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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [libgomp/] [config/] [posix/] [bar.c] - Blame information for rev 816

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/* Copyright (C) 2005 Free Software Foundation, Inc.
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   Contributed by Richard Henderson <rth@redhat.com>.
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   This file is part of the GNU OpenMP Library (libgomp).
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   Libgomp is free software; you can redistribute it and/or modify it
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   under the terms of the GNU Lesser General Public License as published by
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   the Free Software Foundation; either version 2.1 of the License, or
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   (at your option) any later version.
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   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
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   more details.
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   You should have received a copy of the GNU Lesser General Public License
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   along with libgomp; see the file COPYING.LIB.  If not, write to the
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   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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/* As a special exception, if you link this library with other files, some
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   of which are compiled with GCC, to produce an executable, this library
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   does not by itself cause the resulting executable to be covered by the
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   GNU General Public License.  This exception does not however invalidate
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   any other reasons why the executable file might be covered by the GNU
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   General Public License.  */
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/* This is the default implementation of a barrier synchronization mechanism
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   for libgomp.  This type is private to the library.  Note that we rely on
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   being able to adjust the barrier count while threads are blocked, so the
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   POSIX pthread_barrier_t won't work.  */
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#include "libgomp.h"
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void
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gomp_barrier_init (gomp_barrier_t *bar, unsigned count)
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{
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  gomp_mutex_init (&bar->mutex1);
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#ifndef HAVE_SYNC_BUILTINS
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  gomp_mutex_init (&bar->mutex2);
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#endif
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  gomp_sem_init (&bar->sem1, 0);
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  gomp_sem_init (&bar->sem2, 0);
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  bar->total = count;
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  bar->arrived = 0;
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}
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void
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gomp_barrier_destroy (gomp_barrier_t *bar)
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{
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  /* Before destroying, make sure all threads have left the barrier.  */
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  gomp_mutex_lock (&bar->mutex1);
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  gomp_mutex_unlock (&bar->mutex1);
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  gomp_mutex_destroy (&bar->mutex1);
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#ifndef HAVE_SYNC_BUILTINS
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  gomp_mutex_destroy (&bar->mutex2);
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#endif
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  gomp_sem_destroy (&bar->sem1);
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  gomp_sem_destroy (&bar->sem2);
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}
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void
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gomp_barrier_reinit (gomp_barrier_t *bar, unsigned count)
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{
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  gomp_mutex_lock (&bar->mutex1);
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  bar->total = count;
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  gomp_mutex_unlock (&bar->mutex1);
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}
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void
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gomp_barrier_wait_end (gomp_barrier_t *bar, bool last)
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{
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  unsigned int n;
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  if (last)
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    {
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      n = --bar->arrived;
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      if (n > 0)
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        {
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          do
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            gomp_sem_post (&bar->sem1);
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          while (--n != 0);
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          gomp_sem_wait (&bar->sem2);
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        }
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      gomp_mutex_unlock (&bar->mutex1);
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    }
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  else
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    {
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      gomp_mutex_unlock (&bar->mutex1);
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      gomp_sem_wait (&bar->sem1);
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#ifdef HAVE_SYNC_BUILTINS
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      n = __sync_add_and_fetch (&bar->arrived, -1);
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#else
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      gomp_mutex_lock (&bar->mutex2);
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      n = --bar->arrived;
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      gomp_mutex_unlock (&bar->mutex2);
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#endif
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      if (n == 0)
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        gomp_sem_post (&bar->sem2);
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    }
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}
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void
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gomp_barrier_wait (gomp_barrier_t *barrier)
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{
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  gomp_barrier_wait_end (barrier, gomp_barrier_wait_start (barrier));
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}

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