bug#19776: 25.0.50; HTML rendering is very slow

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Lars Ingebrigtsen <larsi@gnus.org>,  dmantipov@yandex.ru,
>   stefan@marxist.se,  19776@debbugs.gnu.org,  rms@gnu.org,
>   monnier@iro.umontreal.ca
> Date: Mon, 25 Oct 2021 19:11:03 +0200
> 
> On Okt 25 2021, Eli Zaretskii wrote:
> 
> > Also, if we are stuck in pselect call with a long timeout, we won't
> > get around to calling maybe_quit or process_pending_signals, right?
> 
> pselect will return as soon as input is available.

I mean without timerfd, and if there's no input.