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

Marko Rauhamaa marko at pacujo.net
Mon Sep 1 00:04:52 CEST 2014

Victor Stinner <victor.stinner at gmail.com>:

But I don't get you point. How does this PEP make the situation worse?

Did I say it would? I just wanted to make sure the system call resumption doesn't become mandatory.

Haven't thought through what the exception raising technique would entail. It might be perfectly ok apart from being a change to the signal handler API.

I don't know issues of signals with select() (and without a file descriptor used to wake up it).

A signal handler often sets a flag, which is inspected when select() returns. The problem is when a signal arrives between testing the flag and calling select(). The pselect() system call allows you to block signals and have the system call unblock them correctly to avoid the race.

Marko

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