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a945c346 | 1 | /* Copyright (C) 2022-2024 Free Software Foundation, Inc. |
e6a8ae90 TC |
2 | |
3 | This file is part of the GNU Atomic Library (libatomic). | |
4 | ||
5 | Libatomic is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY | |
11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
12 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | more details. | |
14 | ||
15 | Under Section 7 of GPL version 3, you are granted additional | |
16 | permissions described in the GCC Runtime Library Exception, version | |
17 | 3.1, as published by the Free Software Foundation. | |
18 | ||
19 | You should have received a copy of the GNU General Public License and | |
20 | a copy of the GCC Runtime Library Exception along with this program; | |
21 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
22 | <http://www.gnu.org/licenses/>. */ | |
23 | ||
24 | /* Avoiding the DMB (or kernel helper) can be a good thing. */ | |
25 | #define WANT_SPECIALCASE_RELAXED | |
26 | ||
27 | /* Glibc, at least, uses acq_rel in its pthread mutex | |
28 | implementation. If the user is asking for seq_cst, | |
29 | this is insufficient. */ | |
30 | ||
31 | static inline void __attribute__((always_inline, artificial)) | |
32 | pre_seq_barrier(int model) | |
33 | { | |
34 | if (model == __ATOMIC_SEQ_CST) | |
35 | __atomic_thread_fence (__ATOMIC_SEQ_CST); | |
36 | } | |
37 | ||
38 | static inline void __attribute__((always_inline, artificial)) | |
39 | post_seq_barrier(int model) | |
40 | { | |
41 | pre_seq_barrier(model); | |
42 | } | |
43 | ||
44 | #define pre_post_seq_barrier 1 | |
45 | ||
46 | #include_next <host-config.h> |