2003-07-01 14:23:52 +04:00
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.\" $NetBSD: pthread_barrier_init.3,v 1.3 2003/07/01 10:23:52 wiz Exp $
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2003-06-04 01:31:36 +04:00
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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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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 30, 2003
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.Dt PTHREAD_BARRIER_INIT 3
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.Os
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.Sh NAME
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.Nm pthread_barrier_init
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.Nd create 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_init "pthread_barrier_t *barrier" "const pthread_barrierattr_t *attr" "unsigned int count"
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.Sh DESCRIPTION
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The
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.Fn pthread_barrier_init
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function creates a new barrier, with attributes specified with
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.Fa attr
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and
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.Fa count .
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The
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.Fa count
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parameter indicates the number of threads which will participate in the barrier.
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If
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.Fa attr
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is NULL the default attributes are used.
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Barriers are most commonly used in the decomposition of parallel loops.
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.Sh RETURN VALUES
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If successful,
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.Fn pthread_barrier_init
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will return zero and put the new barrier id into
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.Fa barrier ,
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otherwise an error number will be returned to indicate the error.
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.Sh ERRORS
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.Fn pthread_barrier_init
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shall fail if:
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.Bl -tag -width Er
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.It Bq Er EAGAIN
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The system lacks the resources to initialize another barrier.
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.It Bq Er EINVAL
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The value specified by
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.Fa count
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is zero.
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.It Bq Er ENOMEM
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Insufficent memory exists to initialize the barrier.
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.El
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.Pp
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.Fn pthread_barrier_init
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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 attr
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is invalid.
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.It Bq Er EBUSY
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The barrier structure has been initialized already.
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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_wait 3 ,
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.Xr pthread_barrierattr_init 3 ,
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.Xr pthread_barrierattr_destroy 3
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.Sh STANDARDS
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.Fn pthread_barrier_init
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conforms to
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.St -p1003.1-2001 .
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