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Add functions to enable/disable periodic_event_t objects.

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This commit is contained in:
Nick Mathewson 2018-05-09 12:37:47 -04:00
parent fa7847e450
commit 80f582ae18
2 changed files with 32 additions and 1 deletions
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31
src/common/compat_libevent.c
View file

@ -253,10 +253,39 @@ periodic_timer_new(struct event_base *base,
}
timer->cb = cb;
timer->data = data;
event_add(timer->ev, (struct timeval *)tv); /*drop const for old libevent*/
periodic_timer_launch(timer, tv);
return timer;
}
/**
* Launch the timer <b>timer</b> to run at <b>tv</b> from now, and every
* <b>tv</b> thereafter.
*
* If the timer is already enabled, this function does nothing.
*/
void
periodic_timer_launch(periodic_timer_t *timer, const struct timeval *tv)
{
tor_assert(timer);
if (event_pending(timer->ev, EV_TIMEOUT, NULL))
return;
event_add(timer->ev, (struct timeval *)tv); /*drop const for old libevent*/
}
/**
* Disable the provided <b>timer</b>, but do not free it.
*
* You can reenable the same timer later with periodic_timer_launch.
*
* If the timer is already disabled, this function does nothing.
*/
void
periodic_timer_disable(periodic_timer_t *timer)
{
tor_assert(timer);
event_del(timer->ev);
}
/** Stop and free a periodic timer */
void
periodic_timer_free_(periodic_timer_t *timer)

2
src/common/compat_libevent.h
View file

@ -31,6 +31,8 @@ periodic_timer_t *periodic_timer_new(struct event_base *base,
void (*cb)(periodic_timer_t *timer, void *data),
void *data);
void periodic_timer_free_(periodic_timer_t *);
void periodic_timer_launch(periodic_timer_t *, const struct timeval *tv);
void periodic_timer_disable(periodic_timer_t *);
#define periodic_timer_free(t) \
FREE_AND_NULL(periodic_timer_t, periodic_timer_free_, (t))