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. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/types.h>
32 #include <machine/atomic.h>
35 #include "thr_private.h"
37 LT10_COMPAT_PRIVATE(_pthread_detach);
38 LT10_COMPAT_DEFAULT(pthread_detach);
40 __weak_reference(_pthread_detach, pthread_detach);
43 _pthread_detach(pthread_t pthread)
45 struct pthread *curthread = _get_curthread();
46 struct kse_mailbox *kmbx = NULL;
47 struct pthread *joiner;
50 /* Check for invalid calling parameters: */
51 if (pthread == NULL || pthread->magic != THR_MAGIC)
52 /* Return an invalid argument error: */
55 else if ((rval = _thr_ref_add(curthread, pthread,
56 /*include dead*/1)) != 0) {
57 /* Return an error: */
60 /* Check if the thread is already detached: */
61 else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) {
62 /* Return an error: */
63 _thr_ref_delete(curthread, pthread);
66 /* Lock the detached thread: */
67 THR_SCHED_LOCK(curthread, pthread);
69 /* Flag the thread as detached: */
70 pthread->attr.flags |= PTHREAD_DETACHED;
72 /* Retrieve any joining thread and remove it: */
73 joiner = pthread->joiner;
74 if ((joiner != NULL) && (joiner->kseg == pthread->kseg)) {
76 * We already own the scheduler lock for the joiner.
77 * Take advantage of that and make the joiner runnable.
79 if (joiner->join_status.thread == pthread) {
81 * Set the return value for the woken thread:
83 joiner->join_status.error = ESRCH;
84 joiner->join_status.ret = NULL;
85 joiner->join_status.thread = NULL;
87 kmbx = _thr_setrunnable_unlocked(joiner);
91 THR_SCHED_UNLOCK(curthread, pthread);
92 /* See if there is a thread waiting in pthread_join(): */
93 if ((joiner != NULL) &&
94 (_thr_ref_add(curthread, joiner, 0) == 0)) {
95 /* Lock the joiner before fiddling with it. */
96 THR_SCHED_LOCK(curthread, joiner);
97 if (joiner->join_status.thread == pthread) {
99 * Set the return value for the woken thread:
101 joiner->join_status.error = ESRCH;
102 joiner->join_status.ret = NULL;
103 joiner->join_status.thread = NULL;
105 kmbx = _thr_setrunnable_unlocked(joiner);
107 THR_SCHED_UNLOCK(curthread, joiner);
108 _thr_ref_delete(curthread, joiner);
110 _thr_ref_delete(curthread, pthread);
115 /* Return the completion status: */