[issue22018] Add a new signal.set_wakeup_socket() function

[STINNER Victor]

STINNER Victor added the comment:

> Does you have an idea if set_wakeup_fd() is used on Windows? It's not possible to use it with select.select() because on Windows this function only accepts sockets. I don't know if it's possible to watch a pipe using IOCP. Is set_wakeup_fd() used by Twisted, Tornado or another project on Windows?

I checked Twisted: signal.set_wakeup_fd() is only used on POSIX, as
expected (since it doesn't work with select on Windows). But Twisted
sets a signal handler for SIGINT, SIGTERM and SIGBREAK.

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<http://bugs.python.org/issue22018>
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