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 February 8, 2005 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 libc_r 38.Lb libpthread 39.Lb libthr 40.Sh SYNOPSIS 41.In pthread.h 42.Ft int 43.Fn pthread_mutex_lock "pthread_mutex_t *mutex" 44.Sh DESCRIPTION 45The 46.Fn pthread_mutex_lock 47function locks 48.Fa mutex . 49If the mutex is already locked, the calling thread will block until the 50mutex becomes available. 51.Sh RETURN VALUES 52If successful, 53.Fn pthread_mutex_lock 54will return zero, otherwise an error number will be returned to 55indicate the error. 56.Sh ERRORS 57The 58.Fn pthread_mutex_lock 59function will fail if: 60.Bl -tag -width Er 61.It Bq Er EBUSY 62Currently 63.Fa mutex 64is locked by another thread. 65.It Bq Er EINVAL 66The value specified by 67.Fa mutex 68is invalid. 69.It Bq Er EDEADLK 70A deadlock would occur if the thread blocked waiting for 71.Fa mutex . 72.El 73.Sh SEE ALSO 74.Xr pthread_mutex_destroy 3 , 75.Xr pthread_mutex_init 3 , 76.Xr pthread_mutex_trylock 3 , 77.Xr pthread_mutex_unlock 3 78.Sh STANDARDS 79The 80.Fn pthread_mutex_lock 81function conforms to 82.St -p1003.1-96 . 83