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

Victor Stinner victor.stinner at gmail.com
Tue Sep 2 23:35:28 CEST 2014

2014-09-02 23:02 GMT+02:00 Matthew Woodcraft <matthew at woodcraft.me.uk>:

I think people who use sleep() in their programs could benefit from not having to worry about EINTR as much as anyone else.

The behaviour of time.sleep() is worse than what I expected. On UNIX, if select() fails with EINTR, time.sleep() calls PyErr_CheckSignals(). If the signal handler doesn't raise an exception, time.sleep() returns None and just simply ignores the error.

But on Windows, it's the opposite. If time.sleep() is interrupt by CTRL+c, time.sleep() raises an InterruptedError...

Good luck to write portable code :-p

With the PEP 475, time.sleep(secs) now has a well defined behaviour. It sleeps at least "secs" seconds, retry the syscall on EINTR, and raises an exception if the signal handler raises an exception.

Victor

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