booster/atomic_counter.h

//
//  Copyright (C) 2009-2012 Artyom Beilis (Tonkikh)
//
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOSTER_ATOMIC_COUNT_H
#define BOOSTER_ATOMIC_COUNT_H

#include <booster/config.h>


namespace booster {


        class BOOSTER_API atomic_counter {
        public:
                explicit atomic_counter( long v );
                ~atomic_counter();

                long operator++()
                {
                        return inc();
                }
                long operator--()
                {
                        return dec();
                }
                operator long() const 
                {
                        return get();
                }
        private:
                long inc();
                long dec();
                long get() const;

                atomic_counter(atomic_counter const &);
                atomic_counter & operator=(atomic_counter const &);

                mutable union {
                        int i;
                        unsigned ui;
                        long l;
                        unsigned long ul;
                        long long ll;
                        unsigned long long ull;
                } value_;
                // Is actually used for platforms without lock
                // it would not be used when atomic operations
                // available
                void *mutex_;
        };

} // booster

#endif