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-rw-r--r--erts/emulator/beam/erl_bif_timer.c705
1 files changed, 0 insertions, 705 deletions
diff --git a/erts/emulator/beam/erl_bif_timer.c b/erts/emulator/beam/erl_bif_timer.c
deleted file mode 100644
index 03ac97283c..0000000000
--- a/erts/emulator/beam/erl_bif_timer.c
+++ /dev/null
@@ -1,705 +0,0 @@
-/*
- * %CopyrightBegin%
- *
- * Copyright Ericsson AB 2005-2012. All Rights Reserved.
- *
- * The contents of this file are subject to the Erlang Public License,
- * Version 1.1, (the "License"); you may not use this file except in
- * compliance with the License. You should have received a copy of the
- * Erlang Public License along with this software. If not, it can be
- * retrieved online at http://www.erlang.org/.
- *
- * Software distributed under the License is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- * the License for the specific language governing rights and limitations
- * under the License.
- *
- * %CopyrightEnd%
- */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include "erl_bif_timer.h"
-#include "global.h"
-#include "bif.h"
-#include "error.h"
-#include "big.h"
-#include "erl_thr_progress.h"
-
-/****************************************************************************
-** BIF Timer support
-****************************************************************************/
-
-#define BTM_FLG_SL_TIMER (((Uint32) 1) << 0)
-#define BTM_FLG_CANCELED (((Uint32) 1) << 1)
-#define BTM_FLG_HEAD (((Uint32) 1) << 2)
-#define BTM_FLG_BYNAME (((Uint32) 1) << 3)
-#define BTM_FLG_WRAP (((Uint32) 1) << 4)
-
-struct ErtsBifTimer_ {
- struct {
- union {
- ErtsBifTimer **head;
- ErtsBifTimer *prev;
- } u;
- ErtsBifTimer *next;
- } tab;
- union {
- Eterm name;
- struct {
- ErtsBifTimer *prev;
- ErtsBifTimer *next;
- Process *ess;
- } proc;
- } receiver;
- ErlTimer tm;
- ErlHeapFragment* bp;
- Uint32 flags;
- Eterm message;
- Uint32 ref_numbers[ERTS_REF_NUMBERS];
-};
-
-#ifdef SMALL_MEMORY
-#define TIMER_HASH_VEC_SZ 3331
-#define BTM_PREALC_SZ 10
-#else
-#define TIMER_HASH_VEC_SZ 10007
-#define BTM_PREALC_SZ 100
-#endif
-static ErtsBifTimer **bif_timer_tab;
-static Uint no_bif_timers;
-
-
-static erts_smp_rwmtx_t bif_timer_lock;
-
-#define erts_smp_safe_btm_rwlock(P, L) \
- safe_btm_lock((P), (L), 1)
-#define erts_smp_safe_btm_rlock(P, L) \
- safe_btm_lock((P), (L), 0)
-#define erts_smp_btm_rwlock() \
- erts_smp_rwmtx_rwlock(&bif_timer_lock)
-#define erts_smp_btm_tryrwlock() \
- erts_smp_rwmtx_tryrwlock(&bif_timer_lock)
-#define erts_smp_btm_rwunlock() \
- erts_smp_rwmtx_rwunlock(&bif_timer_lock)
-#define erts_smp_btm_rlock() \
- erts_smp_rwmtx_rlock(&bif_timer_lock)
-#define erts_smp_btm_tryrlock() \
- erts_smp_rwmtx_tryrlock(&bif_timer_lock)
-#define erts_smp_btm_runlock() \
- erts_smp_rwmtx_runlock(&bif_timer_lock)
-#define erts_smp_btm_lock_init() \
- erts_smp_rwmtx_init(&bif_timer_lock, "bif_timers")
-
-
-static ERTS_INLINE int
-safe_btm_lock(Process *c_p, ErtsProcLocks c_p_locks, int rw_lock)
-{
- ASSERT(c_p && c_p_locks);
-#ifdef ERTS_SMP
- if ((rw_lock ? erts_smp_btm_tryrwlock() : erts_smp_btm_tryrlock()) != EBUSY)
- return 0;
- erts_smp_proc_unlock(c_p, c_p_locks);
- if (rw_lock)
- erts_smp_btm_rwlock();
- else
- erts_smp_btm_rlock();
- erts_smp_proc_lock(c_p, c_p_locks);
- if (ERTS_PROC_IS_EXITING(c_p)) {
- if (rw_lock)
- erts_smp_btm_rwunlock();
- else
- erts_smp_btm_runlock();
- return 1;
- }
-#endif
- return 0;
-}
-
-ERTS_SCHED_PREF_PALLOC_IMPL(btm_pre, ErtsBifTimer, BTM_PREALC_SZ)
-
-static ERTS_INLINE int
-get_index(Uint32 *ref_numbers, Uint32 len)
-{
- Uint32 hash;
- /* len can potentially be larger than ERTS_REF_NUMBERS
- if it has visited another node... */
- if (len > ERTS_REF_NUMBERS)
- len = ERTS_REF_NUMBERS;
-
-#if ERTS_REF_NUMBERS != 3
-#error "ERTS_REF_NUMBERS changed. Update me..."
