/*

* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Declaration of CMmapMemoryNode

*

*/

#ifndef MMAP_MEMORY_NODE_H

#define MMAP_MEMORY_NODE_H

//  INCLUDES

#include <e32base.h>

#include <e32std.h>

#include "mmap.h"

#include "base.h"

// CONSTANTS

// MACROS

// FORWARD DECLARATIONS

class CMmapMemoryNode;

// DATA TYPES

// FUNCTION PROTOTYPES

// CLASS DECLARATION

/*

*  This class is responsible to managing mapped memory nodes.  

*/

NONSHARABLE_CLASS ( CMmapMemoryNode ): public BBase

    {

public:

    /*

    * constructor.

 	*/

    static CMmapMemoryNode * NewL(size_t len, int flag, int shmflg, \

    							  int fildes, off_t offset, int& anErrno, size_t maplen);

    /*

    * Default destructor.

    */

    ~CMmapMemoryNode();

    /*

    * Description:Give message length

    * return:Message length

    */

    size_t MapLength();

    /*

    * Description:Give message type

    * return: message type

    */

    off_t MapFileOffset();

    /*

    * Determine memory data member link offset for single queue

    */

    static TInt LinkOffset();

    /*

    * Get the file mapped memory address

    */

    TAny* MappedAddress();

    /*

    * Get the file mapped memory info

    */

    struct MappedMemory GetMemInfo();

    /*

    * Set the file descriptor base address

    */

    void SetFdescAddress(void* aAddr);

    /*

    * Sync mapped memory to file

    */

    int SyncMemory(int len, int flags, int& anErrno);

private:

    /*

    * Default constructor.

    */

    CMmapMemoryNode();        

    /*

    * 2nd phase constructor.

    */

    int ConstructL(size_t len, int flag, int shmflg, int fildes, \

    				off_t offset, int& anErrno, size_t maplen);

private: // data

    struct MappedMemory iMapMem;

    TSglQueLink iLink;

    };

#endif // MMAP_MEMORY_NODE_H

// End of File