bug#13540: 24.3.50; Regression in trunk: auto-revert-mode fails on files accessed via samba

[Dani Moncayo <dmoncayo@gmail.com>]

> Each time you evaluate the expression that calls w32notify-add-watch,
> you should see another "New Thread" announcement.

Yes I do.

> This is normal,
> since each watch you add starts a new thread where the watching code
> runs.

Ok.

> Can you use Process Explorer or "pslist -d emacs" (both tools are from
> the Sysinternals package) to see if the threads started when you
> invoke w32notify-add-watch keep running, or die/exit?

I observe (with process explorer) that the new threads keep running.

> The lack of any messages suggests that the threads continue to run,
> but file notifications never come in, which probably means we cannot
> detect this problem automatically, and must rely on the users who know
> which volumes can and cannot be supported.

Ok, if Emacs cannot determine itself whether file notifications work,
I'll set `auto-revert-use-notify' to nil on that machine.

> Also, I presume that you tried to modify files on the mounted volumes,
> while you had GDB attached to Emacs.

Of course.  I started and "emacs -Q" process under GDB, and from that
emacs session I visited the file on the mounted volume and turned on
auto-revert-mode.  Then, if I modify the file with another program,
the emacs buffer isn't reverted and the GDB console doesn't show any
message.

-- 
Dani Moncayo