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