projects / thirdparty / gcc.git / blame
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1 | // Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*- |
| 2 | ||
| 3 | // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. | |
| 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 | |
| 18 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
| 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 | |
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30 | #ifndef _GLIBCXX_ATOMICITY_H |
| 31 | #define _GLIBCXX_ATOMICITY_H 1 | |
| 53601625 NM |
32 | |
| 33 | typedef int _Atomic_word; | |
| 34 | ||
| 35 | static inline _Atomic_word | |
| f1158db3 | 36 | __attribute__ ((__unused__)) |
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37 | __exchange_and_add (volatile _Atomic_word *__mem, int __val) |
| 38 | { | |
| 39 | register _Atomic_word __result; | |
| 159ca3a3 | 40 | __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}" |
| e55393db JM |
41 | : "=r" (__result), "+m" (*__mem) |
| 42 | : "0" (__val) | |
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43 | : "memory"); |
| 44 | return __result; | |
| 45 | } | |
| 46 | ||
| 47 | static inline void | |
| 7e0ec38b | 48 | __attribute__ ((__unused__)) |
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49 | __atomic_add (volatile _Atomic_word* __mem, int __val) |
| 50 | { | |
| 159ca3a3 | 51 | __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}" |
| e55393db | 52 | : "+m" (*__mem) : "ir" (__val) : "memory"); |
| 53601625 NM |
53 | } |
| 54 | ||
| 53601625 | 55 | #endif /* atomicity.h */ |
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56 | |
| 57 |