to wait instruction... + */ + *get_outp = 0; + *msgpp = NULL; + return consumed_reds; + } + erts_proc_unlock(c_p, ERTS_PROC_LOCK_MSGQ); + + if (left_reds <= 0) { + *get_outp = -1; /* yield */ + *msgpp = NULL; + + ASSERT(consumed_reds >= (fcalls - neg_o_reds)); + return consumed_reds; + } + + /* handle newly arrived signals... */ + } + + reds = ERTS_SIG_HANDLE_REDS_MAX_PREFERED; +#ifdef DEBUG + /* test that it works also with very few reds */ + max_reds = left_reds; + if (reds > left_reds) + reds = left_reds; +#else + /* At least work preferred amount of reds... */ + max_reds = left_reds; + if (max_reds < reds) + max_reds = reds; +#endif + (void) erts_proc_sig_handle_incoming(c_p, &state, &reds, + max_reds, !0); + consumed_reds += reds; + left_reds -= reds; + /* we may have exited by an incoming signal... */ + if (state & ERTS_PSFLG_EXITING) { + /* + * Process need to schedule out in order + * to terminate. Prepare this a bit... + */ + ASSERT(c_p->flags & F_DELAY_GC); + + c_p->flags &= ~F_DELAY_GC; + c_p->arity = 0; + c_p->current = NULL; + *get_outp = 1; + *msgpp = NULL; + return consumed_reds; + } + + msgp = PEEK_MESSAGE(c_p); + if (msgp) { + *get_outp = 0; + *msgpp = msgp; + return consumed_reds; + } + + if (left_reds <= 0) { + *get_outp = -1; /* yield */ + *msgpp = NULL; + + ASSERT(consumed_reds >= (fcalls - neg_o_reds)); + return consumed_reds; + } + + ASSERT(!c_p->sig_qs.cont); + /* Go fetch again... */ + } +} + +static int +handle_trace_change_state(Process *c_p, + ErtsSigRecvTracing *tracing, + Uint16 type, + ErtsMessage *sig, + ErtsMessage ***next_nm_sig) +{ + ErtsSigTraceInfo *trace_info = (ErtsSigTraceInfo *) sig; + ErtsMessage **next = *next_nm_sig; + int msgs_active, old_msgs_active = !!tracing->messages.active; + + ASSERT(sig == *next); + + erts_proc_lock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); + + ERTS_TRACE_FLAGS(c_p) |= trace_info->flags_on; + ERTS_TRACE_FLAGS(c_p) &= ~trace_info->flags_off; + if (is_value(trace_info->tracer)) + erts_tracer_replace(&c_p->common, trace_info->tracer); + + erts_proc_unlock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); + + remove_nm_sig(c_p, sig, next_nm_sig); + destroy_trace_info(trace_info); + /* + * Adjust tracing state according to modifications made by + * the trace info signal... + */ + adjust_tracing_state(c_p, tracing, 0); + msgs_active = !!tracing->messages.active; + + if (old_msgs_active ^ msgs_active) { + if (msgs_active) { + ASSERT(!tracing->messages.next); + tracing->messages.next = next; + } + else { + ASSERT(tracing->messages.next); + tracing->messages.next = NULL; + } + } + + ASSERT(!msgs_active || tracing->messages.next); + + return msgs_active; +} + +static void +getting_unlinked(Process *c_p, Eterm unlinker) +{ + trace_proc(c_p, ERTS_PROC_LOCK_MAIN, c_p, + am_getting_unlinked, unlinker); +} + +static void +getting_linked(Process *c_p, Eterm linker) +{ + trace_proc(c_p, ERTS_PROC_LOCK_MAIN, c_p, + am_getting_linked, linker); +} + +static ERTS_INLINE void +handle_message_enqueued_tracing(Process *c_p, + ErtsSigRecvTracing *tracing, + ErtsMessage *msg) +{ + ASSERT(ERTS_SIG_IS_INTERNAL_MSG(msg)); + +#if defined(USE_VM_PROBES) + if (tracing->messages.vm_probes && DTRACE_ENABLED(message_queued)) { + Sint tok_label = 0; + Sint tok_lastcnt = 0; + Sint tok_serial = 0; + Sint len = erts_proc_sig_privqs_len(c_p); + Eterm seq_trace_token = ERL_MESSAGE_TOKEN(msg); + + if (seq_trace_token != NIL && is_tuple(seq_trace_token)) { + tok_label = SEQ_TRACE_T_DTRACE_LABEL(seq_trace_token); + tok_lastcnt = signed_val(SEQ_TRACE_T_LASTCNT(seq_trace_token)); + tok_serial = signed_val(SEQ_TRACE_T_SERIAL(seq_trace_token)); + } + /* Message intentionally not passed... */ + DTRACE6(message_queued, + tracing->messages.receiver_name, + size_object(ERL_MESSAGE_TERM(msg)), + len, /* This is NOT message queue len, but its something... */ + tok_label, tok_lastcnt, tok_serial); + } +#endif + + if (tracing->messages.receive_trace && tracing->messages.event->on) { + ASSERT(IS_TRACED(c_p)); + trace_receive(c_p, + ERL_MESSAGE_FROM(msg), + ERL_MESSAGE_TERM(msg), + tracing->messages.event); + } +} + +static int +handle_msg_tracing(Process *c_p, ErtsSigRecvTracing *tracing, + ErtsMessage ***next_nm_sig) +{ + ErtsMessage **next_sig, *sig; + int cnt = 0, limit = ERTS_PROC_SIG_TRACE_COUNT_LIMIT; + + ASSERT(tracing->messages.next); + next_sig = tracing->messages.next; + sig = *next_sig; + + /* + * Receive tracing active. Handle all messages + * until next non-message signal... + */ + + while (sig && ERTS_SIG_IS_MSG(sig)) { + if (cnt > limit) { + tracing->messages.next = next_sig; + return -1; /* Yield... */ + } + if (ERTS_SIG_IS_EXTERNAL_MSG(sig)) { + cnt++; + if (!erts_decode_dist_message(c_p, ERTS_PROC_LOCK_MAIN, + sig, 0)) { + /* Bad dist message; remove it... */ + remove_mq_m_sig(c_p, sig, next_sig, next_nm_sig); + sig = *next_sig; + continue; + } + } + handle_message_enqueued_tracing(c_p, tracing, sig); + cnt++; + + next_sig = &(*next_sig)->next; + sig = *next_sig; + } + + tracing->messages.next = next_sig; + + if (!sig) { + ASSERT(!*next_nm_sig); + return 1; /* end... */ + } + + ASSERT(*next_nm_sig); + ASSERT(**next_nm_sig == sig); + + /* Next signal a non-message signal... */ + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + + /* + * Return and handle the non-message signal... + */ + + return 0; +} + +Uint +erts_proc_sig_prep_msgq_for_inspection(Process *c_p, + Process *rp, + ErtsProcLocks rp_locks, + int info_on_self, + ErtsMessageInfo *mip) +{ + Uint tot_heap_size; + ErtsMessage *mp, **mpp; + Sint i; + int self_on_heap; + + /* + * Prepare the message queue (inner signal queue) + * for inspection by process_info(). + * + * - Decode all messages on external format + * - Remove all corrupt dist messages from queue + * - Save pointer to, and heap size need of each + * message in the mip array. + * - Return total heap size need for all messages + * that needs to be copied. + * + */ + + ASSERT(!info_on_self || c_p == rp); + + self_on_heap = info_on_self && !