1*38fd1498Szrj /* Copyright (C) 2005-2018 Free Software Foundation, Inc.
2*38fd1498Szrj Contributed by Richard Henderson <rth@redhat.com>.
3*38fd1498Szrj
4*38fd1498Szrj This file is part of the GNU Offloading and Multi Processing Library
5*38fd1498Szrj (libgomp).
6*38fd1498Szrj
7*38fd1498Szrj Libgomp is free software; you can redistribute it and/or modify it
8*38fd1498Szrj under the terms of the GNU General Public License as published by
9*38fd1498Szrj the Free Software Foundation; either version 3, or (at your option)
10*38fd1498Szrj any later version.
11*38fd1498Szrj
12*38fd1498Szrj Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
13*38fd1498Szrj WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14*38fd1498Szrj FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15*38fd1498Szrj more details.
16*38fd1498Szrj
17*38fd1498Szrj Under Section 7 of GPL version 3, you are granted additional
18*38fd1498Szrj permissions described in the GCC Runtime Library Exception, version
19*38fd1498Szrj 3.1, as published by the Free Software Foundation.
20*38fd1498Szrj
21*38fd1498Szrj You should have received a copy of the GNU General Public License and
22*38fd1498Szrj a copy of the GCC Runtime Library Exception along with this program;
23*38fd1498Szrj see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24*38fd1498Szrj <http://www.gnu.org/licenses/>. */
25*38fd1498Szrj
26*38fd1498Szrj /* This file contains helpers for the ATOMIC construct. */
27*38fd1498Szrj
28*38fd1498Szrj #include "libgomp.h"
29*38fd1498Szrj
30*38fd1498Szrj /* This mutex is used when atomic operations don't exist for the target
31*38fd1498Szrj in the mode requested. The result is not globally atomic, but works so
32*38fd1498Szrj long as all parallel references are within #pragma omp atomic directives.
33*38fd1498Szrj According to responses received from omp@openmp.org, appears to be within
34*38fd1498Szrj spec. Which makes sense, since that's how several other compilers
35*38fd1498Szrj handle this situation as well. */
36*38fd1498Szrj
37*38fd1498Szrj static gomp_mutex_t atomic_lock;
38*38fd1498Szrj
39*38fd1498Szrj void
GOMP_atomic_start(void)40*38fd1498Szrj GOMP_atomic_start (void)
41*38fd1498Szrj {
42*38fd1498Szrj gomp_mutex_lock (&atomic_lock);
43*38fd1498Szrj }
44*38fd1498Szrj
45*38fd1498Szrj void
GOMP_atomic_end(void)46*38fd1498Szrj GOMP_atomic_end (void)
47*38fd1498Szrj {
48*38fd1498Szrj gomp_mutex_unlock (&atomic_lock);
49*38fd1498Szrj }
50*38fd1498Szrj
51*38fd1498Szrj #if !GOMP_MUTEX_INIT_0
52*38fd1498Szrj static void __attribute__((constructor))
initialize_atomic(void)53*38fd1498Szrj initialize_atomic (void)
54*38fd1498Szrj {
55*38fd1498Szrj gomp_mutex_init (&atomic_lock);
56*38fd1498Szrj }
57*38fd1498Szrj #endif
58