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9082c465a5
There's a number of edge cases when cancelling a alarm, so to be sure we accurately do so, introduce try_to_cancel, which returns proper failure errors if it cannot. Also modify cancel to spin until the alarm is properly disabled. CC: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
#ifndef _LINUX_ALARMTIMER_H
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#define _LINUX_ALARMTIMER_H
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#include <linux/time.h>
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#include <linux/hrtimer.h>
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#include <linux/timerqueue.h>
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#include <linux/rtc.h>
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enum alarmtimer_type {
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ALARM_REALTIME,
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ALARM_BOOTTIME,
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ALARM_NUMTYPE,
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};
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enum alarmtimer_restart {
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ALARMTIMER_NORESTART,
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ALARMTIMER_RESTART,
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};
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#define ALARMTIMER_STATE_INACTIVE 0x00
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#define ALARMTIMER_STATE_ENQUEUED 0x01
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#define ALARMTIMER_STATE_CALLBACK 0x02
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/**
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* struct alarm - Alarm timer structure
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* @node: timerqueue node for adding to the event list this value
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* also includes the expiration time.
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* @period: Period for recuring alarms
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* @function: Function pointer to be executed when the timer fires.
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* @type: Alarm type (BOOTTIME/REALTIME)
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* @enabled: Flag that represents if the alarm is set to fire or not
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* @data: Internal data value.
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*/
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struct alarm {
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struct timerqueue_node node;
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enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
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enum alarmtimer_type type;
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int state;
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void *data;
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};
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void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
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enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
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void alarm_start(struct alarm *alarm, ktime_t start);
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int alarm_try_to_cancel(struct alarm *alarm);
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int alarm_cancel(struct alarm *alarm);
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u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
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/*
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* A alarmtimer is active, when it is enqueued into timerqueue or the
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* callback function is running.
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*/
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static inline int alarmtimer_active(const struct alarm *timer)
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{
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return timer->state != ALARMTIMER_STATE_INACTIVE;
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}
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/*
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* Helper function to check, whether the timer is on one of the queues
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*/
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static inline int alarmtimer_is_queued(struct alarm *timer)
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{
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return timer->state & ALARMTIMER_STATE_ENQUEUED;
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}
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/*
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* Helper function to check, whether the timer is running the callback
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* function
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*/
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static inline int alarmtimer_callback_running(struct alarm *timer)
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{
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return timer->state & ALARMTIMER_STATE_CALLBACK;
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}
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#endif
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