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

[STINNER Victor]

STINNER Victor added the comment:

> Sorry, why restrict it to sockets on Windows?
> If someone wants to pass e.g. a pipe, why prevent it?

Pipes cannot be configured in non-blocking mode on Windows. It sounds dangerous to call a blocking syscall in a signal handler.

In fact, it works to write the signal number into a pipe on Windows, but I'm worried about the blocking behaviour.

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