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 "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 // UTrace Performance Tests Kernel-Side Timer.

    15 //

    16 

    17 

    18 

    19 /**

    20  @file te_uptkerneltimer.h

    21  @internalTechnology

    22  @prototype

    23 */

    24 

    25 #ifndef TE_UPTKERNELTIMER_H_

    26 #define TE_UPTKERNELTIMER_H_

    27 	

    28 #include <kern_priv.h>

    29 #include <kernel.h>

    30 #include <platform.h>

    31 

    32 class TKernelTimer

    33 {

    34 public:

    35 	TKernelTimer();

    36 	~TKernelTimer();

    37 	TInt 	StartBackgroundTimer();

    38 	TUint32 FinalTime();

    39 	TBool	IsTimerExpired(){return iTimerExpired;};

    40 	void	IncreaseCount(){iCount++;};

    41 	TUint32	FinalCount(){return iFinalCount;};

    42 	/**

    43 	 * This is used by the NTimer when the timer expires.

    44 	 */

    45      static void FinishTiming(TKernelTimer* aSelf);

    46 private:

    47 	void 	WaitForNextTick();

    48 private:

    49 	//This is all about the timer and timing a trace call... 

    50 	//should refactor into its own class, but it's so small so far it doesnt matter too much 

    51 	//This is used to set up a timer such that we can measure how long a trace call takes

    52     NTimer 			iTimer;

    53     //For the timer to work we need a volatile member that we can change the status of when the timer has expired

    54     volatile TBool	iTimerExpired;

    55     //We count how many times we could make a call to trace before the timer expires

    56  	volatile TUint32 	iCount;

    57  	//Because the iCount can be increased before we knew that the timer had expired we make sure

    58  	//that we keep the last iCount as it was when the timer expired. So iFinalCount has the

    59  	//exact count and iCount may have the corect count or may have been increased while the timer expired.

    60  	TUint32			iFinalCount;

    61 };

    62 

    63 

    64 

    65 #endif /*TE_UPTKERNELTIMER_H_*/

    66 

    67