(c_p->flags & F_OFF_HEAP_MSGQ); + + tot_heap_size = 0; + i = 0; + mpp = &rp->sig_qs.first; + mp = rp->sig_qs.first; + while (mp) { + Eterm msg = ERL_MESSAGE_TERM(mp); + + mip[i].size = 0; + + if (ERTS_SIG_IS_EXTERNAL_MSG(mp)) { + /* decode it... */ + if (mp->data.attached) + erts_decode_dist_message(rp, rp_locks, mp, !0); + + msg = ERL_MESSAGE_TERM(mp); + + if (is_non_value(msg)) { + ErtsMessage *bad_mp = mp; + /* + * Bad distribution message; remove + * it from the queue... + */ + ASSERT(!mp->data.attached); + + ASSERT(*mpp == bad_mp); + + remove_iq_m_sig(rp, mp, mpp); + + mp = *mpp; + + bad_mp->next = NULL; + erts_cleanup_messages(bad_mp); + continue; + } + } + + ASSERT(is_value(msg)); + + if (is_not_immed(msg) && (!self_on_heap || mp->data.attached)) { + Uint sz = size_object(msg); + mip[i].size = sz; + tot_heap_size += sz; + } + + mip[i].msgp = mp; + i++; + mpp = &mp->next; + mp = mp->next; + } + + ASSERT(c_p->sig_qs.len == i); + + return tot_heap_size; +} + +static ERTS_INLINE void +move_msg_to_heap(Process *c_p, ErtsMessage *mp) +{ + /* + * We leave not yet decoded distribution messages + * as they are in the queue since it is not + * possible to determine a maximum size until + * actual decoding... + * + * We also leave combined messages as they are... + */ + if (ERTS_SIG_IS_INTERNAL_MSG(mp) + && mp->data.attached + && mp->data.attached != ERTS_MSG_COMBINED_HFRAG) { + ErlHeapFragment *bp; + + bp = erts_message_to_heap_frag(mp); + + if (bp->next) + erts_move_multi_frags(&c_p->htop, &c_p->off_heap, bp, + mp->m, ERL_MESSAGE_REF_ARRAY_SZ, 0); + else + erts_copy_one_frag(&c_p->htop, &c_p->off_heap, bp, + mp->m, ERL_MESSAGE_REF_ARRAY_SZ); + + mp->data.heap_frag = NULL; + free_message_buffer(bp); + } +} + +void +erts_proc_sig_move_msgs_to_heap(Process *c_p) +{ + ERTS_HDBG_CHECK_SIGNAL_PRIV_QUEUE(c_p, 0); + + ERTS_FOREACH_SIG_PRIVQS(c_p, sig, move_msg_to_heap(c_p, sig)); + + ERTS_HDBG_CHECK_SIGNAL_PRIV_QUEUE(c_p, 0); +} + + +BIF_RETTYPE +erts_internal_dirty_process_handle_signals_1(BIF_ALIST_1) +{ + erts_aint32_t state, dirty, noproc; + int busy; + Process *rp; + + if (BIF_P != erts_dirty_process_signal_handler + && BIF_P != erts_dirty_process_signal_handler_high + && BIF_P != erts_dirty_process_signal_handler_max) + BIF_ERROR(BIF_P, EXC_NOTSUP); + + if (is_not_internal_pid(BIF_ARG_1)) + BIF_RET(am_false); + + rp = erts_proc_lookup_raw(BIF_ARG_1); + if (!rp) + BIF_RET(am_noproc); + + state = erts_atomic32_read_nob(&rp->state); + dirty = (state & (ERTS_PSFLG_DIRTY_RUNNING + | ERTS_PSFLG_DIRTY_RUNNING_SYS)); + if (!dirty) + BIF_RET(am_normal); + + busy = erts_proc_trylock(rp, ERTS_PROC_LOCK_MAIN) == EBUSY; + + state = erts_atomic32_read_mb(&rp->state); + noproc = (state & ERTS_PSFLG_FREE); + dirty = (state & (ERTS_PSFLG_DIRTY_RUNNING + | ERTS_PSFLG_DIRTY_RUNNING_SYS)); + + if (busy) { + if (noproc) + BIF_RET(am_noproc); + if (dirty) + BIF_RET(am_more); /* try again... */ + BIF_RET(am_normal); /* will handle