-#endif
- switch (len) {
- case 3: if (!ref_numbers[2]) len = 2;
- case 2: if (!ref_numbers[1]) len = 1;
- default: break;
- }
-
- ASSERT(1 <= len && len <= ERTS_REF_NUMBERS);
-
- hash = block_hash((byte *) ref_numbers, len * sizeof(Uint32), 0x08d12e65);
- return (int) (hash % ((Uint32) TIMER_HASH_VEC_SZ));
-}
-
-static Eterm
-create_ref(Uint *hp, Uint32 *ref_numbers, Uint32 len)
-{
- Uint32 *datap;
- int i;
-
-
- if (len > ERTS_MAX_REF_NUMBERS) {
- /* Such large refs should no be able to appear in the emulator */
- erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
- }
-
-#if defined(ARCH_64) && !HALFWORD_HEAP
- hp[0] = make_ref_thing_header(len/2 + 1);
- datap = (Uint32 *) &hp[1];
- *(datap++) = len;
-#else
- hp[0] = make_ref_thing_header(len);
- datap = (Uint32 *) &hp[1];
-#endif
-
- for (i = 0; i < len; i++)
- datap[i] = ref_numbers[i];
-
- return make_internal_ref(hp);
-}
-
-static int
-eq_non_standard_ref_numbers(Uint32 *rn1, Uint32 len1, Uint32 *rn2, Uint32 len2)
-{
-#if defined(ARCH_64) && !HALFWORD_HEAP
-#define MAX_REF_HEAP_SZ (1+(ERTS_MAX_REF_NUMBERS/2+1))
-#else
-#define MAX_REF_HEAP_SZ (1+ERTS_MAX_REF_NUMBERS)
-#endif
- DeclareTmpHeapNoproc(r1_hp,(MAX_REF_HEAP_SZ * 2));
- Eterm *r2_hp = r1_hp +MAX_REF_HEAP_SZ;
-
- return eq(create_ref(r1_hp, rn1, len1), create_ref(r2_hp, rn2, len2));
-#undef MAX_REF_HEAP_SZ
-}
-
-static ERTS_INLINE int
-eq_ref_numbers(Uint32 *rn1, Uint32 len1, Uint32 *rn2, Uint32 len2)
-{
- int res;
- if (len1 != ERTS_REF_NUMBERS || len2 != ERTS_REF_NUMBERS) {
- /* Can potentially happen, but will never... */
- return eq_non_standard_ref_numbers(rn1, len1, rn2, len2);
- }
-
-#if ERTS_REF_NUMBERS != 3
-#error "ERTS_REF_NUMBERS changed. Update me..."
