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

[STINNER Victor]

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

signal_pthread_sigmask.patch:
 - add signal.pthread_sigmask() function with doc and tests
 - add SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK constants
 - fix #11859: fix tests of test_io using threads and an alarm: use pthread_sigmask() to ensure that only the main thread receives the SIGALRM signal

The code is based on the last version of python-signalfd:
https://code.launchpad.net/~exarkun/python-signalfd/trunk

Changes between python-signalfd and my patch:
 - rename "sigprocmask" function to "pthread_sigmask"
 - I added an unit test and the doc
 - catch PyIter_Next() error
 - set signum variable (the result of PyLong_AsLong) type to long (instead of int) and check its value (0 < signum < NSIG)
 - I adapted the code to my coding style :-)

I will work on a similar patch for signalfd() after the pthread_sigmask() patch is accepted.

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keywords: +patch
Added file: http://bugs.python.org/file21735/signal_pthread_sigmask.patch

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