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);
}
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);
}
}
void
_pthread_exit_mask(void *status, sigset_t *mask)
{
struct pthread *curthread = _get_curthread();
/* Check if this thread is already in the process of exiting: */
if (curthread->cancelling) {
char msg[128];
snprintf(msg, sizeof(msg), "Thread %p has called "
"pthread_exit() from a destructor. POSIX 1003.1 "
"1996 s16.2.5.2 does not allow this!", curthread);
PANIC(msg);
}
/* Flag this thread as exiting. */
curthread->cancelling = 1;
curthread->no_cancel = 1;
curthread->cancel_async = 0;
curthread->cancel_point = 0;
if (mask != NULL)
__sys_sigprocmask(SIG_SETMASK, mask, NULL);
if (curthread->unblock_sigcancel) {
sigset_t set;
curthread->unblock_sigcancel = 0;
SIGEMPTYSET(set);
SIGADDSET(set, SIGCANCEL);
__sys_sigprocmask(SIG_UNBLOCK, mask, NULL);
}
/* Save the return value: */
curthread->ret = status;
#ifdef _PTHREAD_FORCED_UNWIND
#ifdef PIC
thread_uw_init();
#endif /* PIC */
#ifdef PIC
if (uwl_forcedunwind != NULL) {
#else
if (_Unwind_ForcedUnwind != NULL) {
#endif
if (curthread->unwind_disabled) {
if (message_printed == 0) {
message_printed = 1;
_thread_printf(2, "Warning: old _pthread_cleanup_push was called, "
"stack unwinding is disabled.\n");
}
goto cleanup;
}
thread_unwind();
} else {
cleanup:
while (curthread->cleanup != NULL) {
__pthread_cleanup_pop_imp(1);
}
exit_thread();
}
#else
while (curthread->cleanup != NULL) {
__pthread_cleanup_pop_imp(1);
}
exit_thread();
#endif /* _PTHREAD_FORCED_UNWIND */
}
static void
exit_thread(void)
{
struct pthread *curthread = _get_curthread();
/* Check if there is thread specific data: */
if (curthread->specific != NULL) {
/* Run the thread-specific data destructors: */
_thread_cleanupspecific();
}
if (!_thr_isthreaded())
exit(0);
if (atomic_fetchadd_int(&_thread_active_threads, -1) == 1) {
exit(0);
/* Never reach! */
}
/* Tell malloc that the thread is exiting. */
_malloc_thread_cleanup();
THR_LOCK(curthread);
curthread->state = PS_DEAD;
if (curthread->flags & THR_FLAGS_NEED_SUSPEND) {
curthread->cycle++;
_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
}
if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH))
_thr_report_death(curthread);
/*
* Thread was created with initial refcount 1, we drop the
* reference count to allow it to be garbage collected.
*/
curthread->refcount--;
_thr_try_gc(curthread, curthread); /* thread lock released */
#if defined(_PTHREADS_INVARIANTS)
if (THR_IN_CRITICAL(curthread))
PANIC("thread exits with resources held!");
#endif
/*
* Kernel will do wakeup at the address, so joiner thread
* will be resumed if it is sleeping at the address.
*/
thr_exit(&curthread->tid);
PANIC("thr_exit() returned");
/* Never reach! */
}
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);
}
