OK Thanks.
I have decided that i whould like to wait until may thread has finished instead of exiting the thread when the user presses Cancel. How can i implement that?

Qt Code: 
  1. //Slot connected to finished signal of the worker class
  2. void a::threadFinished() { 
  3.   m_finished = true;
  4. }
  5.  
  6. void a::cancelPressed() {
  7.   //Here I would like to wait until the thread is finished.
  8.   bool stopWaiting = false;
  9.   while(!stopWaiting) {
  10.     m_mutex.lock();
  11.     if (m_finished)
  12.       stopWaiting = true;
  13.     m_mutex.unlock();
  14.     //How shall I implement the delay (if stopWaiting is false) before i continue another loop in the whileloop without locking the entire program?
  15.   }
  16.  
  17.   //Do som stuff after the thread has finished.
  18.  
  19. }
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