Re: Emacs without threads

[Eli Zaretskii <eliz@gnu.org>]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: emacs-devel@gnu.org
> Date: Thu, 14 Dec 2023 15:12:31 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > The threads you see under a debugger are not Lisp threads, they are
> > threads started by GTK and other libraries we link against.  You
> > cannot disable them, except by building Emacs without those libraries
> > (I think just without GTK should do, if you are on GNU/Linux).
> 
> I'm not using GTK so maybe it is another library (maybe librsvg-2).

Look at the code those threads run (e.g., with "thread apply all bt"),
and you will know which library does that.

> >> (FWIW, I want this to simplify debugging because on my machine I cannot
> >> make GDB to switch to the correct thread
> >
> > How come?
> 
> I don't know so I will just describe the symptoms: when I "run" Emacs
> into a 'M-x gdb' session at one point the *gud* buffer will output [New
> thread ...] and then the Emacs process is stuck and so is the process of
> the *gud* buffer.  So I have to kill and close everything.

Never seen anything like that.  Any chance of describing under what
conditions this happens?  Is this 100% reproducible on your system?

> (FWIW, GDB on OpenBSD does not seem to support non-stop mode.  Maybe it
> is what is required.)

No, you don't need the non-stop mode to debug Emacs.  You need the
all-stop mode, which is supposed to be the default.

What version of GDB do you have there?