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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.
+.\"
+.\" %FreeBSD: src/lib/libc_r/man/pthread_mutex_unlock.3,v 1.5.2.5 2001/12/17 10:08:26 ru Exp %
+.\"
+.\" $FreeBSD$
+.Dd July 30, 1998
+.Dt PTHREAD_MUTEX_UNLOCK 3
+.Os
+.Sh 名称
+.Nm pthread_mutex_unlock
+.Nd mutex のロックを解除
+.Sh ライブラリ
+.Lb libc_r
+.Sh 書式
+.In pthread.h
+.Ft int
+.Fn pthread_mutex_unlock "pthread_mutex_t *mutex"
+.Sh 解説
+現在のスレッドが
+.Fa mutex
+のロックを保持している場合には、
+.Fn pthread_mutex_unlock
+関数は、
+.Fa mutex
+のロックを解除します。
+.Sh 戻り値
+問題がない場合は、
+.Fn pthread_mutex_unlock
+は 0 を返します。
+問題がある場合は、そのエラーを示すためにエラー番号が返されます。
+.Sh エラー
+.Fn pthread_mutex_trylock
+は以下の場合に失敗します。
+.Bl -tag -width Er
+.It Bq Er EINVAL
+.Fa mutex
+によって指定された値が無効です。
+.It Bq Er EPERM
+現在のスレッドが
+.Fa mutex
+のロックを保持していません。
+.El
+.Sh 関連項目
+.Xr pthread_mutex_destroy 3 ,
+.Xr pthread_mutex_init 3 ,
+.Xr pthread_mutex_lock 3 ,
+.Xr pthread_mutex_trylock 3
+.Sh 規格
+.Fn pthread_mutex_unlock
+は
+.St -p1003.1-96
+に適合しています。