1/* Copyright (C) 2005-2020 Free Software Foundation, Inc.
2   Contributed by Richard Henderson <rth@redhat.com>.
3
4   This file is part of the GNU Offloading and Multi Processing Library
5   (libgomp).
6
7   Libgomp is free software; you can redistribute it and/or modify it
8   under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3, or (at your option)
10   any later version.
11
12   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
13   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15   more details.
16
17   Under Section 7 of GPL version 3, you are granted additional
18   permissions described in the GCC Runtime Library Exception, version
19   3.1, as published by the Free Software Foundation.
20
21   You should have received a copy of the GNU General Public License and
22   a copy of the GCC Runtime Library Exception along with this program;
23   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24   <http://www.gnu.org/licenses/>.  */
25
26/* This file contains helpers for the ATOMIC construct.  */
27
28#include "libgomp.h"
29
30/* This mutex is used when atomic operations don't exist for the target
31   in the mode requested.  The result is not globally atomic, but works so
32   long as all parallel references are within #pragma omp atomic directives.
33   According to responses received from omp@openmp.org, appears to be within
34   spec.  Which makes sense, since that's how several other compilers
35   handle this situation as well.  */
36
37static gomp_mutex_t atomic_lock;
38
39void
40GOMP_atomic_start (void)
41{
42  gomp_mutex_lock (&atomic_lock);
43}
44
45void
46GOMP_atomic_end (void)
47{
48  gomp_mutex_unlock (&atomic_lock);
49}
50
51#if !GOMP_MUTEX_INIT_0
52static void __attribute__((constructor))
53initialize_atomic (void)
54{
55  gomp_mutex_init (&atomic_lock);
56}
57#endif
58