diff options
Diffstat (limited to 'contrib/libstdc++/config/cpu/i386/bits/atomicity.h')
-rw-r--r-- | contrib/libstdc++/config/cpu/i386/bits/atomicity.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/libstdc++/config/cpu/i386/bits/atomicity.h b/contrib/libstdc++/config/cpu/i386/bits/atomicity.h new file mode 100644 index 0000000..4733503 --- /dev/null +++ b/contrib/libstdc++/config/cpu/i386/bits/atomicity.h @@ -0,0 +1,59 @@ +// Low-level functions for atomic operations: x86, x < 4 version -*- C++ -*- + +// Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 2, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +#ifndef _BITS_ATOMICITY_H +#define _BITS_ATOMICITY_H 1 + +typedef int _Atomic_word; + +static inline _Atomic_word +__attribute__ ((__unused__)) +__exchange_and_add (volatile _Atomic_word *__mem, int __val) +{ + register _Atomic_word __result; + __asm__ __volatile__ ("lock; xaddl %0,%2" + : "=r" (__result) + : "0" (__val), "m" (*__mem) + : "memory"); + return __result; +} + +static inline void +__attribute__ ((__unused__)) +__atomic_add (volatile _Atomic_word* __mem, int __val) +{ + __asm__ __volatile__ ("lock; addl %0,%1" + : : "ir" (__val), "m" (*__mem) : "memory"); +} + +#endif /* atomicity.h */ + + + + |