| 1 | // Low-level type for atomic operations -*- C++ -*- |
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| 2 | |
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| 3 | // Copyright (C) 2004-2021 Free Software Foundation, Inc. |
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| 4 | // |
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| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
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| 6 | // software; you can redistribute it and/or modify it under the |
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| 7 | // terms of the GNU General Public License as published by the |
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| 8 | // Free Software Foundation; either version 3, or (at your option) |
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| 9 | // any later version. |
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| 10 | |
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| 11 | // This library is distributed in the hope that it will be useful, |
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| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | // GNU General Public License for more details. |
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| 15 | |
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| 16 | // Under Section 7 of GPL version 3, you are granted additional |
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| 17 | // permissions described in the GCC Runtime Library Exception, version |
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| 18 | // 3.1, as published by the Free Software Foundation. |
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| 19 | |
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| 20 | // You should have received a copy of the GNU General Public License and |
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| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
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| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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| 23 | // <http://www.gnu.org/licenses/>. |
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| 24 | |
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| 25 | /** @file atomic_word.h |
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| 26 | * This file is a GNU extension to the Standard C++ Library. |
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| 27 | */ |
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| 28 | |
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| 29 | #ifndef _GLIBCXX_ATOMIC_WORD_H |
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| 30 | #define _GLIBCXX_ATOMIC_WORD_H 1 |
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| 31 | |
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| 32 | typedef int _Atomic_word; |
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| 33 | |
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| 34 | |
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| 35 | // This is a memory order acquire fence. |
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| 36 | #define _GLIBCXX_READ_MEM_BARRIER __atomic_thread_fence (__ATOMIC_ACQUIRE) |
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| 37 | // This is a memory order release fence. |
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| 38 | #define _GLIBCXX_WRITE_MEM_BARRIER __atomic_thread_fence (__ATOMIC_RELEASE) |
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| 39 | |
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| 40 | #endif |
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| 41 | |
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