-#endif
- res = rn1[0] == rn2[0] && rn1[1] == rn2[1] && rn1[2] == rn2[2];
-
- ASSERT(res
- ? eq_non_standard_ref_numbers(rn1, len1, rn2, len2)
- : !eq_non_standard_ref_numbers(rn1, len1, rn2, len2));
-
- return res;
-}
-
-static ERTS_INLINE ErtsBifTimer *
-tab_find(Eterm ref)
-{
- Uint32 *ref_numbers = internal_ref_numbers(ref);
- Uint32 ref_numbers_len = internal_ref_no_of_numbers(ref);
- int ix = get_index(ref_numbers, ref_numbers_len);
- ErtsBifTimer* btm;
-
- for (btm = bif_timer_tab[ix]; btm; btm = btm->tab.next)
- if (eq_ref_numbers(ref_numbers, ref_numbers_len,
- btm->ref_numbers, ERTS_REF_NUMBERS))
- return btm;
- return NULL;
-}
-
-static ERTS_INLINE void
-tab_remove(ErtsBifTimer* btm)
-{
- if (btm->flags & BTM_FLG_HEAD) {
- *btm->tab.u.head = btm->tab.next;
- if (btm->tab.next) {
- btm->tab.next->flags |= BTM_FLG_HEAD;
- btm->tab.next->tab.u.head = btm->tab.u.head;
- }
- }
- else {
- btm->tab.u.prev->tab.next = btm->tab.next;
- if (btm->tab.next)
- btm->tab.next->tab.u.prev = btm->tab.u.prev;
- }
- btm->flags |= BTM_FLG_CANCELED;
- ASSERT(no_bif_timers > 0);
- no_bif_timers--;
-}
-
-static ERTS_INLINE void
-tab_insert(ErtsBifTimer* btm)
-{
- int ix = get_index(btm->ref_numbers, ERTS_REF_NUMBERS);
- ErtsBifTimer* btm_list = bif_timer_tab[ix];
-
- if (btm_list) {
- btm_list->flags &= ~BTM_FLG_HEAD;
- btm_list->tab.u.prev = btm;
- }
-
- btm->flags |= BTM_FLG_HEAD;
- btm->tab.u.head = &bif_timer_tab[ix];
- btm->tab.next = btm_list;
- bif_timer_tab[ix] = btm;
- no_bif_timers++;
-}
-
-static ERTS_INLINE void
-link_proc(Process *p, ErtsBifTimer* btm)
-{
- btm->receiver.proc.ess = p;
- btm->receiver.proc.prev = NULL;
- btm->receiver.proc.next = p->u.bif_timers;
- if (p->u.bif_timers)
- p->u.bif_timers->receiver.proc.prev = btm;
- p->u.bif_timers = btm;
-}
-
-static ERTS_INLINE void
-unlink_proc(ErtsBifTimer* btm)
-{
- if (btm->receiver.proc.prev)
- btm->receiver.proc.prev->receiver.proc.next = btm->receiver.proc.next;
- else
- btm->receiver.proc.ess->u.bif_timers = btm->receiver.proc.next;
- if (btm->receiver.proc.next)
- btm->receiver.proc.next->receiver.proc.prev = btm->receiver.proc.prev;
-}
-
-static void
-bif_timer_cleanup(ErtsBifTimer* btm)
-{
- ASSERT(btm);
-
- if (btm->bp)
- free_message_buffer(btm->bp);
-
- if (!btm_pre_free(btm)) {
- if (btm->flags & BTM_FLG_SL_TIMER)
- erts_free(ERTS_ALC_T_SL_BIF_TIMER, (void *) btm);
- else
- erts_free(ERTS_ALC_T_LL_BIF_TIMER, (void *) btm);
- }
-}
-
-static void
-bif_timer_timeout(ErtsBifTimer* btm)
-{
- ASSERT(btm);
-
-
- erts_smp_btm_rwlock();
-
- if (btm->flags & BTM_FLG_CANCELED) {
- /*
- * A concurrent cancel is ongoing. Do not send the timeout message,
- * but cleanup here since the cancel call-back won't be called.
