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.Dd July 30, 1998 29.Dt PTHREAD_MUTEX_UNLOCK 3 30.Os BSD 4 31.Sh NAME 32.Nm pthread_mutex_unlock 33.Nd unlock a mutex 34.Sh SYNOPSIS 35.Fd #include <pthread.h> 36.Ft int 37.Fn pthread_mutex_unlock "pthread_mutex_t *mutex" 38.Sh DESCRIPTION 39If the current thread holds the lock on 40.Fa mutex , 41then the 42.Fn pthread_mutex_unlock 43function unlocks 44.Fa mutex . 45.Sh RETURN VALUES 46If successful, 47.Fn pthread_mutex_unlock 48will return zero, otherwise an error number will be returned to 49indicate the error. 50.Sh ERRORS 51.Fn pthread_mutex_trylock 52will fail if: 53.Bl -tag -width Er 54.It Bq Er EINVAL 55The value specified by 56.Fa mutex 57is invalid. 58.It Bq Er EPERM 59The current thread does not hold a lock on 60.Fa mutex . 61.El 62.Pp 63.Sh SEE ALSO 64.Xr pthread_mutex_destroy 3 , 65.Xr pthread_mutex_init 3 , 66.Xr pthread_mutex_lock 3 , 67.Xr pthread_mutex_trylock 3 68.Sh STANDARDS 69.Fn pthread_mutex_unlock 70conforms to ISO/IEC 9945-1 ANSI/IEEE 71.Pq Dq Tn POSIX 72Std 1003.1 Second Edition 1996-07-12. 73