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fix a few rare race conditions that could lead to a lockup

This commit is contained in:
Anthony Minessale 2013-03-13 16:10:36 -05:00
parent 93bb5ca5c7
commit 77ee3fe10c
2 changed files with 34 additions and 1 deletions
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23
src/switch_core_sqldb.c
View File

@ -1250,6 +1250,7 @@ struct switch_sql_queue_manager {
int thread_running;
switch_thread_cond_t *cond;
switch_mutex_t *cond_mutex;
switch_mutex_t *cond2_mutex;
switch_mutex_t *mutex;
char *pre_trans_execute;
char *post_trans_execute;
@ -1262,10 +1263,26 @@ struct switch_sql_queue_manager {
static int qm_wake(switch_sql_queue_manager_t *qm)
{
if (switch_mutex_trylock(qm->cond_mutex) == SWITCH_STATUS_SUCCESS) {
switch_status_t status;
int tries = 0;
top:
status = switch_mutex_trylock(qm->cond_mutex);
if (status == SWITCH_STATUS_SUCCESS) {
switch_thread_cond_signal(qm->cond);
switch_mutex_unlock(qm->cond_mutex);
return 1;
} else {
if (switch_mutex_trylock(qm->cond2_mutex) == SWITCH_STATUS_SUCCESS) {
switch_mutex_unlock(qm->cond2_mutex);
} else {
if (++tries < 10) {
switch_cond_next();
goto top;
}
}
}
return 0;
@ -1407,6 +1424,7 @@ SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_stop(switch_sql_queue_m
if (qm->thread) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "%s Stopping SQL thread.\n", qm->name);
qm_wake(qm);
switch_thread_join(&status, qm->thread);
qm->thread = NULL;
status = SWITCH_STATUS_SUCCESS;
@ -1596,6 +1614,7 @@ SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_init_name(const char *n
qm->max_trans = max_trans;
switch_mutex_init(&qm->cond_mutex, SWITCH_MUTEX_NESTED, qm->pool);
switch_mutex_init(&qm->cond2_mutex, SWITCH_MUTEX_NESTED, qm->pool);
switch_mutex_init(&qm->mutex, SWITCH_MUTEX_NESTED, qm->pool);
switch_thread_cond_create(&qm->cond, qm->pool);
@ -1850,7 +1869,9 @@ static void *SWITCH_THREAD_FUNC switch_user_sql_thread(switch_thread_t *thread,
check:
if ((lc = qm_ttl(qm)) == 0) {
switch_mutex_lock(qm->cond2_mutex);
switch_thread_cond_wait(qm->cond, qm->cond_mutex);
switch_mutex_unlock(qm->cond2_mutex);
}
i = 40;

12
src/switch_scheduler.c
View File

@ -37,6 +37,7 @@ struct switch_scheduler_task_container {
int64_t executed;
int in_thread;
int destroyed;
int running;
switch_scheduler_func_t func;
switch_memory_pool_t *pool;
uint32_t flags;
@ -124,7 +125,11 @@ static int task_thread_loop(int done)
tp->in_thread = 1;
switch_thread_create(&thread, thd_attr, task_own_thread, tp, tp->pool);
} else {
tp->running = 1;
switch_mutex_unlock(globals.task_mutex);
switch_scheduler_execute(tp);
switch_mutex_lock(globals.task_mutex);
tp->running = 0;
}
}
}
@ -238,6 +243,13 @@ SWITCH_DECLARE(uint32_t) switch_scheduler_del_task_id(uint32_t task_id)
tp->task.task_id, tp->task.group);
break;
}
if (tp->running) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "Attempt made to delete running task #%u (group %s)\n",
tp->task.task_id, tp->task.group);
break;
}
tp->destroyed++;
if (switch_event_create(&event, SWITCH_EVENT_DEL_SCHEDULE) == SWITCH_STATUS_SUCCESS) {
switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Task-ID", "%u", tp->task.task_id);