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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Opportunistic GC
Date: Thu, 11 Mar 2021 11:34:22 +0200
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> From: Pip Cet <pipcet@gmail.com>
> Date: Thu, 11 Mar 2021 09:03:23 +0000
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, Andrea Corallo <akrl@sdf.org>, emacs-devel@gnu.org
> 
> > See thread_select.
> 
> I have no intention of calling thread_select.

If you call wait_reading_process_output, or any of its callers (such
as accept-process-output or sleep-for), Emacs _will_ call
thread_select.

> > We don't call pselect directly.
> 
> In this case, we should. I don't see a problem with that, as the child
> Emacs does not need to perform other I/O.

If you want to do that for any of the above-mentioned calls, you will
have to modify the code of wait_reading_process_output.