static inline void
testcancel(struct pthread *curthread)
{
if (__predict_false(SHOULD_CANCEL(curthread) &&
!THR_IN_CRITICAL(curthread)))
_pthread_exit(PTHREAD_CANCELED);
}
void
_thr_cancel_leave(struct pthread *curthread, int maycancel)
{
curthread->cancel_point = 0;
if (__predict_false(SHOULD_CANCEL(curthread) &&
!THR_IN_CRITICAL(curthread) && maycancel))
_pthread_exit(PTHREAD_CANCELED);
}
static inline void
testcancel(struct pthread *curthread)
{
int newval;
newval = curthread->cancelflags;
if (SHOULD_CANCEL(newval))
_pthread_exit(PTHREAD_CANCELED);
}
void
_thr_cancel_enter2(struct pthread *curthread, int maycancel)
{
curthread->cancel_point = 1;
if (__predict_false(SHOULD_CANCEL(curthread) &&
!THR_IN_CRITICAL(curthread))) {
if (!maycancel)
thr_wake(curthread->tid);
else
_pthread_exit(PTHREAD_CANCELED);
}
}
static int
cond_wait_user(struct pthread_cond *cvp, struct pthread_mutex *mp,
const struct timespec *abstime, int cancel)
{
struct pthread *curthread = _get_curthread();
struct sleepqueue *sq;
int recurse;
int error;
if (curthread->wchan != NULL)
PANIC("thread was already on queue.");
if (cancel)
_thr_testcancel(curthread);
_sleepq_lock(cvp);
/*
* set __has_user_waiters before unlocking mutex, this allows
* us to check it without locking in pthread_cond_signal().
*/
cvp->__has_user_waiters = 1;
curthread->will_sleep = 1;
(void)_mutex_cv_unlock(mp, &recurse);
curthread->mutex_obj = mp;
_sleepq_add(cvp, curthread);
for(;;) {
_thr_clear_wake(curthread);
_sleepq_unlock(cvp);
if (cancel) {
_thr_cancel_enter2(curthread, 0);
error = _thr_sleep(curthread, cvp->__clock_id, abstime);
_thr_cancel_leave(curthread, 0);
} else {
error = _thr_sleep(curthread, cvp->__clock_id, abstime);
}
_sleepq_lock(cvp);
if (curthread->wchan == NULL) {
error = 0;
break;
} else if (cancel && SHOULD_CANCEL(curthread)) {
sq = _sleepq_lookup(cvp);
cvp->__has_user_waiters =
_sleepq_remove(sq, curthread);
_sleepq_unlock(cvp);
curthread->mutex_obj = NULL;
_mutex_cv_lock(mp, recurse);
if (!THR_IN_CRITICAL(curthread))
_pthread_exit(PTHREAD_CANCELED);
else /* this should not happen */
return (0);
} else if (error == ETIMEDOUT) {
sq = _sleepq_lookup(cvp);
cvp->__has_user_waiters =
_sleepq_remove(sq, curthread);
break;
}
}
_sleepq_unlock(cvp);
curthread->mutex_obj = NULL;
_mutex_cv_lock(mp, recurse);
return (error);
}
