[issue22572] NoneType object is not iterable error when asyncio Server.close() called

[STINNER Victor]

STINNER Victor added the comment:

> Using call_soon_threadsafe from an addCleanup in the _server method makes it work for me. 

Maybe the documentation on thread safety should be improved? More warnings should be put in the documentation?

https://docs.python.org/dev/library/asyncio-dev.html#concurrency-and-multithreading

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<http://bugs.python.org/issue22572>
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