signals itself... */ + } + else { + erts_aint32_t state; + int done; + Eterm res = am_false; + int reds = 0; + + if (noproc) + res = am_noproc; + else if (!dirty) + res = am_normal; /* will handle signals itself... */ + else { + reds = ERTS_BIF_REDS_LEFT(BIF_P); + done = erts_proc_sig_handle_incoming(rp, &state, &reds, + reds, 0); + if (done || (state & ERTS_PSFLG_EXITING)) + res = am_ok; + else + res = am_more; + } + + erts_proc_unlock(rp, ERTS_PROC_LOCK_MAIN); + + if (reds) + BUMP_REDS(BIF_P, reds); + + BIF_RET(res); + } +} + +static void +debug_foreach_sig_heap_frags(ErlHeapFragment *hfrag, + void (*oh_func)(ErlOffHeap *, void *), + void *arg) +{ + ErlHeapFragment *hf = hfrag; + while (hf) { + oh_func(&(hf->off_heap), arg); + hf = hf->next; + } +} + +static void +debug_foreach_sig_fake_oh(Eterm term, + void (*oh_func)(ErlOffHeap *, void *), + void *arg) +{ + if (is_external(term)) { + ErlOffHeap oh; + oh.overhead = 0; + oh.first = ((struct erl_off_heap_header *) + (char *) external_thing_ptr(term)); + ASSERT(!oh.first->next); + oh_func(&oh, arg); + } + +} + +void +erts_proc_sig_debug_foreach_sig(Process *c_p, + void (*msg_func)(ErtsMessage *, void *), + void (*oh_func)(ErlOffHeap *, void *), + void (*mon_func)(ErtsMonitor *, void *), + void (*lnk_func)(ErtsLink *, void *), + void *arg) +{ + ErtsMessage *queue[] = {c_p->sig_qs.first, c_p->sig_qs.cont, c_p->sig_inq.first}; + int qix; + + for (qix = 0; qix < sizeof(queue)/sizeof(queue[0]); qix++) { + ErtsMessage *sig; + for (sig = queue[qix]; sig; sig = sig->next) { + + if (ERTS_SIG_IS_MSG(sig)) + msg_func(sig, arg); + else { + Eterm tag; + Uint16 type; + int op; + + ASSERT(sig); + ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + + tag = ((ErtsSignal *) sig)->common.tag; + type = ERTS_PROC_SIG_TYPE(tag); + op = ERTS_PROC_SIG_OP(tag); + + switch (op) { + + case ERTS_SIG_Q_OP_EXIT: + case ERTS_SIG_Q_OP_EXIT_LINKED: + case ERTS_SIG_Q_OP_MONITOR_DOWN: + switch (type) { + case ERTS_SIG_Q_TYPE_GEN_EXIT: + debug_foreach_sig_heap_frags(&sig->hfrag, oh_func, arg); + break; + case ERTS_LNK_TYPE_PORT: + case ERTS_LNK_TYPE_PROC: + case ERTS_LNK_TYPE_DIST_PROC: + lnk_func((ErtsLink *) sig, arg); + break; + case ERTS_MON_TYPE_PORT: + case ERTS_MON_TYPE_PROC: + case ERTS_MON_TYPE_DIST_PROC: + case ERTS_MON_TYPE_NODE: + mon_func((ErtsMonitor *) sig, arg); + break; + default: + ERTS_INTERNAL_ERROR("Unexpected sig type"); + break; + } + break; + + case ERTS_SIG_Q_OP_PERSISTENT_MON_MSG: + debug_foreach_sig_heap_frags(&sig->hfrag, oh_func, arg); + break; + + case ERTS_SIG_Q_OP_DEMONITOR: + if (type == ERTS_SIG_Q_TYPE_DIST_PROC_DEMONITOR) { + debug_foreach_sig_fake_oh(((ErtsSigDistProcDemonitor *) sig)->ref, + oh_func, arg); + break; + } + /* Fall through... */ + + case ERTS_SIG_Q_OP_MONITOR: + mon_func((ErtsMonitor *) sig, arg); + break; + + case ERTS_SIG_Q_OP_UNLINK: + if (type == ERTS_SIG_Q_TYPE_DIST_LINK) { + debug_foreach_sig_fake_oh(((ErtsSigDistLinkOp *) sig)->remote, + oh_func, arg); + break; + } + /* Fall