xref: /freebsd/lib/libthr/thread/thr_detach.c (revision a91a246563dffa876a52f53a98de4af9fa364c52)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
5  * Copyright (C) 2003 Daniel M. Eischen <deischen@freebsd.org>
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice unmodified, this list of conditions, and the following
13  *    disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include "namespace.h"
31 #include <sys/types.h>
32 #include <errno.h>
33 #include <pthread.h>
34 #include "un-namespace.h"
35 
36 #include "thr_private.h"
37 
38 __weak_reference(_thr_detach, pthread_detach);
39 __weak_reference(_thr_detach, _pthread_detach);
40 
41 int
42 _thr_detach(pthread_t pthread)
43 {
44 	struct pthread *curthread = _get_curthread();
45 	int rval;
46 
47 	if (pthread == NULL)
48 		return (EINVAL);
49 
50 	if ((rval = _thr_find_thread(curthread, pthread,
51 			/*include dead*/1)) != 0) {
52 		return (rval);
53 	}
54 
55 	/* Check if the thread is already detached or has a joiner. */
56 	if ((pthread->flags & THR_FLAGS_DETACHED) != 0 ||
57 	    (pthread->joiner != NULL)) {
58 		THR_THREAD_UNLOCK(curthread, pthread);
59 		return (EINVAL);
60 	}
61 
62 	/* Flag the thread as detached. */
63 	pthread->flags |= THR_FLAGS_DETACHED;
64 	_thr_try_gc(curthread, pthread); /* thread lock released */
65 
66 	return (0);
67 }
68