projects / thirdparty / gcc.git / blame
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1 | // Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*- |
| 2 | ||
| 2c5d0ae8 | 3 | // Copyright (C) 1999, 2000, 2001, 2004 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 | |
| 8 | // Free Software Foundation; either version 2, or (at your option) | |
| 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 | ||
| 16 | // You should have received a copy of the GNU General Public License along | |
| 17 | // with this library; see the file COPYING. If not, write to the Free | |
| 83f51799 | 18 | // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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19 | // USA. |
| 20 | ||
| 21 | // As a special exception, you may use this file as part of a free software | |
| 22 | // library without restriction. Specifically, if other files instantiate | |
| 23 | // templates or use macros or inline functions from this file, or you compile | |
| 24 | // this file and link it with other files to produce an executable, this | |
| 25 | // file does not by itself cause the resulting executable to be covered by | |
| 26 | // the GNU General Public License. This exception does not however | |
| 27 | // invalidate any other reasons why the executable file might be covered by | |
| 28 | // the GNU General Public License. | |
| 53601625 | 29 | |
| 2c5d0ae8 | 30 | #include <bits/atomicity.h> |
| 53601625 | 31 | |
| 2c5d0ae8 | 32 | namespace __gnu_cxx |
| 53601625 | 33 | { |
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34 | _Atomic_word |
| 35 | __attribute__ ((__unused__)) | |
| 36 | __exchange_and_add(volatile _Atomic_word* __mem, int __val) | |
| 37 | { | |
| 38 | register _Atomic_word __result; | |
| 39 | __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}" | |
| 40 | : "=r" (__result), "=m" (*__mem) | |
| 41 | : "0" (__val), "m" (*__mem)); | |
| 42 | return __result; | |
| 43 | } | |
| 44 | ||
| 45 | void | |
| 46 | __attribute__ ((__unused__)) | |
| 47 | __atomic_add(volatile _Atomic_word* __mem, int __val) | |
| 48 | { | |
| 49 | __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}" | |
| 50 | : "=m" (*__mem) : "ir" (__val), "m" (*__mem)); | |
| 51 | } | |
| 52 | } // namespace __gnu_cxx | |
| 53601625 | 53 |