Function enable_timeout

src/backend/utils/misc/timeout.c:156–194

* Enable the specified timeout reason */

 * Enable the specified timeout reason
 */
static void
enable_timeout(TimeoutId id, TimestampTz now, TimestampTz fin_time)
{
	int			i;

	/* Assert request is sane */
	Assert(all_timeouts_initialized);
	Assert(all_timeouts[id].timeout_handler != NULL);

	/*
	 * If this timeout was already active, momentarily disable it.  We
	 * interpret the call as a directive to reschedule the timeout.
	 */
	if (all_timeouts[id].active)
		remove_timeout_index(find_active_timeout(id));

	/*
	 * Find out the index where to insert the new timeout.  We sort by
	 * fin_time, and for equal fin_time by priority.
	 */
	for (i = 0; i < num_active_timeouts; i++)
	{
		timeout_params *old_timeout = active_timeouts[i];

		if (fin_time < old_timeout->fin_time)
			break;
		if (fin_time == old_timeout->fin_time && id < old_timeout->index)
			break;
	}

	/*
	 * Mark the timeout active, and insert it into the active list.
	 */
	all_timeouts[id].indicator = false;
	all_timeouts[id].start_time = now;
	all_timeouts[id].fin_time = fin_time;

	insert_timeout(id, i);
}

/*
 * Schedule alarm for the next active timeout, if any