D4RQueue.h

Go to the documentation of this file.

//=============================================================================
//  Computational Process Networks class library
//  Copyright (C) 1997-2006  Gregory E. Allen and The University of Texas
//
//  This library is free software; you can redistribute it and/or modify it
//  under the terms of the GNU Library General Public License as published
//  by the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Library General Public License for more details.
//
//  The GNU Public License is available in the file LICENSE, or you
//  can write to the Free Software Foundation, Inc., 59 Temple Place -
//  Suite 330, Boston, MA 02111-1307, USA, or you can find it on the
//  World Wide Web at http://www.fsf.org.
//=============================================================================
#ifndef D4R_QUEUE_H
#define D4R_QUEUE_H
#pragma once
#include <cpn/common.h>
#include <tr1/memory>
namespace D4R {

    using std::tr1::shared_ptr;

    class Node;

    class QueueBase {
    public:
        QueueBase();
        virtual ~QueueBase();

        void SetReaderNode(shared_ptr<Node> n);
        void SetWriterNode(shared_ptr<Node> n);

    protected:
        void ReadBlock();

        void WriteBlock(unsigned qsize);

        virtual bool ReadBlocked() = 0;
        virtual bool WriteBlocked() = 0;

        virtual void Detect() = 0;

    public:
        virtual void Lock() const = 0;
        virtual void Unlock() const = 0;
        void SignalReaderTagChanged();
        void SignalWriterTagChanged();
    private:
        QueueBase(const QueueBase&);
        QueueBase &operator=(const QueueBase&);

    protected:
        virtual void UnlockedSignalReaderTagChanged();
        virtual void UnlockedSignalWriterTagChanged();
        virtual void Wait() = 0;
        virtual void Signal() = 0;

        shared_ptr<Node> reader;
        shared_ptr<Node> writer;
        bool readtagchanged;
        bool writetagchanged;
        bool incomm;
    };

}
#endif