bug#17237: 24.3.50; Hang with X11 + emacsclient

[Jan Djärv]

Hello.

2014-04-11 02:48, Aaron Ecay skrev:
> I observe strange hangs when using org-protocol via emacsclient, under
> X11.  Recipe to reproduce:
>
> 1. emacs -Q (recent trunk version; I’ve been seeing the bug for several
>     weeks if not longer)
> 2. M-x server-start
> 3. touch ~/test
>
> If I invoke the following command from a shell on the same X11 virtual
> desktop as emacs, it works fine:
>
> emacsclient ~/test
>
> However, if I invoke the same command from a terminal on another
> desktop, the CPU usage spikes of both emacs (to ~50%) and the X server
> process (to ~85%), as visible in top.  emacsclient prints "Waiting for
> Emacs..." to the terminal, and does not exit.

XMonad does not make the Emacs frame visible, so Emacs gets stuck in an 
endless loop.  Many other wm:s change the desktop to the desktop where Emacs 
is, but XMonad does not.
Possible we could force that with some EWMH-hints, but the XMonad 
documentation suggests that a user may configure XMonad to ignore those anyway.

Se the best we can do is to prevent the endless loop.  I have checked in a fix 
in the emacs-24 branch.

        Jan D.