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NotImplementedError on Windows #86

@oyarsa

Description

@oyarsa

I tried running the example code on the README, and got this error:

From cffi callback <function _sock_state_cb at 0x00000240DB1BEC10>:
Traceback (most recent call last):
  File "C:\Users\italo\Google Drive\Code\Projects\email-lists\env\lib\site-packages\pycares\__init__.py", line 91, in _sock_state_cb
    sock_state_cb(socket_fd, readable, writable)
  File "C:\Users\italo\Google Drive\Code\Projects\email-lists\env\lib\site-packages\aiodns\__init__.py", line 104, in _sock_state_cb
    self.loop.add_reader(fd, self._handle_event, fd, READ)
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\events.py", line 501, in add_reader
    raise NotImplementedError
NotImplementedError

The program hung after that. After interrupting it, this is the traceback:

Traceback (most recent call last):
  File "a.py", line 11, in <module>
    result = loop.run_until_complete(coro)
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 603, in run_until_complete
    self.run_forever()
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\windows_events.py", line 316, in run_forever
    super().run_forever()
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 570, in run_forever
    self._run_once()
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\base_events.py", line 1823, in _run_once
    event_list = self._selector.select(timeout)
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\windows_events.py", line 430, in select
    self._poll(timeout)
  File "C:\Users\italo\AppData\Local\Programs\Python\Python38\lib\asyncio\windows_events.py", line 779, in _poll
    status = _overlapped.GetQueuedCompletionStatus(self._iocp, ms)
KeyboardInterrupt

This is on Windows 10 build 2004 with Python 3.8.5 and aiodns 2.0.0.

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