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

[Charles-François Natali]

Charles-François Natali <neologix at free.fr> added the comment:

> New changeset f8c49a930015 by Victor Stinner in branch 'default':
> Issue #8407: The signal handler writes the signal number as a single byte
> http://hg.python.org/cpython/rev/f8c49a930015

There's a race.
If a signal is received while is_tripped is set, the signal number won't be written to the wakeup FD.
Patch attached.

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Added file: http://bugs.python.org/file22093/sig_wakeup_race.diff

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