diff options
Diffstat (limited to 'libstdc++-v3/config/cpu/generic/atomicity.h')
| -rw-r--r-- | libstdc++-v3/config/cpu/generic/atomicity.h | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/libstdc++-v3/config/cpu/generic/atomicity.h b/libstdc++-v3/config/cpu/generic/atomicity.h index 2cf6c3ced68..829a77c52cb 100644 --- a/libstdc++-v3/config/cpu/generic/atomicity.h +++ b/libstdc++-v3/config/cpu/generic/atomicity.h @@ -1,6 +1,6 @@ // Low-level functions for atomic operations: Generic version -*- C++ -*- -// Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc. +// Copyright (C) 1999, 2001, 2002, 2003 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 @@ -32,24 +32,35 @@ #include <bits/gthr.h> +#define _GLIBCPP_NEED_GENERIC_MUTEX + typedef int _Atomic_word; namespace __gnu_cxx { - __gthread_mutex_t _Atomic_add_mutex __attribute__ ((__weak__)) - = __GTHREAD_MUTEX_INIT; + extern __gthread_mutex_t _Atomic_add_mutex; + +#ifndef __GTHREAD_MUTEX_INIT + extern __gthread_once_t _Atomic_add_mutex_once; + extern void __gthread_atomic_add_mutex_once(); +#endif } static inline _Atomic_word __attribute__ ((__unused__)) __exchange_and_add (volatile _Atomic_word* __mem, int __val) { - _Atomic_word __result; +#ifndef __GTHREAD_MUTEX_INIT + __gthread_once (&__gnu_cxx::_Atomic_add_mutex_once, + __gnu_cxx::__gthread_atomic_add_mutex_once); +#endif + + _Atomic_word __result; - __gthread_mutex_lock (&__gnu_cxx::_Atomic_add_mutex); + __gthread_mutex_lock (&__gnu_cxx::_Atomic_add_mutex); - __result = *__mem; - *__mem += __val; + __result = *__mem; + *__mem += __val; __gthread_mutex_unlock (&__gnu_cxx::_Atomic_add_mutex); return __result; |