80 lines
3.1 KiB
Groff
80 lines
3.1 KiB
Groff
.\" $NetBSD: pthread_barrier_wait.3,v 1.4 2003/07/04 08:41:25 wiz Exp $
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.\"
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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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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.\" 3. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 30, 2003
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.Dt PTHREAD_BARRIER_WAIT 3
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.Os
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.Sh NAME
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.Nm pthread_barrier_wait
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.Nd wait for a barrier
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.Sh LIBRARY
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.Lb libpthread
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.Sh SYNOPSIS
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.In pthread.h
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.Ft int
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.Fn pthread_barrier_wait "pthread_barrier_t *barrier"
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.Sh DESCRIPTION
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The
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.Fn pthread_barrier_wait
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function causes the current thread to wait on the barrier specified.
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Once as many threads as specified by the
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.Fa count
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parameter to the corresponding
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.Fn pthread_barrier_init
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call have called
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.Fn pthread_barrier_wait ,
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all threads will wake up, return from their respective
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.Fn pthread_barrier_wait
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calls and continue execution.
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.Sh RETURN VALUES
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If successful,
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.Fn pthread_barrier_wait
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will return zero for all waiting threads except for one. One thread will
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receive status
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.Dv PTHREAD_BARRIER_SERIAL_THREAD ,
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which is intended to indicate that this thead may be used to update
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shared data. It is the responsibilty of this thread to insure the visibility and atomicity of any updates to shared data with respect to the other threads participating in the barrier.
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In the case of failure, an error value will be returned.
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.Sh ERRORS
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.Fn pthread_barrier_wait
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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 barrier
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is invalid.
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.El
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.Sh SEE ALSO
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.Xr pthread_barrier_destroy 3 ,
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.Xr pthread_barrier_init 3 ,
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.Xr pthread_barrierattr_destroy 3 ,
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.Xr pthread_barrierattr_init 3
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.Sh STANDARDS
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.Fn pthread_barrier_wait
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conforms to
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.St -p1003.1-2001 .
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