through... */ + + case ERTS_SIG_Q_OP_LINK: + lnk_func((ErtsLink *) sig, arg); + break; + + case ERTS_SIG_Q_OP_GROUP_LEADER: { + ErtsSigGroupLeader *sgl = (ErtsSigGroupLeader *) sig; + oh_func(&sgl->oh, arg); + break; + } + + case ERTS_SIG_Q_OP_IS_ALIVE: + case ERTS_SIG_Q_OP_TRACE_CHANGE_STATE: + case ERTS_SIG_Q_OP_PROCESS_INFO: + break; + + default: + ERTS_INTERNAL_ERROR("Unknown signal"); + break; + } + + } + } + } +} + +#ifdef ERTS_PROC_SIG_HARD_DEBUG + +static void +chk_eterm(Process *c_p, int privq, ErtsMessage *mp, Eterm term) +{ + ErlHeapFragment *bp; + Eterm *ptr = NULL; + + switch (primary_tag(term)) { + case TAG_PRIMARY_IMMED1: + return; + case TAG_PRIMARY_LIST: + ptr = list_val(term); + ERTS_ASSERT(!is_header(CAR(ptr))); + ERTS_ASSERT(!is_header(CDR(ptr))); + break; + case TAG_PRIMARY_BOXED: + ptr = boxed_val(term); + ERTS_ASSERT(is_header(*ptr)); + break; + case TAG_PRIMARY_HEADER: + default: + ERTS_INTERNAL_ERROR("Not valid term"); + break; + } + + if (erts_is_literal(term, ptr)) + return; + + for (bp = erts_message_to_heap_frag(mp); bp; bp = bp->next) { + if (bp->mem <= ptr && ptr < bp->mem + bp->used_size) + return; + } + + ASSERT(erts_dbg_within_proc(ptr, c_p, NULL)); +} + +static Sint +proc_sig_hdbg_check_queue(Process *proc, + int privq, + ErtsMessage **sig_next, + ErtsMessage **sig_last, + ErtsMessage **sig_nm_next, + ErtsMessage **sig_nm_last, + ErtsSigRecvTracing *tracing, + int *found_saved_last_p, + erts_aint32_t sig_psflg) +{ + ErtsMessage **next, *sig, **nm_next, **nm_last; + int last_nm_sig_found, nm_sigs = 0, found_next_trace = 0, + found_save = 0, last_sig_found = 0, found_saved_last = 0; + Sint msg_len = 0; + ErtsMessage **next_trace = tracing ? tracing->messages.next : NULL; + ErtsMessage **save = proc->sig_qs.save; + ErtsMessage **saved_last = proc->sig_qs.saved_last; + + if (!privq) { + ErtsSignal *sig = (ErtsSignal *) *sig_next; + if (sig->common.tag == ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK) { + + } + } + + nm_next = sig_nm_next; + nm_last = sig_nm_last; + next = sig_next; + sig = *sig_next; + + last_nm_sig_found = !nm_last; + if (last_nm_sig_found) + ERTS_ASSERT(!nm_next); + else + ERTS_ASSERT(nm_next); + + while (1) { + ErtsSignal *nm_sig; + + if (next == sig_last) { + ASSERT(!*next); + last_sig_found = 1; + } + + if (next == save) + found_save = 1; + + if (next == saved_last) + found_saved_last = 1; + + if (next == next_trace) { + found_next_trace = 1; + ERTS_ASSERT(nm_sigs == 0); + } + + while (sig && ERTS_SIG_IS_MSG(sig)) { + int i; + if (ERTS_SIG_IS_EXTERNAL_MSG(sig)) + i = 1; + else + i = 0; + for (; i < ERL_MESSAGE_REF_ARRAY_SZ; i++) + chk_eterm(proc, privq, sig, sig->m[i]); + + msg_len++; + next = &sig->next; + sig = sig->next; + + if (next == sig_last) { + ASSERT(!