[issue8407] expose signalfd(2) and pthread_sigmask in the signal module

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

pending_signals.patch: add pthread_kill(), sigpending() and sigwait() functions with doc and tests.

I added many "See also" in the doc, e.g. os.kill() gives a link to signal.pthread_kill().

Note: the patch renames also BasicSignalTests to PosixTests, it's not related to the other changes.

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Added file: http://bugs.python.org/file21883/pending_signals.patch

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