Function timer_enable

src/pcem/timer.cpp:12–64

static pc_timer_t *timer_head = NULL;

void timer_enable(pc_timer_t *timer)
{
	pc_timer_t *timer_node = timer_head;

//	pclog("timer->enable %p %i\n", timer, timer->enabled);
	if (timer->enabled)
		timer_disable(timer);

	if (timer->next || timer->prev)
		fatal("timer_enable - timer->next\n");

	timer->enabled = 1;

	/*List currently empty - add to head*/
	if (!timer_head)
	{
		timer_head = timer;
		timer->next = timer->prev = NULL;
        	timer_target = timer_head->ts_integer;
		return;
	}

	timer_node = timer_head;

	while (1)
	{
		/*Timer expires before timer_node. Add to list in front of timer_node*/
		if (TIMER_LESS_THAN(timer, timer_node))
		{
			timer->next = timer_node;
			timer->prev = timer_node->prev;
			timer_node->prev = timer;
			if (timer->prev)
				timer->prev->next = timer;
			else
			{
				timer_head = timer;
				timer_target = timer_head->ts_integer;
                        }
			return;
		}

		/*timer_node is last in the list. Add timer to end of list*/
		if (!timer_node->next)
		{
			timer_node->next = timer;
			timer->prev = timer_node;
			return;
		}

		timer_node = timer_node->next;
	}
}
void timer_disable(pc_timer_t *timer)
{
//	pclog("timer->disable %p\n", timer);