Function Timer_InterruptRun

src/timer.c:89–132

* Run the timer interrupt handler. */

 * Run the timer interrupt handler.
 */
static void Timer_InterruptRun(int arg)
{
	TimerNode *node;
	uint32 new_time, usec_delta, delta;
	int i;

	/* Lock the timer, to avoid double-calls */
	static bool timerLock = false;
	if (timerLock) return;
	timerLock = true;

	/* Calculate the time between calls */
	new_time   = Timer_GetTime();
	usec_delta = (new_time - s_timerLastTime) * 1000;
	s_timerLastTime = new_time;

	/* Walk all our timers, see which (and how often) it should be triggered */
	node = s_timerNodes;
	for (i = 0; i < s_timerNodeCount; i++, node++) {
		delta = usec_delta;

		/* No delay means: as often as possible, but don't worry about it */
		if (node->usec_delay == 0) {
			node->callback();
			continue;
		}

		if (node->callonce) {
			if (node->usec_left <= delta) {
				delta -= node->usec_left;
				node->usec_left = node->usec_delay;
				if(arg == 0) node->callback();
				while (node->usec_left <= delta) delta -= node->usec_left;
			}
		} else while (node->usec_left <= delta) {
			delta -= node->usec_left;
			node->usec_left = node->usec_delay;
			node->callback();
		}
		node->usec_left -= delta;
	}

	timerLock = false;
}

#if defined(TOS) || defined(DOS)
void SleepAndProcessBackgroundTasks(void)