static void
release_update_permission(int release_updater)
{
erts_mtx_lock(&update_table_permission_mtx);
ASSERT(updater_process != NULL);
if (release_updater) {
erts_proc_lock(updater_process, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(updater_process)) {
erts_resume(updater_process, ERTS_PROC_LOCK_STATUS);
}
erts_proc_unlock(updater_process, ERTS_PROC_LOCK_STATUS);
}
updater_process = NULL;
while (update_queue != NULL) { /* Unleash the entire herd */
struct update_queue_item* qitem = update_queue;
erts_proc_lock(qitem->p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(qitem->p)) {
erts_resume(qitem->p, ERTS_PROC_LOCK_STATUS);
}
erts_proc_unlock(qitem->p, ERTS_PROC_LOCK_STATUS);
update_queue = qitem->next;
erts_proc_dec_refc(qitem->p);
erts_free(ERTS_ALC_T_PERSISTENT_LOCK_Q, qitem);
}
erts_mtx_unlock(&update_table_permission_mtx);
}
static void
reply_msacc(void *vmsaccrp)
{
ErtsMsAcc *msacc = ERTS_MSACC_TSD_GET();
ErtsMSAccReq *msaccrp = (ErtsMSAccReq *) vmsaccrp;
ASSERT(!msacc || !msacc->unmanaged);
if (msaccrp->action == ERTS_MSACC_ENABLE && !msacc) {
msacc = get_msacc();
msacc->perf_counter = erts_sys_perf_counter();
msacc->state = ERTS_MSACC_STATE_OTHER;
ERTS_MSACC_TSD_SET(msacc);
} else if (msaccrp->action == ERTS_MSACC_DISABLE && msacc) {
ERTS_MSACC_TSD_SET(NULL);
} else if (msaccrp->action == ERTS_MSACC_RESET) {
msacc = msacc ? msacc : get_msacc();
erts_msacc_reset(msacc);
} else if (msaccrp->action == ERTS_MSACC_GATHER && !msacc) {
msacc = get_msacc();
}
ASSERT(!msacc || !msacc->unmanaged);
send_reply(msacc, msaccrp);
erts_proc_dec_refc(msaccrp->proc);
if (erts_smp_atomic32_dec_read_nob(&msaccrp->refc) == 0)
erts_free(ERTS_ALC_T_MSACC, vmsaccrp);
}
static void
process_killer(void)
{
int i, j, max = erts_ptab_max(&erts_proc);
Process* rp;
erts_printf("\n\nProcess Information\n\n");
erts_printf("--------------------------------------------------\n");
for (i = max-1; i >= 0; i--) {
rp = erts_pix2proc(i);
if (rp && rp->i != ENULL) {
int br;
print_process_info(ERTS_PRINT_STDOUT, NULL, rp);
erts_printf("(k)ill (n)ext (r)eturn:\n");
while(1) {
if ((j = sys_get_key(0)) <= 0)
erts_exit(0, "");
switch(j) {
case 'k': {
ErtsProcLocks rp_locks = ERTS_PROC_LOCKS_XSIG_SEND;
erts_aint32_t state;
erts_proc_inc_refc(rp);
erts_smp_proc_lock(rp, rp_locks);
state = erts_smp_atomic32_read_acqb(&rp->state);
if (state & (ERTS_PSFLG_FREE
| ERTS_PSFLG_EXITING
| ERTS_PSFLG_ACTIVE
| ERTS_PSFLG_ACTIVE_SYS
| ERTS_PSFLG_IN_RUNQ
| ERTS_PSFLG_RUNNING
| ERTS_PSFLG_RUNNING_SYS
| ERTS_PSFLG_DIRTY_RUNNING
| ERTS_PSFLG_DIRTY_RUNNING_SYS)) {
erts_printf("Can only kill WAITING processes this way\n");
}
else {
(void) erts_send_exit_signal(NULL,
NIL,
rp,
&rp_locks,
am_kill,
NIL,
NULL,
0);
}
erts_smp_proc_unlock(rp, rp_locks);
erts_proc_dec_refc(rp);
}
case 'n': br = 1; break;
case 'r': return;
default: return;
}
if (br == 1) break;
}
}
}
}
static void copy_literals_commit(void* null) {
Process* p = committer_state.stager;
#ifdef DEBUG
committer_state.stager = NULL;
#endif
erts_release_code_write_permission();
erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(p)) {
erts_resume(p, ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS);
erts_proc_dec_refc(p);
}
static void
thr_prg_wake_up_later(void* bin_p)
{
Binary* bin = bin_p;
ErtsFlxCtrWakeUpLaterInfo* info = ERTS_MAGIC_BIN_DATA(bin);
Process* p = info->process;
/* Resume the requesting process */
