Re: igc, macOS avoiding signals

[Pip Cet via "Emacs development discussions." <emacs-devel@gnu.org>]

"Eli Zaretskii" <eliz@gnu.org> writes:

>> Date: Sat, 28 Dec 2024 15:12:23 +0000
>> Cc: gerd.moellmann@gmail.com, emacs-devel@gnu.org
>> From:  Pip Cet via "Emacs development discussions." <emacs-devel@gnu.org>
>>
>> I think we probably need to put instrumentation in the source code, so
>> we gain some idea of how long signals are delayed for when we mark them
>> pending.
>
> What do we expect to learn from this,

It tests the current code, which does this:

When a signal arrives, and we can't handle it because we might have
interrupted MPS, we mark the signal as pending in the igc structure.  At
some point later, we check the igc structure for pending signals,
reraise them, and unmask them.

Gerd's experience suggests that the "some point later" happens too late.
This patch gives us measurements.

It's unrelated to the OS scheduler, AFAICS.

Pip