80 lines
2.6 KiB
Groff
80 lines
2.6 KiB
Groff
.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the author nor the names of any co-contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd July 30, 1998
|
|
.Dt PTHREAD_MUTEX_TRYLOCK 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pthread_mutex_trylock
|
|
.Nd attempt to lock a mutex without blocking
|
|
.Sh LIBRARY
|
|
.Lb libc_r
|
|
.Lb libpthread
|
|
.Lb libthr
|
|
.Sh SYNOPSIS
|
|
.In pthread.h
|
|
.Ft int
|
|
.Fn pthread_mutex_trylock "pthread_mutex_t *mutex"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn pthread_mutex_trylock
|
|
function locks
|
|
.Fa mutex .
|
|
If the mutex is already locked,
|
|
.Fn pthread_mutex_trylock
|
|
will not block waiting for the mutex, but will return an error condition.
|
|
.Sh RETURN VALUES
|
|
If successful,
|
|
.Fn pthread_mutex_trylock
|
|
will return zero, otherwise an error number will be returned to
|
|
indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn pthread_mutex_trylock
|
|
function will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EINVAL
|
|
The value specified by
|
|
.Fa mutex
|
|
is invalid.
|
|
.It Bq Er EBUSY
|
|
.Fa Mutex
|
|
is already locked.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr pthread_mutex_destroy 3 ,
|
|
.Xr pthread_mutex_init 3 ,
|
|
.Xr pthread_mutex_lock 3 ,
|
|
.Xr pthread_mutex_unlock 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn pthread_mutex_trylock
|
|
function conforms to
|
|
.St -p1003.1-96 .
|