[issue16853] add a Selector to the select module

[Antoine Pitrou]

Antoine Pitrou added the comment:

> All the event loops I'm familiar with (twisted, tornado and asyncore)
> just 'return' on EINTR, supposedly because that was the best
> compromise to support syscall interruption without forcing users to
> handle EINTR themselves.

What do you mean? Tornado simply retries on EINTR:
https://github.com/facebook/tornado/blob/master/tornado/ioloop.py#L652

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<http://bugs.python.org/issue16853>
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