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UNIX Specification. As with our standard mutexes, process shared locks are not supported at this time.
80 lines
2.5 KiB
Groff
80 lines
2.5 KiB
Groff
.\" Copyright (c) 1998 Alex Nash
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id$
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.\"
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.Dd August 4, 1998
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.Dt PTHREAD_RWLOCK_UNLOCK 3
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.Os
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.Sh NAME
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.Nm pthread_rwlock_unlock
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.Nd release a read/write lock
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.Sh SYNOPSIS
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.Fd #include <pthread.h>
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.Ft int
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.Fn pthread_rwlock_unlock "pthread_rwlock_t *lock"
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.Sh DESCRIPTION
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The
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.Fn pthread_rwlock_unlock
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function is used to release the read/write lock previously obtained by
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.Fn pthread_rwlock_rdlock ,
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.Fn pthread_rwlock_wrlock ,
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.Fn pthread_rwlock_tryrdlock ,
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or
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.Fn pthread_rwlock_trywrlock .
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.Sh RETURN VALUES
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If successful, the
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.Fn pthread_rwlock_unlock
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function will return zero. Otherwise an error number will be returned
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to indicate the error.
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.Pp
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The results are undefined if
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.Fa lock
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is not held by the calling thread.
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.Sh SEE ALSO
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.Xr pthread_rwlock_rdlock 3 ,
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.Xr pthread_rwlock_wrlock 3
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.Sh STANDARDS
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The
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.Fn pthread_rwlock_unlock
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function is expected to conform to
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.St -susv2 .
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.Sh ERRORS
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The
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.Fn pthread_rwlock_unlock
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function may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value specified by
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.Fa lock
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is invalid.
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.It Bq Er EPERM
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The current thread does not own the read/write lock.
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.El
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.Sh HISTORY
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The
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.Fn pthread_rwlock_unlock
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function first appeared in
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.Fx 3.0 .
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