Chris@16: #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
Chris@16: #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
Chris@16: 
Chris@16: //
Chris@16: //  boost/detail/atomic_count_gcc.hpp
Chris@16: //
Chris@16: //  atomic_count for GNU libstdc++ v3
Chris@16: //
Chris@16: //  http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html
Chris@16: //
Chris@16: //  Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
Chris@16: //  Copyright (c) 2002 Lars Gullik Bjønnes <larsbj@lyx.org>
Chris@16: //  Copyright 2003-2005 Peter Dimov
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See
Chris@16: //  accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #if __GNUC__ * 100 + __GNUC_MINOR__ >= 402
Chris@16: # include <ext/atomicity.h> 
Chris@16: #else 
Chris@16: # include <bits/atomicity.h>
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16: 
Chris@16: #if defined(__GLIBCXX__) // g++ 3.4+
Chris@16: 
Chris@16: using __gnu_cxx::__atomic_add;
Chris@16: using __gnu_cxx::__exchange_and_add;
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: class atomic_count
Chris@16: {
Chris@16: public:
Chris@16: 
Chris@16:     explicit atomic_count( long v ) : value_( v ) {}
Chris@16: 
Chris@16:     long operator++()
Chris@16:     {
Chris@16:         return __exchange_and_add( &value_, +1 ) + 1;
Chris@16:     }
Chris@16: 
Chris@16:     long operator--()
Chris@16:     {
Chris@16:         return __exchange_and_add( &value_, -1 ) - 1;
Chris@16:     }
Chris@16: 
Chris@16:     operator long() const
Chris@16:     {
Chris@16:         return __exchange_and_add( &value_, 0 );
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     atomic_count(atomic_count const &);
Chris@16:     atomic_count & operator=(atomic_count const &);
Chris@16: 
Chris@16:     mutable _Atomic_word value_;
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED