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bug#24756: 26.0.50; Emacs should not use pselect


From: Philipp Stephani
Subject: bug#24756: 26.0.50; Emacs should not use pselect
Date: Tue, 25 Oct 2016 11:45:22 +0000



Philipp Stephani <p.stephani2@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). 

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