2 * Copyright (c) 2005, David Xu <davidxu@freebsd.org>
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 unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include "thr_private.h"
34 static int join_common(pthread_t, void **, const struct timespec *);
36 __weak_reference(_pthread_join, pthread_join);
37 __weak_reference(_pthread_timedjoin_np, pthread_timedjoin_np);
39 static void backout_join(void *arg)
41 struct pthread *curthread = _get_curthread();
42 struct pthread *pthread = (struct pthread *)arg;
44 THREAD_LIST_LOCK(curthread);
45 pthread->joiner = NULL;
46 THREAD_LIST_UNLOCK(curthread);
50 _pthread_join(pthread_t pthread, void **thread_return)
52 return (join_common(pthread, thread_return, NULL));
56 _pthread_timedjoin_np(pthread_t pthread, void **thread_return,
57 const struct timespec *abstime)
59 if (abstime == NULL || abstime->tv_sec < 0 || abstime->tv_nsec < 0 ||
60 abstime->tv_nsec >= 1000000000)
63 return (join_common(pthread, thread_return, abstime));
67 join_common(pthread_t pthread, void **thread_return,
68 const struct timespec *abstime)
70 struct pthread *curthread = _get_curthread();
71 struct timespec ts, ts2, *tsp;
80 if (pthread == curthread)
83 THREAD_LIST_LOCK(curthread);
84 if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
86 } else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
88 } else if (pthread->joiner != NULL) {
89 /* Multiple joiners are not supported. */
93 THREAD_LIST_UNLOCK(curthread);
96 /* Set the running thread to be the joiner: */
97 pthread->joiner = curthread;
99 THREAD_LIST_UNLOCK(curthread);
101 THR_CLEANUP_PUSH(curthread, backout_join, pthread);
102 oldcancel = _thr_cancel_enter(curthread);
105 while (pthread->tid != TID_TERMINATED) {
106 if (abstime != NULL) {
107 clock_gettime(CLOCK_REALTIME, &ts);
108 TIMESPEC_SUB(&ts2, abstime, &ts);
109 if (ts2.tv_sec < 0) {
116 ret = _thr_umtx_wait(&pthread->tid, tid, tsp);
117 if (ret == ETIMEDOUT)
121 _thr_cancel_leave(curthread, oldcancel);
122 THR_CLEANUP_POP(curthread, 0);
124 if (ret == ETIMEDOUT) {
125 THREAD_LIST_LOCK(curthread);
126 pthread->joiner = NULL;
127 THREAD_LIST_UNLOCK(curthread);
131 THREAD_LIST_LOCK(curthread);
132 pthread->tlflags |= TLFLAGS_DETACHED;
133 pthread->joiner = NULL;
134 THR_GCLIST_ADD(pthread);
135 THREAD_LIST_UNLOCK(curthread);
137 if (thread_return != NULL)
138 *thread_return = tmp;