.\" $NetBSD: pthread_barrierattr.3,v 1.11 2016/07/05 10:04:17 wiz Exp $
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
.\"
.Dd June 12, 2016
.Dt PTHREAD_BARRIERATTR 3
.Os
.Sh NAME
.Nm pthread_barrierattr_init ,
.Nm pthread_barrierattr_destroy ,
.Nm pthread_barrierattr_getpshared ,
.Nm pthread_barrierattr_setpshared
.Nd barrier attribute operations
.Sh LIBRARY
.Lb libpthread
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fn pthread_barrierattr_init "pthread_barrierattr_t *attr"
.Ft int
.Fn pthread_barrierattr_destroy "pthread_barrierattr_t *attr"
.Ft int
.Fn pthread_barrierattr_getpshared "const pthread_barrierattr_t * __restrict attr" "int * __restrict pshared"
.Ft int
.Fn pthread_barrierattr_setpshared "pthread_barrierattr_t * attr" "int pshared"
.Sh DESCRIPTION
Barrier attributes are used to specify parameters to be used with
.Xr pthread_barrier_init 3 .
One attribute object can be used in multiple calls to
.Fn pthread_barrier_init ,
with or without modifications between calls.
.Pp
The
.Fn pthread_barrierattr_init
function initializes
.Fa attr
with the default barrier attributes.
.Pp
The
.Fn pthread_barrierattr_destroy
function destroys
.Fa attr .
.Pp
The
.Fn pthread_barrierattr_getpshared
function shall obtain the value of the process-shared attribute
from the attributes object referenced by
.Fa attr .
.Pp
The
.Fn pthread_barrierattr_setpshared
function shall set the process-shared attribute in an initialized
attributes object referenced by
.Fa attr .
.Sh RETURN VALUES
If successful, these functions return 0.
Otherwise, an error number is returned to indicate the error.
.Sh ERRORS
No error codes are defined for
.Fn pthread_barrierattr_init .
.Pp
The
.Fn pthread_barrierattr_destroy
function may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.El
.Pp
The
.Fn pthread_barrierattr_getpshared
and
.Fn pthread_barrierattr_setpshared
may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
is invalid.
.El
.Sh SEE ALSO
.Xr pthread_barrier_init 3
.Sh STANDARDS
Both functions conform to
.St -p1003.1-2001 .
.Sh BUGS
The
.Fn pthread_barrierattr_getpshared
and
.Fn pthread_barrierattr_setpshared
functions are hidden by default since only thread shared attributes
are supported.