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1 | // Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*- |
2 | ||
8d9254fc | 3 | // Copyright (C) 1999-2020 Free Software Foundation, Inc. |
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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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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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 | ||
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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. | |
19 | ||
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/>. | |
53601625 | 24 | |
2e362c74 | 25 | #include <ext/atomicity.h> |
53601625 | 26 | |
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27 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
28 | { | |
29 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 30 | |
f92ab29f | 31 | _Atomic_word |
2c5d0ae8 | 32 | __attribute__ ((__unused__)) |
09f2a1e4 | 33 | __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () |
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34 | { |
35 | register _Atomic_word __result; | |
36 | __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}" | |
f92ab29f | 37 | : "=r" (__result), "=m" (*__mem) |
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38 | : "0" (__val), "m" (*__mem)); |
39 | return __result; | |
40 | } | |
f92ab29f | 41 | |
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42 | void |
43 | __attribute__ ((__unused__)) | |
09f2a1e4 | 44 | __atomic_add(volatile _Atomic_word* __mem, int __val) throw () |
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45 | { |
46 | __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}" | |
47 | : "=m" (*__mem) : "ir" (__val), "m" (*__mem)); | |
48 | } | |
3cbc7af0 | 49 | |
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50 | _GLIBCXX_END_NAMESPACE_VERSION |
51 | } // namespace | |
53601625 | 52 |