erts_proc_lock(p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(p)) {
erts_resume(p, ERTS_PROC_LOCK_STATUS);
}
erts_proc_unlock(p, ERTS_PROC_LOCK_STATUS);
/* Free data */
erts_proc_dec_refc(p);
erts_bin_release(bin);
}
static void
thr_prg_wake_up_and_count(void* bin_p)
{
Binary* bin = bin_p;
DecentralizedReadSnapshotInfo* info = ERTS_MAGIC_BIN_DATA(bin);
Process* p = info->process;
ErtsFlxCtrDecentralizedCtrArray* array = info->array;
ErtsFlxCtrDecentralizedCtrArray* next = info->next_array;
int i, sched;
/* Reset result array */
for (i = 0; i < info->nr_of_counters; i++) {
info->result[i] = 0;
}
/* Read result from snapshot */
for (sched = 0; sched < ERTS_FLXCTR_DECENTRALIZED_NO_SLOTS; sched++) {
for (i = 0; i < info->nr_of_counters; i++) {
info->result[i] = info->result[i] +
erts_atomic_read_nob(&array->array[sched].counters[i]);
}
}
/* Update the next decentralized counter array */
for (i = 0; i < info->nr_of_counters; i++) {
erts_atomic_add_nob(&next->array[0].counters[i], info->result[i]);
}
/* Announce that the snapshot is done */
{
Sint expected = ERTS_FLXCTR_SNAPSHOT_ONGOING;
if (expected != erts_atomic_cmpxchg_mb(&next->snapshot_status,
ERTS_FLXCTR_SNAPSHOT_NOT_ONGOING,
expected)) {
/* The CAS failed which means that this thread need to free the next array. */
erts_free(info->alloc_type, next->block_start);
}
}
/* Resume the process that requested the snapshot */
erts_proc_lock(p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(p)) {
erts_resume(p, ERTS_PROC_LOCK_STATUS);
}
/* Free the memory that is no longer needed */
erts_free(info->alloc_type, array->block_start);
erts_proc_unlock(p, ERTS_PROC_LOCK_STATUS);
erts_proc_dec_refc(p);
erts_bin_release(bin);
}
static void signal_notify_requested(Eterm type) {
Process* p = NULL;
Eterm msg, *hp;
ErtsProcLocks locks = 0;
ErlOffHeap *ohp;
Eterm id = erts_whereis_name_to_id(NULL, am_erl_signal_server);
if ((p = (erts_pid2proc_opt(NULL, 0, id, 0, ERTS_P2P_FLG_INC_REFC))) != NULL) {
ErtsMessage *msgp = erts_alloc_message_heap(p, &locks, 3, &hp, &ohp);
/* erl_signal_server ! {notify, sighup} */
msg = TUPLE2(hp, am_notify, type);
erts_queue_message(p, locks, msgp, msg, am_system);
if (locks)
erts_smp_proc_unlock(p, locks);
erts_proc_dec_refc(p);
}
}
static int
dirty_send_message(Process *c_p, Eterm to, Eterm tag)
{
ErtsProcLocks c_p_locks, rp_locks;
Process *rp, *real_c_p;
Eterm msg, *hp;
ErlOffHeap *ohp;
ErtsMessage *mp;
ASSERT(is_immed(tag));
real_c_p = erts_proc_shadow2real(c_p);
if (real_c_p != c_p)
c_p_locks = 0;
else
c_p_locks = ERTS_PROC_LOCK_MAIN;
ASSERT(real_c_p->common.id == c_p->common.id);
rp = erts_pid2proc_opt(real_c_p, c_p_locks,
to, 0,
ERTS_P2P_FLG_INC_REFC);
if (!rp)
return 0;
rp_locks = 0;
mp = erts_alloc_message_heap(rp, &rp_locks, 3, &hp, &ohp);
msg = TUPLE2(hp, tag, c_p->common.id);
erts_queue_message(rp, rp_locks, mp, msg, c_p->common.id);
if (rp == real_c_p)
rp_locks &= ~c_p_locks;
if (rp_locks)
erts_proc_unlock(rp, rp_locks);
erts_proc_dec_refc(rp);
return 1;
}
void erts_release_code_write_permission(void)
{
erts_smp_mtx_lock(&code_write_permission_mtx);
ERTS_SMP_LC_ASSERT(erts_has_code_write_permission());
while (code_write_queue != NULL) { /* unleash the entire herd */
struct code_write_queue_item* qitem = code_write_queue;
erts_smp_proc_lock(qitem->p, ERTS_PROC_LOCK_STATUS);
if (!ERTS_PROC_IS_EXITING(qitem->p)) {
erts_resume(qitem->p, ERTS_PROC_LOCK_STATUS);
