1/* Copyright (C) 2005 Free Software Foundation, Inc.
2   Contributed by Richard Henderson <rth@redhat.com>.
3
4   This file is part of the GNU OpenMP Library (libgomp).
5
6   Libgomp is free software; you can redistribute it and/or modify it
7   under the terms of the GNU Lesser General Public License as published by
8   the Free Software Foundation; either version 2.1 of the License, or
9   (at your option) any later version.
10
11   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
14   more details.
15
16   You should have received a copy of the GNU Lesser General Public License
17   along with libgomp; see the file COPYING.LIB.  If not, write to the
18   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19   MA 02110-1301, USA.  */
20
21/* As a special exception, if you link this library with other files, some
22   of which are compiled with GCC, to produce an executable, this library
23   does not by itself cause the resulting executable to be covered by the
24   GNU General Public License.  This exception does not however invalidate
25   any other reasons why the executable file might be covered by the GNU
26   General Public License.  */
27
28/* This file handles the SINGLE construct.  */
29
30#include "libgomp.h"
31
32
33/* This routine is called when first encountering a SINGLE construct that
34   doesn't have a COPYPRIVATE clause.  Returns true if this is the thread
35   that should execute the clause.  */
36
37bool
38GOMP_single_start (void)
39{
40  bool ret = gomp_work_share_start (false);
41  gomp_mutex_unlock (&gomp_thread ()->ts.work_share->lock);
42  gomp_work_share_end_nowait ();
43  return ret;
44}
45
46/* This routine is called when first encountering a SINGLE construct that
47   does have a COPYPRIVATE clause.  Returns NULL if this is the thread
48   that should execute the clause; otherwise the return value is pointer
49   given to GOMP_single_copy_end by the thread that did execute the clause.  */
50
51void *
52GOMP_single_copy_start (void)
53{
54  struct gomp_thread *thr = gomp_thread ();
55
56  bool first;
57  void *ret;
58
59  first = gomp_work_share_start (false);
60  gomp_mutex_unlock (&thr->ts.work_share->lock);
61
62  if (first)
63    ret = NULL;
64  else
65    {
66      gomp_barrier_wait (&thr->ts.team->barrier);
67
68      ret = thr->ts.work_share->copyprivate;
69      gomp_work_share_end_nowait ();
70    }
71
72  return ret;
73}
74
75/* This routine is called when the thread that entered a SINGLE construct
76   with a COPYPRIVATE clause gets to the end of the construct.  */
77
78void
79GOMP_single_copy_end (void *data)
80{
81  struct gomp_thread *thr = gomp_thread ();
82  struct gomp_team *team = thr->ts.team;
83
84  if (team != NULL)
85    {
86      thr->ts.work_share->copyprivate = data;
87      gomp_barrier_wait (&team->barrier);
88    }
89
90  gomp_work_share_end_nowait ();
91}
92