[issue30064] BaseSelectorEventLoop.sock_{recv, sendall}() don't remove their callbacks when canceled

[Fantix King]

Fantix King <fantix.king at gmail.com> added the comment:

Following the discussion - looks like `add_reader()` will cancel the previous `handle` on the same `fd` if found, so I think it is reasonable to solve this cancellation-race issue by checking if the `handle` is cancelled as shown in the attached patch (tests in uvloop passed with this patch). WDTY?

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nosy: +fantix
Added file: https://bugs.python.org/file49146/cancelled-sock-recv-race.patch

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