62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_SYNC_HPP_INCLUDED
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//
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// boost/detail/atomic_count_sync.hpp
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//
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// atomic_count for g++ 4.1+
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//
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// http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Atomic-Builtins.html
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//
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// Copyright 2007 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 defined( __ia64__ ) && defined( __INTEL_COMPILER )
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# include <ia64intrin.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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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 __sync_add_and_fetch( &value_, 1 );
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}
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long operator--()
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{
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return __sync_add_and_fetch( &value_, -1 );
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}
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operator long() const
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{
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return __sync_fetch_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 long 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_SYNC_HPP_INCLUDED
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