]> git.saurik.com Git - apple/libc.git/blame - pthreads/pthread_mutex_trylock.3
Libc-391.5.22.tar.gz
[apple/libc.git] / pthreads / pthread_mutex_trylock.3
CommitLineData
5b2abdfb
A
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
41The
42.Fn pthread_mutex_trylock
43function locks
44.Fa mutex .
45If the mutex is already locked,
46.Fn pthread_mutex_trylock
47will not block waiting for the mutex, but will return an error condition.
48.Sh RETURN VALUES
49If successful,
50.Fn pthread_mutex_trylock
51will return zero, otherwise an error number will be returned to
52indicate the error.
53.Sh ERRORS
54.Fn pthread_mutex_trylock
55will fail if:
56.Bl -tag -width Er
57.It Bq Er EINVAL
58The value specified by
59.Fa mutex
60is invalid.
61.It Bq Er EBUSY
62.Fa Mutex
63is 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
72conforms to
73.St -p1003.1-96 .