To exit the application gracefully

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MFC

Hi All..

Am struck up in certain situation, Let me explain this.. My snippet code looks like this.

//CSampleDlg.cpp

void CALLBACK EXPORT MyTimerProc(HWND hWnd,UINT nMsg,UINT nIDEvent,DWORD dwTime)
{
   // Task 1: Am reading the values SellA,BuyB & SellB,BuyA.
   
   //Task 2: 
   if( SellA >= BuyB)
   {
      //Do Other Stuff: Open_Position() operation
   }

   if( SellB >= BuyA )
   {
      //Do other stuff: Close_Position() Operation
   }

}

I have to run MyTimerProc function continuously.After certain hours i have to quit that function.

UINT m_timer;
void CSampleDlg::OnOK()
{
//For Every 2seconds, MyTimerProc will run continously.
 m_timer=SetTimer(1, 2000, (TIMERPROC)MyTimerProc);
}

void CSampleDlg::OnCancel()
{
//To Terminate the MyTimerProc function
KillTimer(m_timer);
}

When i click on cancel button, Anyhow MyTimerProc function will quit. But My fear is.. When i click on cancel button & control is in the middle operation like Open_Position() OR Close_Position(). In such case, Open_Position() OR Close_Operation() will fail & application will not exit gracefully.

Is it possible, when user clicks on cancel button & if MyTimerProc function is doing Open_Position()/Close_position(), then can i get the any notifiction or just like alarm..
Please suggest me on this..

Thank you all.