def _scan(self):
with closing(select.epoll()) as epoll:
with _monitoring_socket(self._queue, self._groups, epoll) as sock:
with _pipetrick(epoll) as self._pipetrick:
self._scanning_started.set()
while True:
if self._timeout:
timeout = self._end_time - monotonic_time()
# timeout expired
if timeout <= 0:
self._scanning_stopped.set()
self._queue.put(_TIMEOUT_FLAG)
break
else:
timeout = -1
events = NoIntrPoll(epoll.poll, timeout=timeout)
# poll timeouted
if len(events) == 0:
self._scanning_stopped.set()
self._queue.put(_TIMEOUT_FLAG)
break
# stopped by pipetrick
elif (self._pipetrick[0], select.POLLIN) in events:
NoIntrCall(os.read, self._pipetrick[0], 1)
self._queue.put(_STOP_FLAG)
break
_nl_recvmsgs_default(sock)
def _wait_for_events(self):
""" Wait for an epoll event and handle channels' timeout. """
events = NoIntrPoll(self._epoll.poll, 1)
for (fileno, event) in events:
self._handle_event(fileno, event)
else:
self._update_channels()
if (self._timeout is not None) and (self._timeout > 0):
self._handle_timeouts()
self._handle_unconnected()