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

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of the License "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

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

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

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

    15 // 

    16 //

    17 

    18 #ifndef __DEFRAG_H__

    19 #define __DEFRAG_H__

    20 

    21 /******************************************************************************

    22  * Base class for RAM defragmentation implementation

    23  ******************************************************************************/

    24 

    25 struct SZone;

    26 class DRamAllocator;

    27 /**

    28 @internalComponent

    29 */

    30 class Defrag

    31 	{

    32 public:

    33 	enum TPanic

    34 		{

    35 		EDfcQInitFailed=0,

    36 		};

    37 

    38 public:

    39 	

    40 	// platform independent - defragbase.cpp

    41 	Defrag();

    42 	void Init3(DRamAllocator* aRamAllocator);

    43 	static void DefragTask(TAny* aArg);

    44 private:

    45 	TInt GeneralDefrag(TRamDefragRequest* aRequest);

    46 	TInt ClaimRamZone(TRamDefragRequest* aRequest);

    47 	TInt EmptyRamZone(TRamDefragRequest* aRequest);

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

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

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

    51 	static void Panic(TPanic aPanic);

    52 

    53 	// data

    54 

    55 private:

    56 	TInt iDefragPriority;

    57 	TDfcQue iTaskQ;

    58 	DRamAllocator* iRamAllocator;

    59 

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

    61 

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

    63 	};

    64 

    65 #endif