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
37 #include "pthread_private.h"
40 pthread_join(pthread_t pthread, void **thread_return)
43 pthread_t pthread1 = NULL;
45 _thread_enter_cancellation_point();
47 /* Check if the caller has specified an invalid thread: */
48 if (pthread == NULL || pthread->magic != PTHREAD_MAGIC) {
50 _thread_leave_cancellation_point();
54 /* Check if the caller has specified itself: */
55 if (pthread == _thread_run) {
56 /* Avoid a deadlock condition: */
57 _thread_leave_cancellation_point();
62 * Find the thread in the list of active threads or in the
63 * list of dead threads:
65 if (_find_thread(pthread) == 0 ||
66 _find_dead_thread(pthread) == 0)
70 /* Return an error: */
73 /* Check if this thread has been detached: */
74 else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0)
75 /* Return an error: */
78 /* Check if the thread is not dead: */
79 else if (pthread->state != PS_DEAD) {
80 /* Clear the interrupted flag: */
81 _thread_run->interrupted = 0;
84 * Protect against being context switched out while
85 * adding this thread to the join queue.
87 _thread_kern_sig_defer();
89 /* Add the running thread to the join queue: */
90 TAILQ_INSERT_TAIL(&(pthread->join_queue), _thread_run, qe);
92 /* Schedule the next thread: */
93 _thread_kern_sched_state(PS_JOIN, __FILE__, __LINE__);
95 if (_thread_run->interrupted != 0)
96 TAILQ_REMOVE(&(pthread->join_queue), _thread_run, qe);
98 _thread_kern_sig_undefer();
100 if (_thread_run->interrupted != 0 &&
101 _thread_run->continuation != NULL)
102 _thread_run->continuation(_thread_run);
104 /* Check if the thread is not detached: */
105 if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) {
106 /* Check if the return value is required: */
108 /* Return the thread's return value: */
109 *thread_return = pthread->ret;
112 /* Return an error: */
115 /* Check if the return value is required: */
116 } else if (thread_return != NULL)
117 /* Return the thread's return value: */
118 *thread_return = pthread->ret;
120 _thread_leave_cancellation_point();
122 /* Return the completion status: */