system/kernel/timer.cpp

72 add_event_to_list(timer* event, timer* volatile* list)
77 	// stick it in the event list
79 		if ((bigtime_t)next->schedule_time >= (bigtime_t)event->schedule_time)
84 		event->next = last->next;
85 		last->next = event;
87 		event->next = next;
88 		*list = event;
111 	while (timer* event = *it) {
113 		uint32 flags = event->flags;
116 			it = &event->next;
122 		*it = event->next;
123 		event->next = affectedTimers;
124 		affectedTimers = event;
132 		timer* event = affectedTimers;
133 		affectedTimers = event->next;
135 		bigtime_t oldTime = event->schedule_time;
136 		event->schedule_time += timeDiff;
140 			if (event->schedule_time < oldTime)
141 				event->schedule_time = B_INFINITE_TIMEOUT;
143 			if (event->schedule_time < 0)
144 				event->schedule_time = 0;
147 		add_event_to_list(event, &cpuData.events);
152 	// If the first event has changed, reset the hardware timer.
173 		for (timer* event = sPerCPU[i].events; event != NULL;
174 				event = event->next) {
175 			kprintf("  [%9lld] %p: ", (long long)event->schedule_time, event);
176 			if ((event->flags & ~B_TIMER_FLAGS) == B_PERIODIC_TIMER)
177 				kprintf("periodic %9lld, ", (long long)event->period);
182 				event->flags, event->user_data, event->hook);
190 				(addr_t)event->hook, NULL, &symbol, &imageName, &exactMatch);
248 	timer* event;
260 	event = cpuData.events;
261 	while (event != NULL && ((bigtime_t)event->schedule_time < system_time())) {
262 		// this event needs to happen
263 		int mode = event->flags;
265 		cpuData.events = (timer*)event->next;
266 		cpuData.current_event = event;
271 		TRACE(("timer_interrupt: calling hook %p for event %p\n", event->hook,
272 			event));
275 		// note: if the event is not periodic, it is ok
276 		// to delete the event structure inside the callback
277 		if (event->hook)
278 			rc = event->hook(event);
287 			event->schedule_time += event->period;
292 			if (now >= event->schedule_time + event->period) {
294 				event->schedule_time = now
295 					- (now - event->schedule_time) % event->period;
298 			add_event_to_list(event, &cpuData.events);
303 		event = cpuData.events;
320 add_timer(timer* event, timer_hook hook, bigtime_t period, int32 flags)
325 	if (event == NULL || hook == NULL || period < 0)
328 	TRACE(("add_timer: event %p\n", event));
333 		scheduleTime = event->schedule_time;
334 		period = event->period;
339 		event->schedule_time = (int64)scheduleTime;
340 		event->period = period;
343 	event->hook = hook;
344 	event->flags = flags;
355 		if (event->schedule_time > cpuData.real_time_offset)
356 			event->schedule_time -= cpuData.real_time_offset;
358 			event->schedule_time = 0;
361 	add_event_to_list(event, &cpuData.events);
362 	event->cpu = currentCPU;
365 	if (event == cpuData.events)
376 cancel_timer(timer* event)
378 	TRACE(("cancel_timer: event %p\n", event));
383 	int cpu = event->cpu;
390 		if (cpu == event->cpu)
395 		cpu = event->cpu;
400 	if (event != cpuData.current_event) {
406 			if (current == event) {
426 		event->cpu = 0xffff;
440 	// event so that timer_interrupt() will not reschedule periodic timers.
444 	// lock to be held while calling the event hook, we'll have to wait