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 * $Id: uthread_join.c,v 1.7 1999/06/20 08:28:29 jb Exp $
37 #include "pthread_private.h"
40 pthread_join(pthread_t pthread, void **thread_return)
43 pthread_t pthread1 = NULL;
45 /* Check if the caller has specified an invalid thread: */
46 if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
50 /* Check if the caller has specified itself: */
51 if (pthread == _thread_run)
52 /* Avoid a deadlock condition: */
56 * Find the thread in the list of active threads or in the
57 * list of dead threads:
59 if (_find_thread(pthread) == 0 ||
60 _find_dead_thread(pthread) == 0)
64 /* Return an error: */
67 /* Check if this thread has been detached: */
68 else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0)
69 /* Return an error: */
72 /* Check if the thread is not dead: */
73 else if (pthread->state != PS_DEAD) {
74 /* Add the running thread to the join queue: */
75 TAILQ_INSERT_TAIL(&(pthread->join_queue), _thread_run, qe);
77 /* Schedule the next thread: */
78 _thread_kern_sched_state(PS_JOIN, __FILE__, __LINE__);
80 /* Check if the thread is not detached: */
81 if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) {
82 /* Check if the return value is required: */
84 /* Return the thread's return value: */
85 *thread_return = pthread->ret;
88 /* Return an error: */
91 /* Check if the return value is required: */
92 } else if (thread_return != NULL)
93 /* Return the thread's return value: */
94 *thread_return = pthread->ret;
96 /* Return the completion status: */