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bug#11993: Emacs frames on other display hang during recursive edit on a


From: mail
Subject: bug#11993: Emacs frames on other display hang during recursive edit on a different display
Date: Wed, 18 Jul 2012 20:34:19 -0700

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':



    emacs -Q

        ...opens a frame (X Window)

        ...select that window, use it a bit to see that all works

        ESC-X make-frame-on-display

        ... type in display name
        ... note: in may case, the display is a different VNC session

        ... switch to the just opened emacs frame in that display, use it a bit
        to see that all works

        ... switch back, again, just to see that all works.

        ... in eother of the frames, type

        ESC-X recursive-edit

        ...  I am still able to work in the frame that initiated the recursive
        edit.

        ... However, in the other frames of the emacs, while I can select the
        frame (X Window), and the cursor changes from outline to filled, I
        cannot do anything useful.  The other frame(s) are hung: typing is not
        accepted, mouse clicks do not move the cursor.

        ... but the frame in which you typed recursive-edit still works

        ... switch back to that frame, type

        ESC-X exit-recursive-edit

        ... everything now works, in all frames.

    Further investigation shows that this hang occurs whenever the
    minibuffer is open in another frame.  I also find

        http://www.mail-archive.com/address@hidden/msg08103.html

    to which Stallman responded:

        Re: Emacs hangs on current display when the minibuffer is active on another display
        Richard Stallman
        Wed, 27 Sep 2006 19:15:16 -0700

            If I leave the emacs on one
            display with the minibuffer active, emacs on the other display does
            not respond to anything until the minibuffer input is resolved (input
            entered, or quit).

        It is nearly impossible to fix this without making Emacs
        multi-threaded.  I hope that will be done some day, but I
        don't know if anyone is working on it.


    I suppose that I could give up and not report this bug.

    However, (a) reporting that this occurs with recursive-edit as well as
    minibuffer open may help the next person who encounters this bug, and
    (b) while I can imagine ways that the minibuffrer problem may be
    difficult to fix without multithreading (or good non-blocking
    asynchronous I/O), I must admit that I cannot imagine why recursive-edit
    would be like that.

    Also (c) I could swear that I *have* been able to use recursive-edit
    with multiple frames in the past, on older versions of emacs.  However, I
    cannot reproduce this at the moment - all of the different versions of
    emacs I have access to have this problem.

    (By the way, my apologies for mailing this bug report from Microsoft
    Outlook or Gmail, although it was prepared in EMACS.)

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/home/glew/import/emacs/emacs-24.1/install-dir-personal/share/emacs/24.1/etc/DEBUG.


In GNU Emacs 24.1.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.10.4)
 of 2012-07-13 on mipscs587
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40300000
Configured using:
 `configure '--with-gif=no'
 '--prefix=/home/glew/import/emacs/emacs-24.1/install-dir-personal''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> <down-mouse-1> <mouse-1> <escape> x m a 
k e - f r a m e <tab> - o n <tab> <return> l o c a 
l h o s t L : 1 <backspace> <backspace> <backspace> 
: 1 2 <return> <switch-frame> <help-echo> <down-mouse-1> 
<mouse-1> <escape> x r e c u r s i v e - e d u <backspace> 
i t <return> <down-mouse-1> <mouse-1> <escape> x e 
x i t - r e c u r s i v e - e d i t <return> <switch-frame> 
<down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1> 
<mouse-1> q q q <down-mouse-1> <mouse-1> <backspace> 
<backspace> <backspace> <escape> x r e p o r t - e 
m a c s - b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail regexp-opt rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils time-date tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham
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korean japanese hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
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x-toolkit x multi-tty emacs)


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