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/*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <errno.h>
#include <pthread.h>
#include "thr_private.h"
__weak_reference(_pthread_join, pthread_join);
static void backout_join(void *arg)
{
struct pthread *curthread = _get_curthread();
struct pthread *pthread = (struct pthread *)arg;
THREAD_LIST_LOCK(curthread);
pthread->joiner = NULL;
THREAD_LIST_UNLOCK(curthread);
}
int
_pthread_join(pthread_t pthread, void **thread_return)
{
struct pthread *curthread = _get_curthread();
void *tmp;
long state;
int oldcancel;
int ret = 0;
if (pthread == NULL)
return (EINVAL);
if (pthread == curthread)
return (EDEADLK);
THREAD_LIST_LOCK(curthread);
if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
ret = ESRCH;
} else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
ret = ESRCH;
} else if (pthread->joiner != NULL) {
/* Multiple joiners are not supported. */
ret = ENOTSUP;
}
if (ret) {
THREAD_LIST_UNLOCK(curthread);
return (ret);
}
/* Set the running thread to be the joiner: */
pthread->joiner = curthread;
THREAD_LIST_UNLOCK(curthread);
THR_CLEANUP_PUSH(curthread, backout_join, pthread);
oldcancel = _thr_cancel_enter(curthread);
while ((state = pthread->state) != PS_DEAD) {
_thr_umtx_wait(&pthread->state, state, NULL);
}
_thr_cancel_leave(curthread, oldcancel);
THR_CLEANUP_POP(curthread, 0);
tmp = pthread->ret;
THREAD_LIST_LOCK(curthread);
pthread->tlflags |= TLFLAGS_DETACHED;
THR_GCLIST_ADD(pthread);
THREAD_LIST_UNLOCK(curthread);
if (thread_return != NULL)
*thread_return = tmp;
return (ret);
}
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