[Python-Dev] RFC: PEP 475, Retry system calls failing with EINTR (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Tue Sep 2 16:48:00 CEST 2014

On Mon, 1 Sep 2014 21:17:33 +0000 (UTC) Matthew Woodcraft <matthew at woodcraft.me.uk> wrote:

> If such applications exist, they are not portable and are subject to > race conditions (deadlock if the signal comes before the system call). The program is certainly not portable (which is not any kind of a problem), and as pselect is unavailable there is indeed the usual theoretical race (which has not been a problem in practice in the ten years it's been running). (The program handles SIGTERM so that it can do a bit of cleanup before exiting, and it uses the signal-handler-sets-a-flag technique. The call that might be interrupted is sleep(), so the program doesn't strictly rely on the existing behaviour; it would just become very slow to exit.)

So, if it's just for process exit, just let the signal handler raise an exception and catch the exception at the top-level.

Regards

Antoine.

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