int
_sigsuspend(const sigset_t *set)
{
struct pthread *curthread = _get_curthread();
sigset_t oldmask, newmask, tempset;
int ret = -1;
if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
return (__sys_sigsuspend(set));
/* Check if a new signal set was provided by the caller: */
if (set != NULL) {
newmask = *set;
SIG_CANTMASK(newmask);
THR_LOCK_SWITCH(curthread);
/* Save current sigmask: */
oldmask = curthread->sigmask;
curthread->oldsigmask = &oldmask;
/* Change the caller's mask: */
curthread->sigmask = newmask;
tempset = curthread->sigpend;
SIGSETNAND(tempset, newmask);
if (SIGISEMPTY(tempset)) {
THR_SET_STATE(curthread, PS_SIGSUSPEND);
/* Wait for a signal: */
_thr_sched_switch_unlocked(curthread);
} else {
curthread->check_pending = 1;
THR_UNLOCK_SWITCH(curthread);
/* check pending signal I can handle: */
_thr_sig_check_pending(curthread);
}
if ((curthread->cancelflags & THR_CANCELLING) != 0)
curthread->oldsigmask = NULL;
else {
THR_ASSERT(curthread->oldsigmask == NULL,
"oldsigmask is not cleared");
}
/* Always return an interrupted error: */
errno = EINTR;
} else {
/* Return an invalid argument error: */
errno = EINVAL;
}
/* Return the completion status: */
return (ret);
}
void
_pthread_exit(void *status)
{
struct pthread *curthread = _get_curthread();
kse_critical_t crit;
struct kse *curkse;
/* Check if this thread is already in the process of exiting: */
if ((curthread->flags & THR_FLAGS_EXITING) != 0) {
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. Threads should now be prevented
* from joining to this thread.
*/
THR_SCHED_LOCK(curthread, curthread);
curthread->flags |= THR_FLAGS_EXITING;
THR_SCHED_UNLOCK(curthread, curthread);
/*
* To avoid signal-lost problem, if signals had already been
* delivered to us, handle it. we have already set EXITING flag
* so no new signals should be delivered to us.
* XXX this is not enough if signal was delivered just before
* thread called sigprocmask and masked it! in this case, we
* might have to re-post the signal by kill() if the signal
* is targeting process (not for a specified thread).
* Kernel has same signal-lost problem, a signal may be delivered
* to a thread which is on the way to call sigprocmask or thr_exit()!
*/
if (curthread->check_pending)
_thr_sig_check_pending(curthread);
/* Save the return value: */
curthread->ret = status;
while (curthread->cleanup != NULL) {
_pthread_cleanup_pop(1);
}
if (curthread->attr.cleanup_attr != NULL) {
curthread->attr.cleanup_attr(curthread->attr.arg_attr);
}
/* Check if there is thread specific data: */
if (curthread->specific != NULL) {
/* Run the thread-specific data destructors: */
_thread_cleanupspecific();
}
if (!_kse_isthreaded())
exit(0);
crit = _kse_critical_enter();
curkse = _get_curkse();
KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock);
/* Use thread_list_lock */
_thread_active_threads--;
if ((_thread_scope_system <= 0 && _thread_active_threads == 1) ||
(_thread_scope_system > 0 && _thread_active_threads == 0)) {
KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
_kse_critical_leave(crit);
exit(0);
/* Never reach! */
}
KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
/* This thread will never be re-scheduled. */
KSE_LOCK(curkse);
THR_SET_STATE(curthread, PS_DEAD);
_thr_sched_switch_unlocked(curthread);
/* Never reach! */
/* This point should not be reached. */
PANIC("Dead thread has resumed");
}
