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1 | .\" Copyright (c) 1997 Brian Cully <shmit@kublai.com> |
2 | .\" All rights reserved. | |
3 | .\" | |
4 | .\" Redistribution and use in source and binary forms, with or without | |
5 | .\" modification, are permitted provided that the following conditions | |
6 | .\" are met: | |
7 | .\" 1. Redistributions of source code must retain the above copyright | |
8 | .\" notice, this list of conditions and the following disclaimer. | |
9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
10 | .\" notice, this list of conditions and the following disclaimer in the | |
11 | .\" documentation and/or other materials provided with the distribution. | |
12 | .\" 3. Neither the name of the author nor the names of any co-contributors | |
13 | .\" may be used to endorse or promote products derived from this software | |
14 | .\" without specific prior written permission. | |
15 | .\" | |
16 | .\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND | |
17 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
18 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
19 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
20 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
21 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
22 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
23 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
24 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
25 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
26 | .\" SUCH DAMAGE. | |
27 | .\" | |
28 | .\" $FreeBSD: src/lib/libc_r/man/pthread_mutex_trylock.3,v 1.5.2.4 2001/08/17 15:42:51 ru Exp $ | |
29 | .\" | |
30 | .Dd July 30, 1998 | |
31 | .Dt PTHREAD_MUTEX_TRYLOCK 3 | |
32 | .Os | |
33 | .Sh NAME | |
34 | .Nm pthread_mutex_trylock | |
35 | .Nd attempt to lock a mutex without blocking | |
36 | .Sh SYNOPSIS | |
37 | .Fd #include <pthread.h> | |
38 | .Ft int | |
39 | .Fn pthread_mutex_trylock "pthread_mutex_t *mutex" | |
40 | .Sh DESCRIPTION | |
41 | The | |
42 | .Fn pthread_mutex_trylock | |
43 | function locks | |
44 | .Fa mutex . | |
45 | If the mutex is already locked, | |
46 | .Fn pthread_mutex_trylock | |
47 | will not block waiting for the mutex, but will return an error condition. | |
48 | .Sh RETURN VALUES | |
49 | If successful, | |
50 | .Fn pthread_mutex_trylock | |
51 | will return zero, otherwise an error number will be returned to | |
52 | indicate the error. | |
53 | .Sh ERRORS | |
54 | .Fn pthread_mutex_trylock | |
55 | will fail if: | |
56 | .Bl -tag -width Er | |
57 | .It Bq Er EINVAL | |
58 | The value specified by | |
59 | .Fa mutex | |
60 | is invalid. | |
61 | .It Bq Er EBUSY | |
62 | .Fa Mutex | |
63 | is already locked. | |
64 | .El | |
65 | .Sh SEE ALSO | |
66 | .Xr pthread_mutex_destroy 3 , | |
67 | .Xr pthread_mutex_init 3 , | |
68 | .Xr pthread_mutex_lock 3 , | |
69 | .Xr pthread_mutex_unlock 3 | |
70 | .Sh STANDARDS | |
71 | .Fn pthread_mutex_trylock | |
72 | conforms to | |
73 | .St -p1003.1-96 . |