/*
* Signal a condition variable, waking a specified thread.
*/
int
pthread_cond_signal_thread_np(pthread_cond_t *ocond, pthread_t thread)
{
mach_port_t mp = MACH_PORT_NULL;
if (thread) {
mp = pthread_mach_thread_np(thread);
}
return _pthread_cond_signal(ocond, false, mp);
}
int
_pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
{
pthread_rwlock_t prwlock;
struct pthread *curthread;
int ret;
if (rwlock == NULL)
return(EINVAL);
prwlock = *rwlock;
if (prwlock == NULL)
return(EINVAL);
/* grab the monitor lock */
if ((ret = _pthread_mutex_lock(&prwlock->lock)) != 0)
return(ret);
curthread = _get_curthread();
if (prwlock->state > 0) {
curthread->rdlock_count--;
prwlock->state--;
if (prwlock->state == 0 && prwlock->blocked_writers)
ret = _pthread_cond_signal(&prwlock->write_signal);
} else if (prwlock->state < 0) {
prwlock->state = 0;
if (prwlock->blocked_writers)
ret = _pthread_cond_signal(&prwlock->write_signal);
else
ret = _pthread_cond_broadcast(&prwlock->read_signal);
} else
ret = EINVAL;
/* see the comment on this in pthread_rwlock_rdlock */
_pthread_mutex_unlock(&prwlock->lock);
return (ret);
}
/*
* Signal a condition variable, waking up all threads waiting for it.
*/
int
pthread_cond_broadcast(pthread_cond_t *ocond)
{
return _pthread_cond_signal(ocond, true, MACH_PORT_NULL);
}
void
_pthread_exit(void *status)
{
struct pthread *curthread = _get_curthread();
pthread_t pthread;
/* Check if this thread is already in the process of exiting: */
if ((curthread->flags & PTHREAD_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: */
curthread->flags |= PTHREAD_EXITING;
/* 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();
}
/* Free thread-specific poll_data structure, if allocated: */
if (curthread->poll_data.fds != NULL) {
free(curthread->poll_data.fds);
curthread->poll_data.fds = NULL;
}
/*
* Lock the garbage collector mutex to ensure that the garbage
* collector is not using the dead thread list.
*/
if (_pthread_mutex_lock(&_gc_mutex) != 0)
PANIC("Cannot lock gc mutex");
/* Add this thread to the list of dead threads. */
TAILQ_INSERT_HEAD(&_dead_list, curthread, dle);
/*
* Signal the garbage collector thread that there is something
* to clean up.
*/
if (_pthread_cond_signal(&_gc_cond) != 0)
PANIC("Cannot signal gc cond");
/*
* Avoid a race condition where a scheduling signal can occur
* causing the garbage collector thread to run. If this happens,
* the current thread can be cleaned out from under us.
*/
_thread_kern_sig_defer();
/* Unlock the garbage collector mutex: */
if (_pthread_mutex_unlock(&_gc_mutex) != 0)
PANIC("Cannot unlock gc mutex");
/* Check if there is a thread joining this one: */
if (curthread->joiner != NULL) {
pthread = curthread->joiner;
curthread->joiner = NULL;
/* Make the joining thread runnable: */
PTHREAD_NEW_STATE(pthread, PS_RUNNING);
/* Set the return value for the joining thread: */
pthread->join_status.ret = curthread->ret;
pthread->join_status.error = 0;
pthread->join_status.thread = NULL;
/* Make this thread collectable by the garbage collector. */
PTHREAD_ASSERT(((curthread->attr.flags & PTHREAD_DETACHED) ==
0), "Cannot join a detached thread");
curthread->attr.flags |= PTHREAD_DETACHED;
}
/* Remove this thread from the thread list: */
TAILQ_REMOVE(&_thread_list, curthread, tle);
/* This thread will never be re-scheduled. */
_thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__);
/* This point should not be reached. */
PANIC("Dead thread has resumed");
}
