c0e366326f
UNIX Specification. As with our standard mutexes, process shared locks are not supported at this time.
100 lines
3.0 KiB
Groff
100 lines
3.0 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_INIT 3
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.Os
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.Sh NAME
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.Nm pthread_rwlock_init
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.Nd initialize 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_init "pthread_rwlock_t *lock" "const pthread_rwlockattr_t *attr"
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.Sh DESCRIPTION
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The
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.Fn pthread_rwlock_init
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function is used to initialize a read/write lock, with attributes
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specified by
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.Fa attr .
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If
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.Fa attr
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is NULL, the default read/write lock attributes are used.
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.Pp
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The results of calling
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.Fn pthread_rwlock_init
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with an already initialized lock are undefined.
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.Sh RETURN VALUES
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If successful, the
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.Fn pthread_rwlock_init
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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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.Sh SEE ALSO
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.Xr pthread_rwlock_destroy 3 ,
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.Xr pthread_rwlockattr_init 3 ,
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.Xr pthread_rwlockattr_setpshared 3
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.Sh STANDARDS
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The
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.Fn pthread_rwlock_init
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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_init
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EAGAIN
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The system lacked the necessary resources (other than memory) to
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initialize the lock.
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.It Bq Er ENOMEM
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Insufficient memory exists to initialize the lock.
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.It Bq Er EPERM
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The caller does not have sufficient privilege to perform the
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operation.
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.El
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.Pp
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The
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.Fn pthread_rwlock_init
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function may fail if:
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.Bl -tag -width Er
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.It Bq Er EBUSY
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The system has detected an attempt to re-initialize the object
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referenced by
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.Fa lock ,
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a previously initialized but not yet destroyed read/write lock.
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.It Bq Er EINVAL
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The value specified by
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.Fa attr
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is invalid.
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.El
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.Sh HISTORY
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The
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.Fn pthread_rwlock_init
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function first appeared in
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.Fx 3.0 .
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.Sh BUGS
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The PTHREAD_PROCESS_SHARED attribute is not supported.
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