- */
-#ifndef ERTS_SMP
- ASSERT(0);
-#endif
- }
- else {
- ErtsProcLocks rp_locks = 0;
- Process* rp;
-
- tab_remove(btm);
-
- ASSERT(!erts_get_current_process());
-
- if (btm->flags & BTM_FLG_BYNAME)
- rp = erts_whereis_process(NULL, 0, btm->receiver.name, 0, 0);
- else {
- rp = btm->receiver.proc.ess;
- unlink_proc(btm);
- }
-
- if (rp) {
- Eterm message;
- ErlHeapFragment *bp;
-
- bp = btm->bp;
- btm->bp = NULL; /* Prevent cleanup of message buffer... */
-
- if (!(btm->flags & BTM_FLG_WRAP))
- message = btm->message;
- else {
-#if ERTS_REF_NUMBERS != 3
-#error "ERTS_REF_NUMBERS changed. Update me..."
-#endif
- Eterm ref;
- Uint *hp;
- Uint wrap_size = REF_THING_SIZE + 4;
- message = btm->message;
-
- if (!bp) {
- ErlOffHeap *ohp;
- ASSERT(is_immed(message));
- hp = erts_alloc_message_heap(wrap_size,
- &bp,
- &ohp,
- rp,
- &rp_locks);
- } else {
- Eterm old_size = bp->used_size;
- bp = erts_resize_message_buffer(bp, old_size + wrap_size,
- &message, 1);
- hp = &bp->mem[0] + old_size;
- }
-
- write_ref_thing(hp,
- btm->ref_numbers[0],
- btm->ref_numbers[1],
- btm->ref_numbers[2]);
- ref = make_internal_ref(hp);
- hp += REF_THING_SIZE;
- message = TUPLE3(hp, am_timeout, ref, message);
- }
-
- erts_queue_message(rp, &rp_locks, bp, message, NIL
-#ifdef USE_VM_PROBES
- , NIL
-#endif
- );
- erts_smp_proc_unlock(rp, rp_locks);
- }
- }
-
- erts_smp_btm_rwunlock();
-
- bif_timer_cleanup(btm);
-}
-
-static Eterm
-setup_bif_timer(Uint32 xflags,
- Process *c_p,
- Eterm time,
- Eterm receiver,
- Eterm message)
-{
- Process *rp;
- ErtsBifTimer* btm;
- Uint timeout;
- Eterm ref;
- Uint32 *ref_numbers;
-
- if (!term_to_Uint(time, &timeout))
- return THE_NON_VALUE;
-#if defined(ARCH_64) && !HALFWORD_HEAP
- if ((timeout >> 32) != 0)
- return THE_NON_VALUE;
-#endif
- if (is_not_internal_pid(receiver) && is_not_atom(receiver))
- return THE_NON_VALUE;
-
- ref = erts_make_ref(c_p);
-
- if (is_atom(receiver))
- rp = NULL;
- else {
- rp = erts_pid2proc(c_p, ERTS_PROC_LOCK_MAIN,
- receiver, ERTS_PROC_LOCK_MSGQ);
- if (!rp)
- return ref;
- }
-
- if (timeout < ERTS_ALC_MIN_LONG_LIVED_TIME) {
- if (timeout < 1000) {
- btm = btm_pre_alloc();
- if (!btm)
- goto sl_timer_alloc;
- btm->flags = 0;
- }
- else {
- sl_timer_alloc:
- btm = (ErtsBifTimer *) erts_alloc(ERTS_ALC_T_SL_BIF_TIMER,
- sizeof(ErtsBifTimer));
- btm->flags = BTM_FLG_SL_TIMER;
- }
- }
- else {
- btm = (ErtsBifTimer *) erts_alloc(ERTS_ALC_T_LL_BIF_TIMER,
- sizeof(ErtsBifTimer));
- btm->flags = 0;
- }
-
- if (rp) {
- link_proc(rp, btm);
- erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_MSGQ);
- }
- else {
- ASSERT(is_atom(receiver));
- btm->receiver.name = receiver;
- btm->flags |= BTM_FLG_BYNAME;
- }
-
- btm->flags |= xflags;
-
- ref_numbers = internal_ref_numbers(ref);
- ASSERT(internal_ref_no_of_numbers(ref) == 3);
-#if ERTS_REF_NUMBERS != 3
-#error "ERTS_REF_NUMBERS changed. Update me..."
