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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [libgomp/] [single.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 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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