1.\" $OpenBSD: pthread_mutex_unlock.3,v 1.5 1999/11/24 05:35:32 d Exp $ 2.\" Copyright (c) 1997 Brian Cully <shmit@kublai.com> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. Neither the name of the author nor the names of any co-contributors 14.\" may be used to endorse or promote products derived from this software 15.\" without specific prior written permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" $FreeBSD: pthread_mutex_unlock.3,v 1.5 1999/08/28 00:03:08 peter Exp $ 30.\" 31.Dd July 30, 1998 32.Dt PTHREAD_MUTEX_UNLOCK 3 33.Os 34.Sh NAME 35.Nm pthread_mutex_unlock 36.Nd unlock a mutex 37.Sh SYNOPSIS 38.Fd #include <pthread.h> 39.Ft int 40.Fn pthread_mutex_unlock "pthread_mutex_t *mutex" 41.Sh DESCRIPTION 42If the current thread holds the lock on 43.Fa mutex , 44then the 45.Fn pthread_mutex_unlock 46function unlocks 47.Fa mutex . 48.Sh RETURN VALUES 49If successful, 50.Fn pthread_mutex_unlock 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 EPERM 62The current thread does not hold a lock on 63.Fa mutex . 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_trylock 3 70.Sh STANDARDS 71.Fn pthread_mutex_unlock 72conforms to ISO/IEC 9945-1 ANSI/IEEE 73.Pq Dq Tn POSIX 74Std 1003.1 Second Edition 1996-07-12. 75