-#endif
- btm->ref_numbers[0] = ref_numbers[0];
- btm->ref_numbers[1] = ref_numbers[1];
- btm->ref_numbers[2] = ref_numbers[2];
-
- ASSERT(eq_ref_numbers(btm->ref_numbers, ERTS_REF_NUMBERS,
- ref_numbers, ERTS_REF_NUMBERS));
-
- if (is_immed(message)) {
- btm->bp = NULL;
- btm->message = message;
- }
- else {
- ErlHeapFragment* bp;
- Eterm* hp;
- Uint size;
-
- size = size_object(message);
- btm->bp = bp = new_message_buffer(size);
- hp = bp->mem;
- btm->message = copy_struct(message, size, &hp, &bp->off_heap);
- }
-
- tab_insert(btm);
- ASSERT(btm == tab_find(ref));
- btm->tm.active = 0; /* MUST be initalized */
- erts_set_timer(&btm->tm,
- (ErlTimeoutProc) bif_timer_timeout,
- (ErlCancelProc) bif_timer_cleanup,
- (void *) btm,
- timeout);
- return ref;
-}
-
-/* send_after(Time, Pid, Message) -> Ref */
-BIF_RETTYPE send_after_3(BIF_ALIST_3)
-{
- Eterm res;
-
- if (erts_smp_safe_btm_rwlock(BIF_P, ERTS_PROC_LOCK_MAIN))
- ERTS_BIF_EXITED(BIF_P);
-
- res = setup_bif_timer(0, BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
-
- erts_smp_btm_rwunlock();
-
- if (is_non_value(res)) {
- BIF_ERROR(BIF_P, BADARG);
- }
- else {
- ASSERT(is_internal_ref(res));
- BIF_RET(res);
- }
-}
-
-/* start_timer(Time, Pid, Message) -> Ref */
-BIF_RETTYPE start_timer_3(BIF_ALIST_3)
-{
- Eterm res;
-
- if (erts_smp_safe_btm_rwlock(BIF_P, ERTS_PROC_LOCK_MAIN))
- ERTS_BIF_EXITED(BIF_P);
-
- res = setup_bif_timer(BTM_FLG_WRAP, BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);
-
- erts_smp_btm_rwunlock();
-
- if (is_non_value(res)) {
- BIF_ERROR(BIF_P, BADARG);
- }
- else {
- ASSERT(is_internal_ref(res));
- BIF_RET(res);
- }
-}
-
-/* cancel_timer(Ref) -> false | RemainingTime */
-BIF_RETTYPE cancel_timer_1(BIF_ALIST_1)
-{
- Eterm res;
- ErtsBifTimer *btm;
-
- if (is_not_internal_ref(BIF_ARG_1)) {
- if (is_ref(BIF_ARG_1)) {
- BIF_RET(am_false);
- }
- BIF_ERROR(BIF_P, BADARG);
- }
-
- if (erts_smp_safe_btm_rwlock(BIF_P, ERTS_PROC_LOCK_MAIN))
- ERTS_BIF_EXITED(BIF_P);
-
- btm = tab_find(BIF_ARG_1);
- if (!btm || btm->flags & BTM_FLG_CANCELED) {
- erts_smp_btm_rwunlock();
- res = am_false;
- }
- else {
- Uint left = erts_time_left(&btm->tm);
- if (!(btm->flags & BTM_FLG_BYNAME)) {
- erts_smp_proc_lock(btm->receiver.proc.ess, ERTS_PROC_LOCK_MSGQ);
- unlink_proc(btm);
- erts_smp_proc_unlock(btm->receiver.proc.ess, ERTS_PROC_LOCK_MSGQ);
- }
- tab_remove(btm);
- ASSERT(!tab_find(BIF_ARG_1));
- erts_cancel_timer(&btm->tm);
- erts_smp_btm_rwunlock();
- res = erts_make_integer(left, BIF_P);
- }
-
- BIF_RET(res);
-}
-
-/* read_timer(Ref) -> false | RemainingTime */
-BIF_RETTYPE read_timer_1(BIF_ALIST_1)
-{
- Eterm res;
