gcc_atomic.hpp

00001 //
00002 // MessagePack for C++ old gcc workaround for atomic operation
00003 //
00004 // Copyright (C) 2008-2013 FURUHASHI Sadayuki and KONDO Takatoshi
00005 //
00006 //    Distributed under the Boost Software License, Version 1.0.
00007 //    (See accompanying file LICENSE_1_0.txt or copy at
00008 //    http://www.boost.org/LICENSE_1_0.txt)
00009 //
00010 
00011 #ifndef MSGPACK_GCC_ATOMIC_HPP
00012 #define MSGPACK_GCC_ATOMIC_HPP
00013 
00014 #ifdef ENABLE_GCC_CXX_ATOMIC
00015 #if defined(__GNUC__) && ((__GNUC__*10 + __GNUC_MINOR__) < 41)
00016 
00017 #include "msgpack/gcc_atomic.h"
00018 #include <bits/atomicity.h>
00019 
00020 int _msgpack_sync_decr_and_fetch(volatile _msgpack_atomic_counter_t* ptr)
00021 {
00022     return  __gnu_cxx::__exchange_and_add(ptr, -1) - 1;
00023 }
00024 
00025 int _msgpack_sync_incr_and_fetch(volatile _msgpack_atomic_counter_t* ptr)
00026 {
00027     return  __gnu_cxx::__exchange_and_add(ptr, 1) + 1;
00028 }
00029 
00030 #endif // old gcc workaround
00031 #endif // ENABLE_GCC_CXX_ATOMIC
00032 
00033 #endif /* gcc_atomic.hpp */