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+.\" 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.
+.\"
+.Dd July 30, 1998
+.Dt PTHREAD_MUTEX_UNLOCK 3
+.Os BSD 4
+.Sh NAME
+.Nm pthread_mutex_unlock
+.Nd unlock a mutex
+.Sh SYNOPSIS
+.Fd #include <pthread.h>
+.Ft int
+.Fn pthread_mutex_unlock "pthread_mutex_t *mutex"
+.Sh DESCRIPTION
+If the current thread holds the lock on
+.Fa mutex ,
+then the
+.Fn pthread_mutex_unlock
+function unlocks
+.Fa mutex .
+.Sh RETURN VALUES
+If successful,
+.Fn pthread_mutex_unlock
+will return zero, otherwise an error number will be returned to
+indicate the error.
+.Sh ERRORS
+.Fn pthread_mutex_trylock
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value specified by
+.Fa mutex
+is invalid.
+.It Bq Er EPERM
+The current thread does not hold a lock on
+.Fa mutex .
+.El
+.Pp
+.Sh SEE ALSO
+.Xr pthread_mutex_lock 3 ,
+.Xr pthread_mutex_trylock 3 ,
+.Xr pthread_mutex_init 3 ,
+.Xr pthread_mutex_destroy 3
+.Sh STANDARDS
+.Fn pthread_mutex_unlock
+is expected to conform to IEEE
+.Pq Dq Tn POSIX
+Std 1003.1c when it is published.