}
erts_smp_proc_unlock(qitem->p, ERTS_PROC_LOCK_STATUS);
code_write_queue = qitem->next;
erts_proc_dec_refc(qitem->p);
erts_free(ERTS_ALC_T_CODE_IX_LOCK_Q, qitem);
}
code_writing_process = NULL;
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_tsd_set(has_code_write_permission, (void *) 0);
#endif
erts_smp_mtx_unlock(&code_write_permission_mtx);
}
Process *
erts_pid2proc_opt(Process *c_p,
ErtsProcLocks c_p_have_locks,
Eterm pid,
ErtsProcLocks pid_need_locks,
int flags)
{
Process *dec_refc_proc = NULL;
ErtsThrPrgrDelayHandle dhndl;
ErtsProcLocks need_locks;
Uint pix;
Process *proc;
#if ERTS_PROC_LOCK_OWN_IMPL && defined(ERTS_ENABLE_LOCK_COUNT)
ErtsProcLocks lcnt_locks;
#endif
#ifdef ERTS_ENABLE_LOCK_CHECK
if (c_p) {
ErtsProcLocks might_unlock = c_p_have_locks & pid_need_locks;
if (might_unlock)
erts_proc_lc_might_unlock(c_p, might_unlock);
}
#endif
if (is_not_internal_pid(pid))
return NULL;
pix = internal_pid_index(pid);
ERTS_LC_ASSERT((pid_need_locks & ERTS_PROC_LOCKS_ALL) == pid_need_locks);
need_locks = pid_need_locks;
if (c_p && c_p->common.id == pid) {
ASSERT(c_p->common.id != ERTS_INVALID_PID);
ASSERT(c_p == erts_pix2proc(pix));
if (!(flags & ERTS_P2P_FLG_ALLOW_OTHER_X)
&& ERTS_PROC_IS_EXITING(c_p))
return NULL;
need_locks &= ~c_p_have_locks;
if (!need_locks) {
if (flags & ERTS_P2P_FLG_INC_REFC)
erts_proc_inc_refc(c_p);
return c_p;
}
}
dhndl = erts_thr_progress_unmanaged_delay();
proc = (Process *) erts_ptab_pix2intptr_ddrb(&erts_proc, pix);
if (proc) {
if (proc->common.id != pid)
proc = NULL;
else if (!need_locks) {
if (flags & ERTS_P2P_FLG_INC_REFC)
erts_proc_inc_refc(proc);
}
else {
int busy;
#if ERTS_PROC_LOCK_OWN_IMPL
#ifdef ERTS_ENABLE_LOCK_COUNT
lcnt_locks = need_locks;
if (!(flags & ERTS_P2P_FLG_TRY_LOCK)) {
erts_lcnt_proc_lock(&proc->lock, need_locks);
}
#endif
#ifdef ERTS_ENABLE_LOCK_CHECK
/* Make sure erts_pid2proc_safelock() is enough to handle
a potential lock order violation situation... */
busy = erts_proc_lc_trylock_force_busy(proc, need_locks);
if (!busy)
#endif
#endif /* ERTS_PROC_LOCK_OWN_IMPL */
{
/* Try a quick trylock to grab all the locks we need. */
busy = (int) erts_smp_proc_raw_trylock__(proc, need_locks);
#if ERTS_PROC_LOCK_OWN_IMPL && defined(ERTS_ENABLE_LOCK_CHECK)
erts_proc_lc_trylock(proc, need_locks, !busy, __FILE__,__LINE__);
#endif
#ifdef ERTS_PROC_LOCK_DEBUG
if (!busy)
erts_proc_lock_op_debug(proc, need_locks, 1);
#endif
}
#if ERTS_PROC_LOCK_OWN_IMPL && defined(ERTS_ENABLE_LOCK_COUNT)
if (flags & ERTS_P2P_FLG_TRY_LOCK)
erts_lcnt_proc_trylock(&proc->lock, need_locks,
busy ? EBUSY : 0);
#endif
if (!busy) {
if (flags & ERTS_P2P_FLG_INC_REFC)
erts_proc_inc_refc(proc);
#if ERTS_PROC_LOCK_OWN_IMPL && defined(ERTS_ENABLE_LOCK_COUNT)
/* all is great */
if (!(flags & ERTS_P2P_FLG_TRY_LOCK))
erts_lcnt_proc_lock_post_x(&proc->lock, lcnt_locks,
__FILE__, __LINE__);
#endif
}
else {
if (flags & ERTS_P2P_FLG_TRY_LOCK)
proc = ERTS_PROC_LOCK_BUSY;
else {
int managed;
if (flags & ERTS_P2P_FLG_INC_REFC)
erts_proc_inc_refc(proc);
#if ERTS_PROC_LOCK_OWN_IMPL && defined(ERTS_ENABLE_LOCK_COUNT)
erts_lcnt_proc_lock_unaquire(&proc->lock, lcnt_locks);
#endif
managed = dhndl == ERTS_THR_PRGR_DHANDLE_MANAGED;
if (!managed) {
erts_proc_inc_refc(proc);
erts_thr_progress_unmanaged_continue(dhndl);
dec_refc_proc = proc;
/*
* We don't want to call
* erts_thr_progress_unmanaged_continue()
* again.
