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git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@29033 a95241bf-73f2-0310-859d-f6bbb57e9c96
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/* 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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