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

[Antoine Pitrou]

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

> pending_signals-3.patch:
>  - don't check for pending signals in sigwait()
>  - pthread_kill() doc: it is not a good idea to say that pthread_kill() with signum=0 can be used to check if a thread identifier is valid => such test does crash (SIGSEGV) on my Linux box. I changed the doc to say that it can be used to check if a thread is still running (which is different).
>  - add a dedicated test for sigpending()
>  - doc: explain how to get a thread identifier for pthread_kill()
>  - don't compile pthread_kill() without threads: you cannot get a valid thread identifier without the _thread module
> 
> I think that the patch is ready to be commited. Anyone for a last
> review? (antoine, neologix?)

It looks good to me.
It's very nice to have all these extra functions :)

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<http://bugs.python.org/issue8407>
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