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posix-timers: Add active flag to k_itimer

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Keep track of the activation state of posix timers. This is a preparatory
change for making common_timer_get() usable by both hrtimer and alarm timer
implementations.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170530211656.967783982@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-05-30 23:15:48 +02:00
parent f37fb0aa4f
commit 21e55c1f83
2 changed files with 9 additions and 1 deletions
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2
include/linux/posix-timers.h
View File

@ -59,6 +59,7 @@ struct cpu_timer_list {
* @kclock: Pointer to the k_clock struct handling this timer
* @it_clock: The posix timer clock id
* @it_id: The posix timer id for identifying the timer
* @it_active: Marker that timer is active
* @it_overrun: The overrun counter for pending signals
* @it_overrun_last: The overrun at the time of the last delivered signal
* @it_requeue_pending: Indicator that timer waits for being requeued on
@ -79,6 +80,7 @@ struct k_itimer {
const struct k_clock *kclock;
clockid_t it_clock;
timer_t it_id;
int it_active;
int it_overrun;
int it_overrun_last;
int it_requeue_pending;

8
kernel/time/posix-timers.c
View File

@ -316,6 +316,7 @@ void posixtimer_rearm(struct siginfo *info)
if (timr->it_requeue_pending == info->si_sys_private) {
timr->kclock->timer_rearm(timr);
timr->it_active = 1;
timr->it_overrun_last = timr->it_overrun;
timr->it_overrun = -1;
++timr->it_requeue_pending;
@ -371,6 +372,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
timr = container_of(timer, struct k_itimer, it.real.timer);
spin_lock_irqsave(&timr->it_lock, flags);
timr->it_active = 0;
if (timr->it_interval != 0)
si_private = ++timr->it_requeue_pending;
@ -418,6 +420,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
timr->it_interval);
ret = HRTIMER_RESTART;
++timr->it_requeue_pending;
timr->it_active = 1;
}
}
@ -737,7 +740,8 @@ common_timer_set(struct k_itimer *timr, int flags,
if (hrtimer_try_to_cancel(timer) < 0)
return TIMER_RETRY;
timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
timr->it_active = 0;
timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
~REQUEUE_PENDING;
timr->it_overrun_last = 0;
@ -763,6 +767,7 @@ common_timer_set(struct k_itimer *timr, int flags,
return 0;
}
timr->it_active = 1;
hrtimer_start_expires(timer, mode);
return 0;
}
@ -821,6 +826,7 @@ static int common_timer_del(struct k_itimer *timer)
if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0)
return TIMER_RETRY;
timer->it_active = 0;
return 0;
}