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+.\" Copyright (c) 1998 Alex Nash
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 17, 2018
+.Dt PTHREAD_RWLOCK_INIT 3
+.Os
+.Sh NAME
+.Nm pthread_rwlock_init
+.Nd initialize a read/write lock
+.Sh LIBRARY
+.Lb libpthread
+.Sh SYNOPSIS
+.In pthread.h
+.Ft int
+.Fn pthread_rwlock_init "pthread_rwlock_t *restrict lock" "const pthread_rwlockattr_t *restrict attr"
+.Sh DESCRIPTION
+The
+.Fn pthread_rwlock_init
+function is used to initialize a read/write lock, with attributes
+specified by
+.Fa attr .
+If
+.Fa attr
+is NULL, the default read/write lock attributes are used.
+.Pp
+The results of calling
+.Fn pthread_rwlock_init
+with an already initialized lock are undefined.
+.Sh RETURN VALUES
+If successful, the
+.Fn pthread_rwlock_init
+function will return zero.
+Otherwise an error number will be returned
+to indicate the error.
+.Sh ERRORS
+The
+.Fn pthread_rwlock_init
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The system lacked the necessary resources (other than memory) to
+initialize the lock.
+.It Bq Er ENOMEM
+Insufficient memory exists to initialize the lock.
+.It Bq Er EPERM
+The caller does not have sufficient privilege to perform the
+operation.
+.El
+.Pp
+The
+.Fn pthread_rwlock_init
+function may fail if:
+.Bl -tag -width Er
+.It Bq Er EBUSY
+The system has detected an attempt to re-initialize the object
+referenced by
+.Fa lock ,
+a previously initialized but not yet destroyed read/write lock.
+.It Bq Er EINVAL
+The value specified by
+.Fa attr
+is invalid.
+.El
+.Sh SEE ALSO
+.Xr pthread_rwlock_destroy 3 ,
+.Xr pthread_rwlockattr_init 3 ,
+.Xr pthread_rwlockattr_setpshared 3
+.Sh STANDARDS
+The
+.Fn pthread_rwlock_init
+function is expected to conform to
+.St -susv2 .
+.Sh HISTORY
+The
+.Fn pthread_rwlock_init
+function first appeared in
+.Fx 3.0 .