int
timer_settime( timer_t id,
int flags,
const struct itimerspec* spec,
struct itimerspec* ospec )
{
if (spec == NULL) {
errno = EINVAL;
return -1;
}
if ( __likely(!TIMER_ID_IS_WRAPPED(id)) ) {
return __timer_settime( id, flags, spec, ospec );
} else {
thr_timer_t* timer = thr_timer_from_id(id);
struct timespec expires, now;
if (timer == NULL) {
errno = EINVAL;
return -1;
}
thr_timer_lock(timer);
/* return current timer value if ospec isn't NULL */
if (ospec != NULL) {
timer_gettime_internal(timer, ospec );
}
/* compute next expiration time. note that if the
* new it_interval is 0, we should disarm the timer
*/
expires = spec->it_value;
if (!timespec_is_zero(&expires)) {
clock_gettime( timer->clock, &now );
if (!(flags & TIMER_ABSTIME)) {
timespec_add(&expires, &now);
} else {
if (timespec_cmp(&expires, &now) < 0)
expires = now;
}
}
timer->expires = expires;
timer->period = spec->it_interval;
thr_timer_unlock( timer );
/* signal the change to the thread */
pthread_cond_signal( &timer->cond );
}
return 0;
}
// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html
int timer_settime(timer_t id, int flags, const itimerspec* ts, itimerspec* ots) {
PosixTimer* timer= reinterpret_cast<PosixTimer*>(id);
int rc = __timer_settime(timer->kernel_timer_id, flags, ts, ots);
if (rc == 0) {
// Mark the timer as either being armed or disarmed. This avoids the
// callback being called after the disarm for SIGEV_THREAD timers only.
if (ts->it_value.tv_sec != 0 || ts->it_value.tv_nsec != 0) {
timer->armed = true;
} else {
timer->armed = false;
}
}
return rc;
}
// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html
int timer_settime(timer_t id, int flags, const itimerspec* ts, itimerspec* ots) {
return __timer_settime(to_kernel_timer_id(id), flags, ts, ots);
}
// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_settime.html
// When using timer_settime to disarm a repeatable SIGEV_THREAD timer with a very small
// period (like below 1ms), the kernel may continue to send events to the callback thread
// for a few extra times. This behavior is fine because in POSIX standard: The effect of
// disarming or resetting a timer with pending expiration notifications is unspecified.
int timer_settime(timer_t id, int flags, const itimerspec* ts, itimerspec* ots) {
PosixTimer* timer= reinterpret_cast<PosixTimer*>(id);
return __timer_settime(timer->kernel_timer_id, flags, ts, ots);
}
