Re: igc, macOS avoiding signals

[Eli Zaretskii]

> Date: Tue, 31 Dec 2024 13:49:05 +0000
> From: Pip Cet <pipcet@protonmail.com>
> Cc: Gerd Möllmann <gerd.moellmann@gmail.com>, Eli Zaretskii <eliz@gnu.org>, 
> spd@toadstyle.org, emacs-devel@gnu.org
> 
> Alternatively, let's all switch to FreeDOS!  No memory barriers, no
> signals

That's not true: DJGPP (which is the only way to compile Emacs on DOS)
supports signals.  SIGSEGV certainly, but also SIGPROF and SIGALRM,
AFAIR.

> (It's true that most DOS "extenders" appear to use the MMU, and that
> might make it sound like mprotect() could simply involve walking the
> (unprotected) page tables; but my understanding is it's 4MB pages, which
> is inconvenient for us).

The only relevant DOS extenders for Emacs are DPMI hosts, cwsdpmi
being the first and the most obvious candidate.  cwsdpmi supports
mprotect.

But we digress.