*/
dhndl = ERTS_THR_PRGR_DHANDLE_MANAGED;
}
proc_safelock(managed,
c_p,
c_p_have_locks,
c_p_have_locks,
proc,
0,
need_locks);
}
}
}
}
if (dhndl != ERTS_THR_PRGR_DHANDLE_MANAGED)
erts_thr_progress_unmanaged_continue(dhndl);
if (need_locks
&& proc
&& proc != ERTS_PROC_LOCK_BUSY
&& (!(flags & ERTS_P2P_FLG_ALLOW_OTHER_X)
? ERTS_PROC_IS_EXITING(proc)
: (proc
!= (Process *) erts_ptab_pix2intptr_nob(&erts_proc, pix)))) {
erts_smp_proc_unlock(proc, need_locks);
if (flags & ERTS_P2P_FLG_INC_REFC)
dec_refc_proc = proc;
proc = NULL;
}
if (dec_refc_proc)
erts_proc_dec_refc(dec_refc_proc);
#if ERTS_PROC_LOCK_OWN_IMPL && defined(ERTS_PROC_LOCK_DEBUG)
ERTS_LC_ASSERT(!proc
|| proc == ERTS_PROC_LOCK_BUSY
|| (pid_need_locks ==
(ERTS_PROC_LOCK_FLGS_READ_(&proc->lock)
& pid_need_locks)));
#endif
return proc;
}
static void
proc_safelock(int is_managed,
Process *a_proc,
ErtsProcLocks a_have_locks,
ErtsProcLocks a_need_locks,
Process *b_proc,
ErtsProcLocks b_have_locks,
ErtsProcLocks b_need_locks)
{
Process *p1, *p2;
#ifdef ERTS_ENABLE_LOCK_CHECK
Eterm pid1, pid2;
#endif
ErtsProcLocks need_locks1, have_locks1, need_locks2, have_locks2;
ErtsProcLocks unlock_mask;
int lock_no, refc1 = 0, refc2 = 0;
ERTS_LC_ASSERT(b_proc);
/* Determine inter process lock order...
* Locks with the same lock order should be locked on p1 before p2.
*/
if (a_proc) {
if (a_proc->common.id < b_proc->common.id) {
p1 = a_proc;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid1 = a_proc->common.id;
#endif
need_locks1 = a_need_locks;
have_locks1 = a_have_locks;
p2 = b_proc;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid2 = b_proc->common.id;
#endif
need_locks2 = b_need_locks;
have_locks2 = b_have_locks;
}
else if (a_proc->common.id > b_proc->common.id) {
p1 = b_proc;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid1 = b_proc->common.id;
#endif
need_locks1 = b_need_locks;
have_locks1 = b_have_locks;
p2 = a_proc;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid2 = a_proc->common.id;
#endif
need_locks2 = a_need_locks;
have_locks2 = a_have_locks;
}
else {
ERTS_LC_ASSERT(a_proc == b_proc);
ERTS_LC_ASSERT(a_proc->common.id == b_proc->common.id);
p1 = a_proc;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid1 = a_proc->common.id;
#endif
need_locks1 = a_need_locks | b_need_locks;
have_locks1 = a_have_locks | b_have_locks;
p2 = NULL;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid2 = 0;
#endif
need_locks2 = 0;
have_locks2 = 0;
}
}
else {
p1 = b_proc;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid1 = b_proc->common.id;
#endif
need_locks1 = b_need_locks;
have_locks1 = b_have_locks;
p2 = NULL;
#ifdef ERTS_ENABLE_LOCK_CHECK
pid2 = 0;
#endif
need_locks2 = 0;
have_locks2 = 0;
#ifdef ERTS_ENABLE_LOCK_CHECK
a_need_locks = 0;
a_have_locks = 0;
#endif
}
#ifdef ERTS_ENABLE_LOCK_CHECK
if (p1)
erts_proc_lc_chk_proc_locks(p1, have_locks1);
