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Showing content from https://mail.python.org/pipermail/python-dev/2006-September/068593.html below:

[Python-Dev] Signals, threads, blocking C functions

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Jean-Paul Calderone wrote:
> PyGTK would presumably implement its pending call callback by writing a
> byte to a pipe which it is also passing to poll().

But doing that in a signal handler context invokes undefined behaviour
according to POSIX.

-- 
David Hopwood <david.nospam.hopwood at blueyonder.co.uk>

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