// 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