- ErtsBifTimer *btm;
-
- if (is_not_internal_ref(BIF_ARG_1)) {
- if (is_ref(BIF_ARG_1)) {
- BIF_RET(am_false);
- }
- BIF_ERROR(BIF_P, BADARG);
- }
-
- if (erts_smp_safe_btm_rlock(BIF_P, ERTS_PROC_LOCK_MAIN))
- ERTS_BIF_EXITED(BIF_P);
-
- btm = tab_find(BIF_ARG_1);
- if (!btm || btm->flags & BTM_FLG_CANCELED) {
- res = am_false;
- }
- else {
- Uint left = erts_time_left(&btm->tm);
- res = erts_make_integer(left, BIF_P);
- }
-
- erts_smp_btm_runlock();
-
- BIF_RET(res);
-}
-
-void
-erts_print_bif_timer_info(int to, void *to_arg)
-{
- int i;
- int lock = !ERTS_IS_CRASH_DUMPING;
-
- if (lock)
- erts_smp_btm_rlock();
-
- for (i = 0; i < TIMER_HASH_VEC_SZ; i++) {
- ErtsBifTimer *btm;
- for (btm = bif_timer_tab[i]; btm; btm = btm->tab.next) {
- Eterm receiver = (btm->flags & BTM_FLG_BYNAME
- ? btm->receiver.name
- : btm->receiver.proc.ess->common.id);
- erts_print(to, to_arg, "=timer:%T\n", receiver);
- erts_print(to, to_arg, "Message: %T\n", btm->message);
- erts_print(to, to_arg, "Time left: %u\n",
- erts_time_left(&btm->tm));
- }
- }
-
- if (lock)
- erts_smp_btm_runlock();
-}
-
-
-void
-erts_cancel_bif_timers(Process *p, ErtsProcLocks plocks)
-{
- ErtsBifTimer *btm;
-
- if (erts_smp_btm_tryrwlock() == EBUSY) {
- erts_smp_proc_unlock(p, plocks);
- erts_smp_btm_rwlock();
- erts_smp_proc_lock(p, plocks);
- }
-
- btm = p->u.bif_timers;
- while (btm) {
- ErtsBifTimer *tmp_btm;
- ASSERT(!(btm->flags & BTM_FLG_CANCELED));
- tab_remove(btm);
- tmp_btm = btm;
- btm = btm->receiver.proc.next;
- erts_cancel_timer(&tmp_btm->tm);
- }
-
- p->u.bif_timers = NULL;
-
- erts_smp_btm_rwunlock();
-}
-
-void erts_bif_timer_init(void)
-{
- int i;
- no_bif_timers = 0;
- init_btm_pre_alloc();
- erts_smp_btm_lock_init();
- bif_timer_tab = erts_alloc(ERTS_ALC_T_BIF_TIMER_TABLE,
- sizeof(ErtsBifTimer *)*TIMER_HASH_VEC_SZ);
- for (i = 0; i < TIMER_HASH_VEC_SZ; ++i)
- bif_timer_tab[i] = NULL;
-}
-
-Uint
-erts_bif_timer_memory_size(void)
-{
- Uint res;
- int lock = !ERTS_IS_CRASH_DUMPING;
-
- if (lock)
- erts_smp_btm_rlock();
-
- res = (sizeof(ErtsBifTimer *)*TIMER_HASH_VEC_SZ
- + no_bif_timers*sizeof(ErtsBifTimer));
-
- if (lock)
- erts_smp_btm_runlock();
-
- return res;
-}
-
-
-void
-erts_bif_timer_foreach(void (*func)(Eterm, Eterm, ErlHeapFragment *, void *),
- void *arg)
-{
- int i;
-
- ERTS_SMP_LC_ASSERT(erts_smp_thr_progress_is_blocking());
-
- for (i = 0; i < TIMER_HASH_VEC_SZ; i++) {
- ErtsBifTimer *btm;
- for (btm = bif_timer_tab[i]; btm; btm = btm->tab.next) {
- (*func)((btm->flags & BTM_FLG_BYNAME
- ? btm->receiver.name
- : btm->receiver.proc.ess->common.id),
- btm->message,
- btm->bp,
- arg);
- }
- }
-}