diff options
Diffstat (limited to 'contrib/libstdc++/config/cpu/i386/atomicity.h')
-rw-r--r-- | contrib/libstdc++/config/cpu/i386/atomicity.h | 89 |
1 files changed, 44 insertions, 45 deletions
diff --git a/contrib/libstdc++/config/cpu/i386/atomicity.h b/contrib/libstdc++/config/cpu/i386/atomicity.h index d619dbb..92c03d5 100644 --- a/contrib/libstdc++/config/cpu/i386/atomicity.h +++ b/contrib/libstdc++/config/cpu/i386/atomicity.h @@ -1,6 +1,6 @@ // Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*- -// Copyright (C) 2003 Free Software Foundation, Inc. +// Copyright (C) 2003, 2004 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 @@ -27,49 +27,48 @@ // 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 +#include <bits/atomicity.h> -typedef int _Atomic_word; - -template <int __inst> -struct __Atomicity_lock -{ - static volatile _Atomic_word _S_atomicity_lock; -}; - -template <int __inst> -volatile _Atomic_word __Atomicity_lock<__inst>::_S_atomicity_lock = 0; - -template volatile _Atomic_word __Atomicity_lock<0>::_S_atomicity_lock; - -static inline _Atomic_word -__attribute__ ((__unused__)) -__exchange_and_add (volatile _Atomic_word *__mem, int __val) -{ - register _Atomic_word __result, __tmp = 1; - - /* obtain the atomic exchange/add spin lock */ - do { - __asm__ __volatile__ ("xchg{l} {%0,%1|%1,%0}" - : "+m" (__Atomicity_lock<0>::_S_atomicity_lock), - "+r" (__tmp)); - } while (__tmp); - - __result = *__mem; - *__mem += __val; - - /* release spin lock */ - __Atomicity_lock<0>::_S_atomicity_lock = 0; - - return __result; -} - -static inline void -__attribute__ ((__unused__)) -__atomic_add (volatile _Atomic_word* __mem, int __val) +namespace __gnu_cxx { - __exchange_and_add (__mem, __val); -} - -#endif /* atomicity.h */ + template<int __inst> + struct _Atomicity_lock + { + static volatile _Atomic_word _S_atomicity_lock; + }; + + template<int __inst> + volatile _Atomic_word _Atomicity_lock<__inst>::_S_atomicity_lock = 0; + + template volatile _Atomic_word _Atomicity_lock<0>::_S_atomicity_lock; + + _Atomic_word + __attribute__ ((__unused__)) + __exchange_and_add(volatile _Atomic_word* __mem, int __val) + { + register _Atomic_word __result, __tmp = 1; + + // Obtain the atomic exchange/add spin lock. + do + { + __asm__ __volatile__ ("xchg{l} {%0,%1|%1,%0}" + : "=m" (_Atomicity_lock<0>::_S_atomicity_lock), + "+r" (__tmp) + : "m" (_Atomicity_lock<0>::_S_atomicity_lock)); + } + while (__tmp); + + __result = *__mem; + *__mem += __val; + + // Release spin lock. + _Atomicity_lock<0>::_S_atomicity_lock = 0; + + return __result; + } + + void + __attribute__ ((__unused__)) + __atomic_add(volatile _Atomic_word* __mem, int __val) + { __exchange_and_add(__mem, __val); } +} // namespace __gnu_cxx |