Antoine Pitrou <pit...@free.fr> added the comment:

> The spec broken is here:
> 
> http://docs.python.org/library/signal.html

I would argue it is not broken. This documentation page is about a
module of the standard library, it doesn't specify the underlying C
implementation. That "the main thread will be the only one to receive
signals" is true if you consider it from the Python code's point of
view: signal handlers are always called in the main thread, even if the
OS-level signal was delivered to (and caught by) another thread.

I don't have any strong view over whether the interpreter should,
theoretically, block signals in non-main threads. But, practically,
blocking signals apparently produced issues with readline (and possibly
other libs relying on signals), which is why they are not blocked today.

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<http://bugs.python.org/issue1975>
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