1 // Copyright (c) 2008-2009 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 //

    15 

    16 

    17 

    18 /**

    19  @file

    20  @internalComponent

    21 */

    22 

    23 #ifndef MTHRASH_H

    24 #define MTHRASH_H

    25 

    26 class DThrashMonitor

    27 	{

    28 public:

    29 	

    30 	DThrashMonitor();

    31 	void Start();

    32 	TInt ThrashLevel();

    33 	TInt SetThresholds(TUint thrashing, TUint good);

    34 

    35 	void NotifyStartPaging();  			// The current thread has started a paging operation

    36 	void NotifyEndPaging();    			// The current thread has completed a paging operation

    37 

    38 private:

    39 

    40 	enum TCount

    41 		{

    42 		ECountThreadsPaging,

    43 		EMaxCount

    44 		};

    45 

    46 	struct TCountData

    47 		{

    48 		TInt iCount;					// Current value of counter

    49 		TUint32 iLastUpdateTime;		// Time counter was last updated

    50 		TInt64 iTotal;					// Accumulator for ticks * value

    51 		TInt iAverage;					// Average value of counter for last time period * 100

    52 		};

    53 

    54 private: 

    55 

    56 	void UpdateCount(TCount aCount, TInt aDelta);	

    57 	void RecalculateThrashLevel();		// Update internal state, called periodically from timer DFC

    58 	static void UpdateDfcFunc(TAny* aPtr);

    59 

    60 private:

    61 

    62 	TBool iRunning;

    63 	NTimer iUpdateTimer;

    64 	TDfc iUpdateDfc;

    65 	TUint32 iLastUpdateTime;

    66 	NFastMutex iMutex;

    67 

    68 	TInt iThrashLevel;

    69 	TBool iIsThrashing;

    70 	TInt iThresholdThrashing;

    71 	TInt iThresholdGood;

    72 

    73 	TCountData iCount[EMaxCount];

    74 	};

    75 

    76 extern DThrashMonitor TheThrashMonitor;

    77 

    78 #endif