boost/detail/atomic_count_gcc.hpp
#ifndef BOOST_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
#define BOOST_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
//
// boost/detail/atomic_count_gcc.hpp
//
// atomic_count for GNU libstdc++ v3
//
// http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html
//
// Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
// Copyright (c) 2002 Lars Gullik Bj�nnes <larsbj@lyx.org>
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
#include <bits/atomicity.h>
namespace boost
{
namespace detail
{
class atomic_count
{
public:
explicit atomic_count(long v) : value_(v) {}
void operator++()
{
__atomic_add(&value_, 1);
}
long operator--()
{
return !__exchange_and_add(&value_, -1);
}
operator long() const
{
return __exchange_and_add(&value_, 0);
}
private:
atomic_count(atomic_count const &);
atomic_count & operator=(atomic_count const &);
_Atomic_word value_;
};
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED