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Viewing changes to libs/boost-lib/boost/smart_ptr/detail/atomic_count_gcc.hpp

  • Committer: Bazaar Package Importer
  • Author(s): Alessio Treglia
  • Date: 2010-11-04 11:46:25 UTC
  • mto: This revision was merged to the branch mainline in revision 8.
  • Revision ID: james.westby@ubuntu.com-20101104114625-8xfdhvhpsm51i0nu
Tags: upstream-0.8.0
Import upstream version 0.8.0

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libs/boost-lib/boost/smart_ptr/detail/atomic_count_gcc.hpp
 
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#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 Bj�nnes <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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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