1 /* $OpenBSD: uthread_detach.c,v 1.8 2002/03/07 22:36:03 fgsch Exp $ */
2 /*
3 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by John Birrell.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: uthread_detach.c,v 1.10 1999/08/28 00:03:28 peter Exp $
34 */
35 #include <errno.h>
36 #ifdef _THREAD_SAFE
37 #include <pthread.h>
38 #include "pthread_private.h"
39
40 int
pthread_detach(pthread_t pthread)41 pthread_detach(pthread_t pthread)
42 {
43 int rval = 0;
44
45 /* Check for invalid calling parameters: */
46 if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
47 /* Return an invalid argument error: */
48 rval = EINVAL;
49
50 /* Check if the thread has not been detached: */
51 else if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) {
52 /* Flag the thread as detached: */
53 pthread->attr.flags |= PTHREAD_DETACHED;
54
55 /*
56 * Defer signals to protect the scheduling queues from
57 * access by the signal handler:
58 */
59 _thread_kern_sig_defer();
60
61 /* Check if there is a joiner: */
62 if (pthread->joiner != NULL) {
63 struct pthread *joiner = pthread->joiner;
64
65 /* Make the thread runnable: */
66 PTHREAD_NEW_STATE(joiner, PS_RUNNING);
67
68 /* Set the return value for the woken thread: */
69 joiner->join_status.error = ESRCH;
70 joiner->join_status.ret = NULL;
71 joiner->join_status.thread = NULL;
72
73 /*
74 * Disconnect the joiner from the thread being detached:
75 */
76 pthread->joiner = NULL;
77 }
78
79 /*
80 * Undefer and handle pending signals, yielding if a
81 * scheduling signal occurred while in the critical region.
82 */
83 _thread_kern_sig_undefer();
84 } else
85 /* Return an error: */
86 rval = EINVAL;
87
88 /* Return the completion status: */
89 return (rval);
90 }
91 #endif
92