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alarmtimers: Add more refined alarm state tracking

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In order to allow for functionality like try_to_cancel, add
more refined  state tracking (similar to hrtimers).

CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz
2011-08-10 12:30:21 -07:00
parent 9e26476243
commit a28cde81ab
2 changed files with 47 additions and 8 deletions
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34
include/linux/alarmtimer.h
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@@ -18,6 +18,11 @@ enum alarmtimer_restart {
ALARMTIMER_RESTART,
};
#define ALARMTIMER_STATE_INACTIVE 0x00
#define ALARMTIMER_STATE_ENQUEUED 0x01
#define ALARMTIMER_STATE_CALLBACK 0x02
/**
* struct alarm - Alarm timer structure
* @node: timerqueue node for adding to the event list this value
@@ -32,7 +37,7 @@ struct alarm {
struct timerqueue_node node;
enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
enum alarmtimer_type type;
bool enabled;
int state;
void *data;
};
@@ -43,4 +48,31 @@ void alarm_cancel(struct alarm *alarm);
u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
/*
* A alarmtimer is active, when it is enqueued into timerqueue or the
* callback function is running.
*/
static inline int alarmtimer_active(const struct alarm *timer)
{
return timer->state != ALARMTIMER_STATE_INACTIVE;
}
/*
* Helper function to check, whether the timer is on one of the queues
*/
static inline int alarmtimer_is_queued(struct alarm *timer)
{
return timer->state & ALARMTIMER_STATE_ENQUEUED;
}
/*
* Helper function to check, whether the timer is running the callback
* function
*/
static inline int alarmtimer_callback_running(struct alarm *timer)
{
return timer->state & ALARMTIMER_STATE_CALLBACK;
}
#endif