[issue21595] asyncio: Creating many subprocess generates lots of internal BlockingIOError

[STINNER Victor]

STINNER Victor added the comment:

asyncio_read_from_self_test.patch: Unit test to check that running the loop once reads all bytes. The unit test is ugly: it calls private methods, and it is completly different on UNIX (selector) and on Windows (proactor).

I would prefer to *not* add such test, and just enhance the code (apply  asyncio_read_from_self.patch).

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Added file: http://bugs.python.org/file35495/asyncio_read_from_self_test.patch

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