[issue30014] Speedup DefaultSelectors.modify() by 1.5x

[STINNER Victor]

STINNER Victor added the comment:

> Doesn't that mean doing 3 operations (unregister(), register(), modify()) instead of the current 2 (unregister(), register())? I don't see how it can be faster than a single modify() syscall.

The idea is to reuse _BaseSelectorImpl.register() and _BaseSelectorImpl.unregister() to factorize the code. These methods don't use syscall, they create the SelectorKey object and update _fd_to_key. So each class doesn't have to redo these things.

I don't insist to redo what I did, I'm just trying to explain my change because your change basically copy/paste the same code 3 times, and you forgot KqueueSelector, so you even may have to copy it a 4th time ;-)

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<http://bugs.python.org/issue30014>
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