92 lines
2.8 KiB
C
92 lines
2.8 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 file handles the SINGLE construct. */
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#include "libgomp.h"
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/* This routine is called when first encountering a SINGLE construct that
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doesn't have a COPYPRIVATE clause. Returns true if this is the thread
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that should execute the clause. */
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bool
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GOMP_single_start (void)
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{
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bool ret = gomp_work_share_start (false);
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gomp_mutex_unlock (&gomp_thread ()->ts.work_share->lock);
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gomp_work_share_end_nowait ();
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return ret;
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}
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/* This routine is called when first encountering a SINGLE construct that
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does have a COPYPRIVATE clause. Returns NULL if this is the thread
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that should execute the clause; otherwise the return value is pointer
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given to GOMP_single_copy_end by the thread that did execute the clause. */
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void *
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GOMP_single_copy_start (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool first;
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void *ret;
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first = gomp_work_share_start (false);
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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if (first)
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ret = NULL;
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else
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{
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gomp_barrier_wait (&thr->ts.team->barrier);
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ret = thr->ts.work_share->copyprivate;
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gomp_work_share_end_nowait ();
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}
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return ret;
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}
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/* This routine is called when the thread that entered a SINGLE construct
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with a COPYPRIVATE clause gets to the end of the construct. */
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void
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GOMP_single_copy_end (void *data)
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{
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struct gomp_thread *thr = gomp_thread ();
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struct gomp_team *team = thr->ts.team;
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if (team != NULL)
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{
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thr->ts.work_share->copyprivate = data;
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gomp_barrier_wait (&team->barrier);
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}
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gomp_work_share_end_nowait ();
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}
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