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back off locking contention on sql queues when they are nearly full to allow the system to recover from an attack

This commit is contained in:
Anthony Minessale 2014-05-23 23:13:38 +05:00
parent af4380d938
commit 042b162bc4
1 changed files with 16 additions and 3 deletions
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19
src/switch_core_sqldb.c
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@ -1699,6 +1699,9 @@ SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_destroy(switch_sql_queu
SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_push(switch_sql_queue_manager_t *qm, const char *sql, uint32_t pos, switch_bool_t dup) SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_push(switch_sql_queue_manager_t *qm, const char *sql, uint32_t pos, switch_bool_t dup)
{ {
char *sqlptr = NULL;
switch_status_t status;
int x = 0;
if (sql_manager.paused || qm->thread_running != 1) { if (sql_manager.paused || qm->thread_running != 1) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG1, "DROP [%s]\n", sql); switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG1, "DROP [%s]\n", sql);
@ -1716,9 +1719,19 @@ SWITCH_DECLARE(switch_status_t) switch_sql_queue_manager_push(switch_sql_queue_m
pos = 0; pos = 0;
} }
switch_mutex_lock(qm->mutex); sqlptr = dup ? strdup(sql) : (char *)sql;
switch_queue_push(qm->sql_queue[pos], dup ? strdup(sql) : (char *)sql);
switch_mutex_unlock(qm->mutex); do {
switch_mutex_lock(qm->mutex);
status = switch_queue_trypush(qm->sql_queue[pos], sqlptr);
switch_mutex_unlock(qm->mutex);
if (status != SWITCH_STATUS_SUCCESS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG1, "Delay %d sending sql\n", x);
if (x++) {
switch_yield(1000000 * x);
}
}
} while(status != SWITCH_STATUS_SUCCESS);
qm_wake(qm); qm_wake(qm);