#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED | |
#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED | |
// | |
// boost/detail/atomic_count_gcc.hpp | |
// | |
// atomic_count for GNU libstdc++ v3 | |
// | |
// http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html | |
// | |
// Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd. | |
// Copyright (c) 2002 Lars Gullik Bjønnes <larsbj@lyx.org> | |
// Copyright 2003-2005 Peter Dimov | |
// | |
// Distributed under the Boost Software License, Version 1.0. (See | |
// accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// | |
#if __GNUC__ * 100 + __GNUC_MINOR__ >= 402 | |
# include <ext/atomicity.h> | |
#else | |
# include <bits/atomicity.h> | |
#endif | |
namespace boost | |
{ | |
namespace detail | |
{ | |
#if defined(__GLIBCXX__) // g++ 3.4+ | |
using __gnu_cxx::__atomic_add; | |
using __gnu_cxx::__exchange_and_add; | |
#endif | |
class atomic_count | |
{ | |
public: | |
explicit atomic_count( long v ) : value_( v ) {} | |
long operator++() | |
{ | |
return __exchange_and_add( &value_, +1 ) + 1; | |
} | |
long operator--() | |
{ | |
return __exchange_and_add( &value_, -1 ) - 1; | |
} | |
operator long() const | |
{ | |
return __exchange_and_add( &value_, 0 ); | |
} | |
private: | |
atomic_count(atomic_count const &); | |
atomic_count & operator=(atomic_count const &); | |
mutable _Atomic_word value_; | |
}; | |
} // namespace detail | |
} // namespace boost | |
#endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED |