[Python-Dev] RFC: PEP 475, Retry system calls failing with EINTR
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
> 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
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