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.\" $FreeBSD$ 29.\" 30.Dd January 31, 2006 31.Dt PTHREAD_MUTEX_LOCK 3 32.Os 33.Sh NAME 34.Nm pthread_mutex_lock 35.Nd lock a mutex 36.Sh LIBRARY 37.Lb libpthread 38.Lb libthr 39.Sh SYNOPSIS 40.In pthread.h 41.Ft int 42.Fn pthread_mutex_lock "pthread_mutex_t *mutex" 43.Sh DESCRIPTION 44The 45.Fn pthread_mutex_lock 46function locks 47.Fa mutex . 48If the mutex is already locked, the calling thread will block until the 49mutex becomes available. 50.Sh RETURN VALUES 51If successful, 52.Fn pthread_mutex_lock 53will return zero, otherwise an error number will be returned to 54indicate the error. 55.Sh ERRORS 56The 57.Fn pthread_mutex_lock 58function will fail if: 59.Bl -tag -width Er 60.It Bq Er EINVAL 61The value specified by 62.Fa mutex 63is invalid. 64.It Bq Er EDEADLK 65A deadlock would occur if the thread blocked waiting for 66.Fa mutex . 67.El 68.Sh SEE ALSO 69.Xr pthread_mutex_destroy 3 , 70.Xr pthread_mutex_init 3 , 71.Xr pthread_mutex_trylock 3 , 72.Xr pthread_mutex_unlock 3 73.Sh STANDARDS 74The 75.Fn pthread_mutex_lock 76function conforms to 77.St -p1003.1-96 . 78