AtomicCounter.h

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/*
 * AtomicCounter.h
 *
 * Copyright (C) 2011 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef ATOMICCOUNTER_H_
#define ATOMICCOUNTER_H_

#include "ibrcommon/thread/Conditional.h"

namespace ibrcommon
{
        class AtomicCounter {
        public:
                AtomicCounter(int init = 0);
                virtual ~AtomicCounter();

                int value();
                void wait(int until = 0);

                void unblockAll();

                AtomicCounter& operator++();
                AtomicCounter operator++(int);

                AtomicCounter& operator--();
                AtomicCounter operator--(int);

                class Lock
                {
                public:
                        Lock(AtomicCounter &counter);
                        virtual ~Lock();

                private:
                        AtomicCounter &_counter;
                };

        private:
                ibrcommon::Conditional _lock;
                int _value;
                bool _unblock;

        };
}


#endif /* ATOMICCOUNTER_H_ */