[issue26371] asynchat.async_chat and asyncore.dispatcher_with_send are not thread-safe

[STINNER Victor]

STINNER Victor added the comment:

asynchat is now deprecated in favor of asyncio.

Almost all asyncio functions are not thread-safe, it's now well documented, see the general info:
https://docs.python.org/dev/library/asyncio-dev.html#concurrency-and-multithreading

If we do something, I suggest to only touch asynchat doc to explain well that asyncore and asynchat are not thread-safe.

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components: +asyncio
nosy: +gvanrossum, haypo, yselivanov

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<http://bugs.python.org/issue26371>
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