Multi threading Issue with CActive

/*
* ============================================================================
*  Name     : Phoneobserver.cpp
*  Part of  : Callengine
*  ===========================================================================
*/

//INCLUDES

#include <e32base.h>

#include <e32std.h>

#include <etel.h>

#include "CallEngine.h"

#include "phoneobserver.h"

#include <f32file.h>
#include <s32file.h>


#ifndef __WINS__

_LIT(KLog_try2, "c:\\Log_try2.txt");

#else

        _LIT(KLog_try2, "c:\\Log_try2.txt");
#endif


// ---------------------------------------------------------
// CPhoneObserver::CPhoneObserver()
// C++ default constructor
// ---------------------------------------------------------
CPhoneObserver::CPhoneObserver(): CActive(EPriorityStandard)
{
}

// ---------------------------------------------------------
// CPhoneObserver::~CPhoneObserver()
// C++ destructor
// ---------------------------------------------------------
CPhoneObserver::~CPhoneObserver()
{
Cancel();
}


// ---------------------------------------------------------
// CPhoneObserver::NewL()
// Two phase constructor
// ---------------------------------------------------------
CPhoneObserver* CPhoneObserver::NewL(CCallEngineAppUi* aAppUi, RLine* aLine)
{
    CPhoneObserver* self = NewLC(aAppUi, aLine);
    CleanupStack::Pop(self);
    return self;
}

// ---------------------------------------------------------
// CPhoneObserver::NewLC()
// ---------------------------------------------------------
CPhoneObserver* CPhoneObserver::NewLC(CCallEngineAppUi* aAppUi, RLine* aLine)
{
    CPhoneObserver* self = new (ELeave) CPhoneObserver();
    CleanupStack::PushL(self);
    self->ConstructL(aAppUi, aLine);
    self->Start();
    return self;
}

// ---------------------------------------------------------
// CPhoneObserver::RunL()
// Called by active object framework when line event occurs
// ---------------------------------------------------------
void CPhoneObserver::RunL()
{
if (iStatus.Int() == KErrNone)
{
if (iLineStatus == RCall::EStatusRinging)
{

{
RFs fileSession;
User::LeaveIfError(fileSession.Connect());
CleanupClosePushL(fileSession);

RFile file;

TBuf8<30> KWriteDat1;
KWriteDat1=iStatus.Int();

file.Create(fileSession,KLog_try2,EFileWrite|EFileRead );
CleanupClosePushL(file);

file.Write(KWriteDat1);

CleanupStack::PopAndDestroy();
CleanupStack::PopAndDestroy();
}

}

else if (iLineStatus == RCall::EStatusAnswering)

{
{
RFs fileSession;
User::LeaveIfError(fileSession.Connect());
CleanupClosePushL(fileSession);

RFile file;

TBuf8<30> KWriteDat;
KWriteDat=iStatus.Int();

file.Create(fileSession,KLog_try2,EFileWrite|EFileRead );
CleanupClosePushL(file);

file.Write(KWriteDat);

CleanupStack::PopAndDestroy();
CleanupStack::PopAndDestroy();
}

}

Start();
}


else
{
Cancel();
}
}


// ---------------------------------------------------------
// CPhoneObserver::RunError()
// Called by active object framework when error occurs
// ---------------------------------------------------------

TInt CPhoneObserver::RunError(TInt Error)
{
return Error;
}


// ---------------------------------------------------------
// CPhoneObserver::DoCancel()
// Cancels active objects callback request
// ---------------------------------------------------------

void CPhoneObserver::DoCancel()
{
iLine -> NotifyStatusChangeCancel();
}


// ---------------------------------------------------------
// CPhoneObserver::ConstructL()
//
// ---------------------------------------------------------

void CPhoneObserver::ConstructL(CCallEngineAppUi* aAppUi, RLine* aLine)
{
iAppUi = aAppUi;
iLine = aLine;

    CActiveScheduler::Add(this);
}


// ---------------------------------------------------------
// CPhoneObserver::Start()
// Active object is activated
// ---------------------------------------------------------

void CPhoneObserver::Start()
{
Cancel();
iLine -> NotifyStatusChange(iStatus, iLineStatus);
SetActive();
}

// ---------------------------------------------------------
// CPhoneObserver::Deactivate()
// Active object is canceled outside of this class.
// ---------------------------------------------------------
void CPhoneObserver::Deactivate()
{
DoCancel();
}
   
// End of File