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83ffe9cd | 1 | /* Copyright (C) 2005-2023 Free Software Foundation, Inc. |
6103184e | 2 | Contributed by Richard Henderson <rth@redhat.com>. |
113020dc TS |
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 | ||
6103184e AM |
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 | ||
37 | static gomp_mutex_t atomic_lock; | |
38 | ||
39 | void | |
40 | GOMP_atomic_start (void) | |
41 | { | |
42 | gomp_mutex_lock (&atomic_lock); | |
43 | } | |
44 | ||
45 | void | |
46 | GOMP_atomic_end (void) | |
47 | { | |
48 | gomp_mutex_unlock (&atomic_lock); | |
49 | } | |
50 | ||
51 | #if !GOMP_MUTEX_INIT_0 | |
52 | static void __attribute__((constructor)) | |
53 | initialize_atomic (void) | |
54 | { | |
55 | gomp_mutex_init (&atomic_lock); | |
56 | } | |
57 | #endif |