kernel/time/alarmtimer.c

5  * This interface provides a timer which is similar to hrtimers,
8  * This interface is influenced by the Android RTC Alarm timer
37  * struct alarm_base - Alarm timer bases
61 /* rtc timer and device for setting alarm wakeups at suspend */
151  * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
152  * @base: pointer to the base where the timer is being run
169  * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue
170  * @base: pointer to the base where the timer is running
189  * @timer: pointer to hrtimer being run
191  * When a alarm timer fires, this runs through the timerqueue to
194  * the next future alarm timer expires.
196 static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
198 	struct alarm *alarm = container_of(timer, struct alarm, timer);
213 		hrtimer_set_expires(&alarm->timer, alarm->node.expires);
237  * to see which is the soonest timer to expire. We then
238  * set an rtc timer to fire that far into the future, which
261 	/* Find the soonest timer to expire*/
289 	/* Setup an rtc timer to fire that far in the future */
295 	 * If the RTC alarm timer only supports a limited time offset, set the
340 	alarm->timer.function = alarmtimer_fired;
355 	hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid,
374 	hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);
401 	hrtimer_set_expires(&alarm->timer, alarm->node.expires);
402 	hrtimer_restart(&alarm->timer);
409  * alarm_try_to_cancel - Tries to cancel an alarm timer
412  * Returns 1 if the timer was canceled, 0 if it was not running,
422 	ret = hrtimer_try_to_cancel(&alarm->timer);
434  * alarm_cancel - Spins trying to cancel an alarm timer until it is done
437  * Returns 1 if the timer was canceled, 0 if it was not active.
445 		hrtimer_cancel_wait_running(&alarm->timer);
564  * @now: time at the timer expiration
566  * Posix timer callback for expired alarm timers.
568  * Return: whether the timer is to be restarted
587 		 * Handle ignored signals and rearm the timer. This will go
602  * alarm_timer_rearm - Posix timer callback for rearming timer
614  * alarm_timer_forward - Posix timer callback for forwarding timer
616  * @now:	Current time to forward the timer against
626  * alarm_timer_remaining - Posix timer callback to retrieve remaining time
638  * alarm_timer_try_to_cancel - Posix timer callback to cancel a timer
647  * alarm_timer_wait_running - Posix timer callback to wait for a timer
650  * Called from the core code when timer cancel detected that the callback
656 	hrtimer_cancel_wait_running(&timr->it.alarm.alarmtimer.timer);
660  * alarm_timer_arm - Posix timer callback to arm a timer
664  * @sigev_none:	Posix timer does not deliver signals
756  * @now: time at the timer expiration
779  * Sets the alarm timer and sleeps until it is fired or interrupted.
797 	destroy_hrtimer_on_stack(&alarm->timer);
824 	hrtimer_init_on_stack(&alarm->timer, alarm_bases[type].base_clockid,
937  * alarmtimer_init - Initialize alarm timer code