161             self.LastRefreshTimer = Timer(REFRESH_PERIOD, self._timer_expired)

   161             self.LastRefreshTimer = Timer(REFRESH_PERIOD, self._timer_expired)

   162             self.LastRefreshTimer.start()

   162             self.LastRefreshTimer.start()

   163             self.TimerAccessLock.release()

   163             self.TimerAccessLock.release()

   164 

   164 

   165     def _should_write(self):

   165     def _should_write(self):

   167         if MainThread == currentThread().ident:

   170         if MainThread == currentThread().ident:

   169             if app is not None:

   171             if app is not None:

   170                 if self.YieldLock.acquire(0):

   172                 if self.YieldLock.acquire(0):

   171                     app.Yield()

   173                     app.Yield()

   172                     self.YieldLock.release()

   174                     self.YieldLock.release()

   173 

   175