code: def active_io(self, iocb):
          
          if _debug: IOQController._debug("active_io %r", iocb)
  
          # base class work first, setting iocb state and timer data
          IOController.active_io(self, iocb)
  
          # change our state
          self.state = CTRL_ACTIVE
          _statelog.debug("%s %s %s" % (_strftime(), self.name, "active"))
  
          # keep track of the iocb
          self.active_iocb = iocb
docs: Called by a handler to notify the controller that a request is
          being processed.