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Expose our cached gettimeofday value with a new interface

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I've got a two use case that wants this for a fairly sensible purpose:
one external and on internal.
This commit is contained in:
Nick Mathewson 2009-12-28 01:40:37 -05:00
parent 5a43df82b8
commit 47854a802a
2 changed files with 30 additions and 0 deletions
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16
event.c
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@ -180,6 +180,22 @@ gettime(struct event_base *base, struct timeval *tp)
return (evutil_gettimeofday(tp, NULL));
}
int
event_base_gettimeofday_cached(struct event_base *base, struct timeval *tv)
{
int r;
if (!base) {
base = current_base;
if (!current_base)
return evutil_gettimeofday(tv, NULL);
}
EVBASE_ACQUIRE_LOCK(base, th_base_lock);
r = gettime(base, tv);
EVBASE_RELEASE_LOCK(base, th_base_lock);
return r;
}
static inline void
clear_time_cache(struct event_base *base)
{

14
include/event2/event.h
View File

@ -671,6 +671,20 @@ void event_set_mem_functions(void *(*malloc_fn)(size_t sz),
void event_base_dump_events(struct event_base *, FILE *);
/** Sets 'tv' to the current time (as returned by gettimeofday()),
looking at the cached value in 'base' if possible, and calling
gettimeofday() or clock_gettime() as appropriate if there is no
cached time.
Generally, this value will only be cached while actually
processing event callbacks, and may be very inaccuate if your
callbacks take a long time to execute.
Returns 0 on success, negative on failure.
*/
int event_base_gettimeofday_cached(struct event_base *base,
struct timeval *tv);
#ifdef __cplusplus
}
#endif