[issue1583] Patch for signal.set_wakeup_fd

[Jeroen Demeyer]

Jeroen Demeyer <J.Demeyer at UGent.be> added the comment:

> signal-safe is different from thread-safe

I know, but I think that other threads can receive signals too. So in that case, it needs to be signal-safe as well as thread-safe.

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