code: def start_monitoring(seconds_frozen=SECONDS_FROZEN,
                       test_interval=TEST_INTERVAL):
      
      
      thread = StoppableThread(target=monitor, args=(seconds_frozen,
                                                     test_interval))
      thread.daemon = True
      thread.start()
      return thread
docs: Start monitoring for hanging threads.
  
      seconds_frozen - How much time should thread hang to activate
      printing stack trace - default(10)
  
      tests_interval - Sleep time of monitoring thread (in milliseconds) 
      - default(100)