gistfile1.txt

dispatch_source_t dispatch_coalesce_source_create(dispatch_queue_t queue)
{
    dispatch_source_t src = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
	dispatch_resume(src);
	return src;
}

void dispatch_coalesce(dispatch_source_t src, double time, void (^block)(void))
{
	dispatch_source_set_timer(src, dispatch_time(DISPATCH_TIME_NOW, time * NSEC_PER_SEC), DISPATCH_TIME_FOREVER, 0);
	dispatch_source_set_event_handler(src, ^{
		block();
	});
}