GNU bug report logs - #24756
26.0.50; Emacs should not use pselect

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Message #13 received at 24756-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 24756-done <at> debbugs.gnu.org
Subject: Re: bug#24756: 26.0.50; Emacs should not use pselect
Date: Sun, 29 Sep 2019 06:02:56 +0200

Philipp Stephani <p.stephani2 <at> gmail.com> writes:

> Philipp Stephani <p.stephani2 <at> gmail.com> schrieb am Fr., 21. Okt. 2016 um 17:42 Uhr:
>
>  Emacs uses pselect for IO multiplexing, limiting the number of available
>  file descriptors to FD_SETSIZE.  Rather, epoll/kqueue should be used, if
>  available.
>
> Some good counter-arguments were brought up:
> - pselect is in the POSIX standard, whereas the possible replacements (ppoll/epoll/kqueue) are not.
> - The file descriptor limit should only be hit in pathological cases, e.g. when leaking background processes, and is only a symptom of a bug somewhere else. A higher FD limit would only hide the symptom, but not fix the underlying root cause.
>
> Given that, I'm no longer convinced that switching away from pselect would be a good idea (but I'll leave this bug open for now to provide a space for discussion).

That was three years ago, and no such discussion has taken place here.
If there is a continued need to discuss this, perhaps it's better to
take it to emacs-devel.  I'm therefore closing this bug report.

If anyone disagrees, they should feel free to reopen.

Best regards,
Stefan Kangas

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