thr_detach.c revision 129484 
1/*
2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
19 *
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
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/lib/libthr/thread/thr_detach.c 129484 2004-05-20 12:06:16Z mtm $
33 */
34#include <errno.h>
35#include <pthread.h>
36#include <stdlib.h>
37#include "thr_private.h"
38
39__weak_reference(_pthread_detach, pthread_detach);
40
41int
42_pthread_detach(pthread_t pthread)
43{
44	int error;
45
46	if (pthread->magic != PTHREAD_MAGIC)
47		return (EINVAL);
48
49	PTHREAD_LOCK(pthread);
50
51	if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) {
52		_thread_sigblock();
53		DEAD_LIST_LOCK;
54		error = pthread->isdead ? ESRCH : EINVAL;
55		DEAD_LIST_UNLOCK;
56		_thread_sigunblock();
57		PTHREAD_UNLOCK(pthread);
58		return (error);
59	}
60
61	pthread->attr.flags |= PTHREAD_DETACHED;
62
63	/* Check if there is a joiner: */
64	if (pthread->joiner != NULL) {
65		struct pthread	*joiner = pthread->joiner;
66
67		/* Set the return value for the woken thread: */
68		joiner->join_status.error = ESRCH;
69		joiner->join_status.ret = NULL;
70		joiner->join_status.thread = NULL;
71
72		/*
73		 * Disconnect the joiner from the thread being detached:
74		 */
75		pthread->joiner = NULL;
76		PTHREAD_WAKE(joiner);
77	}
78
79	PTHREAD_UNLOCK(pthread);
80
81	return (0);
82}
83