GNU bug report logs - #12384
24.2.50; NS: mouse movement causes hang during scroll benchmark

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: YAMAMOTO Mitsuharu <mituharu <at> math.s.chiba-u.ac.jp>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; NS: mouse movement causes hang during scroll benchmark
Date: Sat, 08 Sep 2012 17:36:22 +0900

Steps to Reproduce:

1. $ .../Emacs.app/Contents/MacOS/Emacs -Q &
2. Evaluate the following expression:

;; Scroll benchmark from
;; http://lists.gnu.org/archive/html/emacs-devel/2012-08/msg00411.html
(defun scroll-benchmark () 
   (interactive) 
   (let ((oldgc gcs-done) 
         (oldtime (float-time))) 
     (condition-case nil (while t (scroll-up) (redisplay)) 
       (error (message "GCs: %d Elapsed time: %f seconds" 
                       (- gcs-done oldgc) (- (float-time) oldtime)))))) 

3. Evaluate the following expression:

(progn
  (find-file (expand-file-name "src/xdisp.c" source-directory))
  (goto-char (point-min))
  (redisplay)
  (scroll-benchmark))

4. Wait for the benchmark to finish.
5. Repeat Step 3.
6. Before the second benchmark run completes, move the mouse pointer.

Then, we can observe the followings until the benchmark finishes.

  - The scroll bar thumb stops moving.
  - The mouse pointer turns into the "spinning rainbow".
  - C-g cannot quit the benchmark.

This does not happen on X11 builds or the Mac port.

See also
http://lists.gnu.org/archive/html/emacs-devel/2012-08/msg00469.html .

				     YAMAMOTO Mitsuharu
				mituharu <at> math.s.chiba-u.ac.jp

In GNU Emacs 24.2.50.1 (x86_64-apple-darwin12.1.0, NS apple-appkit-1187.00)
 of 2012-09-08 on YAMAMOTO-no-iMac.local
Bzr revision: 109934 monnier <at> iro.umontreal.ca-20120907201455-blix9xyqrsksqwyz
Windowing system distributor `Apple', version 10.3.1187
Configured using:
 `configure '--with-ns''

Important settings:
  value of $LANG: ja_JP.UTF-8
  locale-coding-system: utf-8-unix
  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

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