[issue21822] KeyboardInterrupt during Thread.join hangs that Thread

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

multiprocessing semaphores support Ctrl-C under Windows, so it should be doable for regular locks as well (notice the `sigint_event`):
https://github.com/python/cpython/blob/master/Modules/_multiprocessing/semaphore.c#L109-L146

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<https://bugs.python.org/issue21822>
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