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Re: emacs hangs in c++ font-lock-mode
From: |
Dirk Farin |
Subject: |
Re: emacs hangs in c++ font-lock-mode |
Date: |
Sat, 16 Apr 2005 19:34:00 +0200 |
User-agent: |
Debian Thunderbird 1.0 (X11/20050116) |
First the good news: the problem does not appear anymore in the current
Emacs CVS version 22.0.50 (with cc-mode 5.30.9).
I have got a C++ source file that causes "GNU Emacs 21.4.1" (current Debian
testing) to hang with 100% cpu. To reproduce the bug, load the attached
source file and turn font-lock-mode on in C++ mode. If you move the cursor
down, at some position, emacs will hang and accept no more keyboard inputs.
I know that everything will still be set up to their defaults, but could
you perhaps give us some more details just the same:
How powerful is your computer? (Processor speed in MHz or GHz).
2.6 GHz, x86, but I tested on a variety of different systems with the
same result.
What version of CC Mode have you got? (M-x c-version)
"Using CC Mode version 5.28"
Did you start your session with "emacs -q --no-site-file"? (I.e. without
your .emacs and any site-lisp.el loaded.) If not, do you still get the
problem when you do?
Does not change anything.
Does Emacs _always_ hang up, _usually_ hang up or _sometimes_ hang up?
always
How long does it take after loading the file before it hangs? Does it
free up if you leave it running 8 or 12 hours or more?
It occurs immediately. Start a new emacs, load the provided source code,
scroll down and it hangs.
I didn't check for several hours, but it stays locked for at least
10 minutes without increasing memory consumption.
What support mode are you using in font lock? (C-h v
font-lock-support-mode). Probably jit-lock-mode, the default. Does the
problem go away if you use lazy lock instead? (Do M-: (setq
Yes, it it jit-lock-mode. If I switch to lazy mode, it locks already
while loading the file. Last message before it dies:
"Fontifying emacs_hang.cc... (regexps...............)"
[OT good news: My city council has just decided to use Debian as the
replacement for MS-Windows on its several thousand desktop PCs. They're
hoping to start rolling it out at the end of this year. :-]
Ja, schoen. Habe ich auch gerade in den DLF Nachrichten gehoert.