cxSharedMemory.h

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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modification, are permitted provided that the following conditions are met:

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   this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, 
   this list of conditions and the following disclaimer in the documentation 
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors 
   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
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=========================================================================*/

#ifndef CXSHAREDMEMORY_H_
#define CXSHAREDMEMORY_H_

#include "cxResourceExport.h"

#include <QSharedMemory>
#include <QDateTime>

namespace cx
{


class cxResource_EXPORT SharedMemoryServer
{
private:
        QSharedMemory mBuffer;
        int mSize;
        int mBuffers;
        int mCurrentBuffer;
        QDateTime mLastTimestamp;

public:
        SharedMemoryServer(QString key, int buffers, int sizeEach, QObject *parent = 0);
        ~SharedMemoryServer();
        int size() { return mSize; }
        int buffers() { return mBuffers; }
        QString key() { return mBuffer.key(); }
        void *buffer();         
        void release();         

        QDateTime lastTimestamp() { return mLastTimestamp; }
        bool hasBuffer() { return mCurrentBuffer != -1; }
private:
        void internalRelease(bool lock);
};

class cxResource_EXPORT SharedMemoryClient
{
private:
        QSharedMemory mBuffer;
        int mSize;
        int mBuffers;
        int mCurrentBuffer;
        QDateTime mTimestamp; 

public:
        SharedMemoryClient(QObject *parent = 0);
        ~SharedMemoryClient();
        bool attach(const QString &key);
        bool detach();
        int size() { return mSize; }
        int buffers() { return mBuffers; }
        QString key() { return mBuffer.key(); }
        const void *buffer(bool onlyNew=false);         
        void release();                 
        const void *isNew();            
        QDateTime timestamp() { return mTimestamp; }
};

}

#endif