Libc-997.1.1.tar.gz

[apple/libc.git] / pthreads / pthread_rwlock_init.3

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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: src/lib/libc_r/man/pthread_rwlock_init.3,v 1.5 2001/10/01 16:09:09 ru Exp $
-.\"
-.Dd August 4, 1998
-.Dt PTHREAD_RWLOCK_INIT 3
-.Os
-.Sh NAME
-.Nm pthread_rwlock_init
-.Nd initialize a read/write lock
-.Sh SYNOPSIS
-.In pthread.h
-.Ft int
-.Fo pthread_rwlock_init
-.Fa "pthread_rwlock_t *restrict rwlock"
-.Fa "const pthread_rwlockattr_t *restrict attr"
-.Fc
-.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 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 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 rwlock ,
-a previously initialized but not yet destroyed read/write lock.
-.It Bq Er EINVAL
-The value specified by
-.Fa attr
-is invalid.
-.El
-.Sh HISTORY
-The
-.Fn pthread_rwlock_init
-function first appeared in
-.Fx 3.0 .
-.Sh BUGS
-The PTHREAD_PROCESS_SHARED attribute is not supported.