diff options
Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h')
-rw-r--r-- | gcc-4.4.3/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h b/gcc-4.4.3/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h new file mode 100644 index 000000000..d8a5245c6 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/config/cpu/generic/atomicity_mutex/atomicity.h @@ -0,0 +1,61 @@ +// Low-level functions for atomic operations: Generic version -*- C++ -*- + +// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2009 +// 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 3, 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. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/** @file ext/atomicity.h + * This file is a GNU extension to the Standard C++ Library. + */ + +#include <ext/atomicity.h> +#include <ext/concurrence.h> + +namespace +{ + __gnu_cxx::__mutex& + get_atomic_mutex() + { + static __gnu_cxx::__mutex atomic_mutex; + return atomic_mutex; + } +} // anonymous namespace + +_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) + + _Atomic_word + __attribute__ ((__unused__)) + __exchange_and_add(volatile _Atomic_word* __mem, int __val) + { + __gnu_cxx::__scoped_lock sentry(get_atomic_mutex()); + _Atomic_word __result; + __result = *__mem; + *__mem += __val; + return __result; + } + + void + __attribute__ ((__unused__)) + __atomic_add(volatile _Atomic_word* __mem, int __val) + { __exchange_and_add(__mem, __val); } + +_GLIBCXX_END_NAMESPACE |