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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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd August 4, 1998
-.Dt PTHREAD_RWLOCK_WRLOCK 3
-.Os
-.Sh NAME
-.Nm pthread_rwlock_wrlock ,
-.Nm pthread_rwlock_trywrlock
-.Nd acquire a read/write lock for writing
-.Sh LIBRARY
-.Lb libc_r
-.Sh SYNOPSIS
-.In pthread.h
-.Ft int
-.Fn pthread_rwlock_wrlock "pthread_rwlock_t *lock"
-.Ft int
-.Fn pthread_rwlock_trywrlock "pthread_rwlock_t *lock"
-.Sh DESCRIPTION
-The
-.Fn pthread_rwlock_wrlock
-function blocks until a write lock can be acquired against
-.Fa lock .
-The
-.Fn pthread_rwlock_trywrlock
-function performs the same action, but does not block if the lock
-cannot be immediately obtained.
-.Pp
-The results are undefined if the calling thread already holds the
-lock at the time the call is made.
-.Sh IMPLEMENTATION NOTES
-To prevent writer starvation, writers are favored over readers.
-.Sh RETURN VALUES
-If successful, the
-.Fn pthread_rwlock_wrlock
-and
-.Fn pthread_rwlock_trywrlock
-functions will return zero. Otherwise an error number will be returned
-to indicate the error.
-.Sh SEE ALSO
-.Xr pthread_rwlock_init 3 ,
-.Xr pthread_rwlock_rdlock 3 ,
-.Xr pthread_rwlock_tryrdlock 3 ,
-.Xr pthread_rwlock_unlock 3
-.Sh STANDARDS
-The
-.Fn pthread_rwlock_wrlock
-and
-.Fn pthread_rwlock_trywrlock
-functions are expected to conform to
-.St -susv2 .
-.Sh ERRORS
-The
-.Fn pthread_rwlock_trywrlock
-function will fail if:
-.Bl -tag -width Er
-.It Bq Er EBUSY
-The calling thread is not able to acquire the lock without blocking.
-.El
-.Pp
-The
-.Fn pthread_rwlock_wrlock
-and
-.Fn pthread_rwlock_trywrlock
-functions may fail if:
-.Bl -tag -width Er
-.It Bq Er EDEADLK
-The calling thread already owns the read/write lock (for reading
-or writing).
-.It Bq Er EINVAL
-The value specified by
-.Fa lock
-is invalid.
-.It Bq Er ENOMEM
-Insufficient memory exists to initialize the lock (applies to
-statically initialized locks only).
-.El
-.Sh HISTORY
-The
-.Fn pthread_rwlock_wrlock
-function first appeared in
-.Fx 3.0 .
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