bug#34059: 27.0.50; Emacs hangs on typing quit (MS-Windows)

[Richard Copley <rcopley@gmail.com>]

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On Mon, 14 Jan 2019, 15:40 Eli Zaretskii <eliz@gnu.org wrote:

> > From: Richard Copley <rcopley@gmail.com>
> > Date: Sun, 13 Jan 2019 16:00:23 +0000
> > Cc: 34059@debbugs.gnu.org
> >
> > On Sun, 13 Jan 2019 at 15:17, Eli Zaretskii <eliz@gnu.org> wrote:
> > >
> > > > From: Richard Copley <rcopley@gmail.com>
> > > > Date: Sun, 13 Jan 2019 13:04:05 +0000
> > > >
> > > > Emacs sometimes hangs on typing quit, on MS-Windows.
> > >
> > > Thanks, but if you can, please provide more details about what was
> > > Emacs doing when this happens.
> >
> > I'm not sure exactly, sorry. I would have been reading console output
> > from a process in a compilation-mode buffer, and using git via magit,
> > around the time.
>
> Any chance you could recollect why did you type C-g while at that?
>

Not really. I had invoked M-x recompile, and didn't immediately see
results in the compilation-mode buffer. That's not a compelling reason
to type C-g so I suppose I had done something else too.

The file I was editing/compiling wasn't saved (I recovered it from a
stale autosave later). I don't remember whether I saw the "Save file
%s? (...)" question, nor whether I had answered it if so. (I mention
this in case it's a useful clue. Probably not.)

> The message says "I'll send another report if and when I catch another
hang".

>
> I've found one, possibly two more places where we could QUIT while
> holding a critical section.  I cannot know if they were part of your
> hang, but I went ahead and fixed them on the emacs-26 branch.  Let's
> see if they stop these hangs from happening.
>

Great, thanks. Let's see.

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