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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 August 7, 2019
+.Dt PTHREAD_MUTEX_LOCK 3
+.Os
+.Sh NAME
+.Nm pthread_mutex_lock
+.Nd lock a mutex
+.Sh LIBRARY
+.Lb libpthread
+.Sh SYNOPSIS
+.In pthread.h
+.Ft int
+.Fn pthread_mutex_lock "pthread_mutex_t *mutex"
+.Sh DESCRIPTION
+The
+.Fn pthread_mutex_lock
+function locks
+.Fa mutex .
+If the mutex is already locked, the calling thread will block until the
+mutex becomes available.
+.Sh RETURN VALUES
+If successful,
+.Fn pthread_mutex_lock
+will return zero, otherwise an error number will be returned to
+indicate the error.
+.Sh ERRORS
+The
+.Fn pthread_mutex_lock
+function will fail if:
+.Bl -tag -width "Er ENOTRECOVERABLE"
+.It Bq Er EINVAL
+The value specified by
+.Fa mutex
+is invalid.
+.It Bq Er EDEADLK
+A deadlock would occur if the thread blocked waiting for
+.Fa mutex .
+.It Bq Er EOWNERDEAD
+The argument
+.Fa mutex
+points to a robust mutex and the process containing the previous owning
+thread terminated while holding the mutex lock.
+The lock was granted to the caller and it is up to the new owner
+to make the state consistent.
+.It Bq Er ENOTRECOVERABLE
+The state protected by the
+.Fa mutex
+is not recoverable.
+.El
+.Sh SEE ALSO
+.Xr pthread_mutex_consistent 3 ,
+.Xr pthread_mutex_destroy 3 ,
+.Xr pthread_mutex_init 3 ,
+.Xr pthread_mutex_trylock 3 ,
+.Xr pthread_mutex_unlock 3
+.Sh STANDARDS
+The
+.Fn pthread_mutex_lock
+function conforms to
+.St -p1003.1-96 .