Example #1
0
/*!
 * \internal
 * \brief astdb sync thread
 *
 * This thread is in charge of syncing astdb to disk after a change.
 * By pushing it off to this thread to take care of, this I/O bound operation
 * will not block other threads from performing other critical processing.
 * If changes happen rapidly, this thread will also ensure that the sync
 * operations are rate limited.
 */
static void *db_sync_thread(void *data)
{
	ast_mutex_lock(&dblock);
	ast_db_begin_transaction();
	for (;;) {
		/* We're ok with spurious wakeups, so we don't worry about a predicate */
		ast_cond_wait(&dbcond, &dblock);
		if (ast_db_commit_transaction()) {
			ast_db_rollback_transaction();
		}
		if (doexit) {
			ast_mutex_unlock(&dblock);
			break;
		}
		ast_db_begin_transaction();
		ast_mutex_unlock(&dblock);
		sleep(1);
		ast_mutex_lock(&dblock);
		/* Unfortunately, it is possible for signaling to happen
		 * when we're not waiting: in the bit when we're unlocked
		 * above. Do the do-exit check here again. (We could do
		 * it once, but that would impose a forced delay of 1
		 * second always.) */
		if (doexit) {
			ast_mutex_unlock(&dblock);
			break;
		}
	}

	return NULL;
}
Example #2
0
File: db.c Project: pruiz/asterisk
/*!
 * \internal
 * \brief astdb sync thread
 *
 * This thread is in charge of syncing astdb to disk after a change.
 * By pushing it off to this thread to take care of, this I/O bound operation
 * will not block other threads from performing other critical processing.
 * If changes happen rapidly, this thread will also ensure that the sync
 * operations are rate limited.
 */
static void *db_sync_thread(void *data)
{
	ast_mutex_lock(&dblock);
	ast_db_begin_transaction();
	for (;;) {
		/* If dosync is set, db_sync() was called during sleep(1), 
		 * and the pending transaction should be committed. 
		 * Otherwise, block until db_sync() is called.
		 */
		while (!dosync) {
			ast_cond_wait(&dbcond, &dblock);
		}
		dosync = 0;
		if (ast_db_commit_transaction()) {
			ast_db_rollback_transaction();
		}
		if (doexit) {
			ast_mutex_unlock(&dblock);
			break;
		}
		ast_db_begin_transaction();
		ast_mutex_unlock(&dblock);
		sleep(1);
		ast_mutex_lock(&dblock);
	}

	return NULL;
}