if (p2)
erts_proc_lc_chk_proc_locks(p2, have_locks2);
if ((need_locks1 & have_locks1) != have_locks1)
erts_lc_fail("Thread tries to release process lock(s) "
"on %T via erts_proc_safelock().", pid1);
if ((need_locks2 & have_locks2) != have_locks2)
erts_lc_fail("Thread tries to release process lock(s) "
"on %T via erts_proc_safelock().",
pid2);
#endif
need_locks1 &= ~have_locks1;
need_locks2 &= ~have_locks2;
/* Figure out the range of locks that needs to be unlocked... */
unlock_mask = ERTS_PROC_LOCKS_ALL;
for (lock_no = 0;
lock_no <= ERTS_PROC_LOCK_MAX_BIT;
lock_no++) {
ErtsProcLocks lock = (1 << lock_no);
if (lock & need_locks1)
break;
unlock_mask &= ~lock;
if (lock & need_locks2)
break;
}
/* ... and unlock locks in that range... */
if (have_locks1 || have_locks2) {
ErtsProcLocks unlock_locks;
unlock_locks = unlock_mask & have_locks1;
if (unlock_locks) {
have_locks1 &= ~unlock_locks;
need_locks1 |= unlock_locks;
if (!is_managed && !have_locks1) {
refc1 = 1;
erts_proc_inc_refc(p1);
}
erts_smp_proc_unlock(p1, unlock_locks);
}
unlock_locks = unlock_mask & have_locks2;
if (unlock_locks) {
have_locks2 &= ~unlock_locks;
need_locks2 |= unlock_locks;
if (!is_managed && !have_locks2) {
refc2 = 1;
erts_proc_inc_refc(p2);
}
erts_smp_proc_unlock(p2, unlock_locks);
}
}
/*
* lock_no equals the number of the first lock to lock on
* either p1 *or* p2.
*/
#ifdef ERTS_ENABLE_LOCK_CHECK
if (p1)
erts_proc_lc_chk_proc_locks(p1, have_locks1);
if (p2)
erts_proc_lc_chk_proc_locks(p2, have_locks2);
#endif
/* Lock locks in lock order... */
while (lock_no <= ERTS_PROC_LOCK_MAX_BIT) {
ErtsProcLocks locks;
ErtsProcLocks lock = (1 << lock_no);
ErtsProcLocks lock_mask = 0;
if (need_locks1 & lock) {
do {
lock = (1 << lock_no++);
lock_mask |= lock;
} while (lock_no <= ERTS_PROC_LOCK_MAX_BIT
&& !(need_locks2 & lock));
if (need_locks2 & lock)
lock_no--;
locks = need_locks1 & lock_mask;
erts_smp_proc_lock(p1, locks);
have_locks1 |= locks;
need_locks1 &= ~locks;
}
else if (need_locks2 & lock) {
while (lock_no <= ERTS_PROC_LOCK_MAX_BIT
&& !(need_locks1 & lock)) {
lock_mask |= lock;
lock = (1 << ++lock_no);
}
locks = need_locks2 & lock_mask;
erts_smp_proc_lock(p2, locks);
have_locks2 |= locks;
need_locks2 &= ~locks;
}
else
lock_no++;
}
#ifdef ERTS_ENABLE_LOCK_CHECK
if (p1)
erts_proc_lc_chk_proc_locks(p1, have_locks1);
if (p2)
erts_proc_lc_chk_proc_locks(p2, have_locks2);
if (p1 && p2) {
if (p1 == a_proc) {
ERTS_LC_ASSERT(a_need_locks == have_locks1);
ERTS_LC_ASSERT(b_need_locks == have_locks2);
}
else {
ERTS_LC_ASSERT(a_need_locks == have_locks2);
ERTS_LC_ASSERT(b_need_locks == have_locks1);
}
}
else {
ERTS_LC_ASSERT(p1);
if (a_proc) {
ERTS_LC_ASSERT(have_locks1 == (a_need_locks | b_need_locks));
}
else {
ERTS_LC_ASSERT(have_locks1 == b_need_locks);
}
}
#endif
if (!is_managed) {
if (refc1)
erts_proc_dec_refc(p1);
if (refc2)
erts_proc_dec_refc(p2);
}
}
