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72 lines
1.4 KiB
72 lines
1.4 KiB
#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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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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