xref: /freebsd/lib/libthr/thread/thr_detach.c (revision 39beb93c)
1 /*
2  * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
3  * Copyright (C) 2003 Daniel M. Eischen <deischen@freebsd.org>
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 unmodified, this list of conditions, and the following
11  *    disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  *
29  */
30 
31 #include "namespace.h"
32 #include <sys/types.h>
33 #include <errno.h>
34 #include <pthread.h>
35 #include "un-namespace.h"
36 
37 #include "thr_private.h"
38 
39 __weak_reference(_pthread_detach, pthread_detach);
40 
41 int
42 _pthread_detach(pthread_t pthread)
43 {
44 	struct pthread *curthread = _get_curthread();
45 	int rval;
46 
47 	if (pthread == NULL)
48 		return (EINVAL);
49 
50 	THREAD_LIST_LOCK(curthread);
51 	if ((rval = _thr_find_thread(curthread, pthread,
52 			/*include dead*/1)) != 0) {
53 		THREAD_LIST_UNLOCK(curthread);
54 		return (rval);
55 	}
56 
57 	/* Check if the thread is already detached or has a joiner. */
58 	if ((pthread->tlflags & TLFLAGS_DETACHED) != 0 ||
59 	    (pthread->joiner != NULL)) {
60 		THREAD_LIST_UNLOCK(curthread);
61 		return (EINVAL);
62 	}
63 
64 	/* Flag the thread as detached. */
65 	pthread->tlflags |= TLFLAGS_DETACHED;
66 	if (pthread->state == PS_DEAD)
67 		THR_GCLIST_ADD(pthread);
68 	THREAD_LIST_UNLOCK(curthread);
69 
70 	return (0);
71 }
72