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ddd48f50 | 1 | // Low-level functions for atomic operations: Generic version -*- C++ -*- |
2 | ||
fbd26352 | 3 | // Copyright (C) 1999-2019 Free Software Foundation, Inc. |
ddd48f50 | 4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
6bc9506f | 8 | // Free Software Foundation; either version 3, or (at your option) |
ddd48f50 | 9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
6bc9506f | 16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
ddd48f50 | 19 | |
6bc9506f | 20 | // You should have received a copy of the GNU General Public License and |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
b9e8095b | 24 | |
72de368c | 25 | #include <ext/atomicity.h> |
26 | #include <ext/concurrence.h> | |
f41d3dfd | 27 | |
33b7ef52 | 28 | namespace |
a7f96d1c | 29 | { |
9e57b7da | 30 | __gnu_cxx::__mutex& |
31 | get_atomic_mutex() | |
32 | { | |
33 | static __gnu_cxx::__mutex atomic_mutex; | |
34 | return atomic_mutex; | |
35 | } | |
29b00143 | 36 | } // anonymous namespace |
dafa71aa | 37 | |
2948dd21 | 38 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
39 | { | |
40 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
1069247d | 41 | |
94540c6b | 42 | _Atomic_word |
43 | __attribute__ ((__unused__)) | |
e49af22b | 44 | __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () |
94540c6b | 45 | { |
9e57b7da | 46 | __gnu_cxx::__scoped_lock sentry(get_atomic_mutex()); |
94540c6b | 47 | _Atomic_word __result; |
94540c6b | 48 | __result = *__mem; |
49 | *__mem += __val; | |
94540c6b | 50 | return __result; |
51 | } | |
b9e8095b | 52 | |
94540c6b | 53 | void |
54 | __attribute__ ((__unused__)) | |
e49af22b | 55 | __atomic_add(volatile _Atomic_word* __mem, int __val) throw () |
94540c6b | 56 | { __exchange_and_add(__mem, __val); } |
1069247d | 57 | |
2948dd21 | 58 | _GLIBCXX_END_NAMESPACE_VERSION |
59 | } // namespace |