cxSharedMemory.h

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.
                 
Copyright (c) SINTEF Department of Medical Technology.
All rights reserved.
                 
CustusX is released under a BSD 3-Clause license.
                 
See Lisence.txt (https://github.com/SINTEFMedtek/CustusX/blob/master/License.txt) for details.
=========================================================================*/

#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