2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/lib/libpthread/thread/thr_join.c,v 1.28 2003/12/09 02:20:56 davidxu Exp $
33 * $DragonFly: src/lib/libthread_xu/thread/thr_join.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
37 #include "thr_private.h"
39 __weak_reference(_pthread_join, pthread_join);
41 static void backout_join(void *arg)
43 struct pthread *curthread = _get_curthread();
44 struct pthread *pthread = (struct pthread *)arg;
46 THREAD_LIST_LOCK(curthread);
47 pthread->joiner = NULL;
48 THREAD_LIST_UNLOCK(curthread);
52 _pthread_join(pthread_t pthread, void **thread_return)
54 struct pthread *curthread = _get_curthread();
63 if (pthread == curthread)
66 THREAD_LIST_LOCK(curthread);
67 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
69 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
71 } else if (pthread->joiner != NULL) {
72 /* Multiple joiners are not supported. */
76 THREAD_LIST_UNLOCK(curthread);
79 /* Set the running thread to be the joiner: */
80 pthread->joiner = curthread;
82 THREAD_LIST_UNLOCK(curthread);
84 THR_CLEANUP_PUSH(curthread, backout_join, pthread);
85 oldcancel = _thr_cancel_enter(curthread);
87 while ((state = pthread->state) != PS_DEAD) {
88 _thr_umtx_wait(&pthread->state, state, NULL);
91 _thr_cancel_leave(curthread, oldcancel);
92 THR_CLEANUP_POP(curthread, 0);
95 THREAD_LIST_LOCK(curthread);
96 pthread->tlflags |= TLFLAGS_DETACHED;
97 THR_GCLIST_ADD(pthread);
98 THREAD_LIST_UNLOCK(curthread);
100 if (thread_return != NULL)
101 *thread_return = tmp;