105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/* Copyright (C) 2005, 2008, 2009 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 General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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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 General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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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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#ifdef HAVE_SYNC_BUILTINS
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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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unsigned long single_count;
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if (__builtin_expect (team == NULL, 0))
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return true;
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single_count = thr->ts.single_count++;
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return __sync_bool_compare_and_swap (&team->single_count, single_count,
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single_count + 1L);
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#else
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bool ret = gomp_work_share_start (false);
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if (ret)
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gomp_work_share_init_done ();
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gomp_work_share_end_nowait ();
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return ret;
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#endif
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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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if (first)
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{
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gomp_work_share_init_done ();
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ret = NULL;
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}
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else
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{
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gomp_team_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_team_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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