100 lines
3.0 KiB
Groff
100 lines
3.0 KiB
Groff
.\" 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_INIT 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pthread_rwlock_init
|
|
.Nd initialize a read/write lock
|
|
.Sh SYNOPSIS
|
|
.Fd #include <pthread.h>
|
|
.Ft int
|
|
.Fn pthread_rwlock_init "pthread_rwlock_t *lock" "const pthread_rwlockattr_t *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 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 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 HISTORY
|
|
The
|
|
.Fn pthread_rwlock_init
|
|
function first appeared in
|
|
.Fx 3.0 .
|
|
.Sh BUGS
|
|
The PTHREAD_PROCESS_SHARED attribute is not supported.
|