*next); + last_sig_found = 1; + } + + if (next == save) + found_save = 1; + + if (next == saved_last) + found_saved_last = 1; + + if (next == next_trace) { + found_next_trace = 1; + ERTS_ASSERT(nm_sigs == 0); + } + } + + if (!sig) + break; + + nm_sig = (ErtsSignal *) sig; + + if (nm_sig->common.tag == ERTS_PROC_SIG_MSGQ_LEN_OFFS_MARK) { + ERTS_ASSERT(!privq); + ERTS_ASSERT(sig == *sig_next); + } + else { + nm_sigs++; + + ERTS_ASSERT(!last_nm_sig_found); + ERTS_ASSERT(ERTS_SIG_IS_NON_MSG(sig)); + + ERTS_ASSERT(nm_next == next); + + if (nm_last == next) { + ASSERT(!nm_sig->common.specific.next); + last_nm_sig_found = 1; + } + + nm_next = nm_sig->common.specific.next; + + } + + next = &nm_sig->common.next; + sig = nm_sig->common.next; + + } + + if (!privq) { + /* outer queue */ + ERTS_ASSERT(!found_save); + ERTS_ASSERT(!found_saved_last); + } + else if (privq > 0) { + /* middle queue */ + ERTS_ASSERT(!next_trace || found_next_trace); + ERTS_ASSERT(!found_save); + if (!found_saved_last_p) { + ERTS_ASSERT(!found_saved_last + || (proc->flags & F_DEFERRED_SAVED_LAST)); + } + else { + if (*found_saved_last_p) { + ERTS_ASSERT(!found_saved_last); + ERTS_ASSERT(!(proc->flags & F_DEFERRED_SAVED_LAST)); + } + else if (saved_last) { + ERTS_ASSERT(found_saved_last); + ERTS_ASSERT(proc->flags & F_DEFERRED_SAVED_LAST); + } + *found_saved_last_p |= found_saved_last; + } + } + else { + /* inner queue */ + ERTS_ASSERT(!found_next_trace); + ERTS_ASSERT(nm_sigs == 0); + ERTS_ASSERT(found_save); + ERTS_ASSERT(!saved_last + || (found_saved_last + || (proc->flags & F_DEFERRED_SAVED_LAST))); + if (found_saved_last_p) + *found_saved_last_p |= found_saved_last; + } + + ERTS_ASSERT(last_nm_sig_found); + ERTS_ASSERT(last_sig_found); + + if (sig_psflg != ERTS_PSFLG_FREE) { + erts_aint32_t state = erts_atomic32_read_nob(&proc->state); + ERTS_ASSERT(nm_sigs ? !!(state & sig_psflg) : !(state & sig_psflg)); + } + + return msg_len; +} + +void +erts_proc_sig_hdbg_check_priv_queue(Process *p, int qlock, char *what, char *file, int line) +{ + int found_saved_last = 0; + Sint len, len1, len2; + ERTS_LC_ASSERT(erts_thr_progress_is_blocking() + || ERTS_PROC_IS_EXITING(p) + || (ERTS_PROC_LOCK_MAIN + & erts_proc_lc_my_proc_locks(p))); + len1 = proc_sig_hdbg_check_queue(p, + -1, + &p->sig_qs.first, + p->sig_qs.last, + NULL, + NULL, + NULL, + &found_saved_last, + ERTS_PSFLG_FREE); + len2 = proc_sig_hdbg_check_queue(p, + 1, + &p->sig_qs.cont, + p->sig_qs.cont_last, + p->sig_qs.nmsigs.next, + p->sig_qs.nmsigs.last, + NULL, + &found_saved_last, + ERTS_PSFLG_SIG_Q); + if (p->sig_qs.saved_last) + ERTS_ASSERT(found_saved_last); + len = proc_sig_privqs_len(p, qlock); + ERTS_ASSERT(len == len1 + len2); +} + +void +erts_proc_sig_hdbg_check_in_queue(Process *p, char *what, char *file, int line) +{ + Sint len; + ERTS_LC_ASSERT(erts_thr_progress_is_blocking() + || ERTS_PROC_IS_EXITING(p) + || (ERTS_PROC_LOCK_MSGQ + & erts_proc_lc_my_proc_locks(p))); + len = proc_sig_hdbg_check_queue(p, + 0, + &p->sig_inq.first, + p->sig_inq.last, + p->sig_inq.nmsigs.next, + p->sig_inq.nmsigs.last, + NULL, + NULL, + ERTS_PSFLG_SIG_IN_Q); + ASSERT(p->sig_inq.len == len); (void)len; +} + +#endif /* ERTS_PROC_SIG_HARD_DEBUG */ |