// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "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:

// e32\include\memmodel\epoc\mmubase\defrag.h

// 

//

#ifndef __DEFRAG_H__

#define __DEFRAG_H__

/******************************************************************************

 * Base class for RAM defragmentation implementation

 ******************************************************************************/

struct SZone;

class DRamAllocator;

/**

@internalComponent

*/

class Defrag

	{

public:

	enum TPanic

		{

		EDfcQInitFailed=0,

		};

public:

	// platform independent - defragbase.cpp

	Defrag();

	void Init3(DRamAllocator* aRamAllocator);

	static void DefragTask(TAny* aArg);

private:

	TInt GeneralDefrag(TRamDefragRequest* aRequest);

	TInt ClaimRamZone(TRamDefragRequest* aRequest);

	TInt EmptyRamZone(TRamDefragRequest* aRequest);

	TInt ClearZone(SZone& aZone, TUint aMaxRetries, TRamDefragRequest* aRequest);

	TInt ClearMovableFromZone(SZone& aZone, TBool aBestEffort, TRamDefragRequest* aRequest);

	TInt ClearDiscardableFromZone(SZone& aZone, TBool aBestEffort, TRamDefragRequest* aRequest, TUint* aMaxDiscard=NULL);

	static void Panic(TPanic aPanic);

	// data

private:

	TInt iDefragPriority;

	TDfcQue iTaskQ;

	DRamAllocator* iRamAllocator;

	static Defrag* TheDefrag; // single instance of the defragmentor

	friend class TRamDefragRequest;	// This needs access to iDefragPriority and iTaskQ

	};

#endif