* emacs hangs in c++ font-lock-modeo [not found] <mailman.1466.1113474986.2895.bug-gnu-emacs@gnu.org> @ 2005-04-16 16:50 ` Alan Mackenzie 2005-04-16 17:34 ` emacs hangs in c++ font-lock-mode Dirk Farin 0 siblings, 1 reply; 2+ messages in thread From: Alan Mackenzie @ 2005-04-16 16:50 UTC (permalink / raw) Cc: bug-gnu-emacs [cc to bug-cc-mode@gnu.org added.] >From d.s.farin@tue.nl Fri Apr 15 20:33:22 2005 > Hi, > 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. Outch! That's nasty. I had that happen to me a couple of years ago. 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). What version of CC Mode have you got? (M-x c-version) 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 Emacs _always_ hang up, _usually_ hang up or _sometimes_ hang up? 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? How many other buffers have you got loaded at the same time, how big are they (a few kilobytes, or a few hundred kilobytes), what modes are they (other C++, perhaps)? 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 font-lock-support-mode 'lazy-lock-mode) before loading the buffer (or put the setq in your .emacs, or do the same thing in the pertinent customize buffer.)) Regards, Dirk [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. :-] -- Alan Mackenzie (Munich, Germany) ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: emacs hangs in c++ font-lock-mode 2005-04-16 16:50 ` emacs hangs in c++ font-lock-modeo Alan Mackenzie @ 2005-04-16 17:34 ` Dirk Farin 0 siblings, 0 replies; 2+ messages in thread From: Dirk Farin @ 2005-04-16 17:34 UTC (permalink / raw) Cc: bug-cc-mode, bug-gnu-emacs 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. ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2005-04-16 17:34 UTC | newest] Thread overview: 2+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- [not found] <mailman.1466.1113474986.2895.bug-gnu-emacs@gnu.org> 2005-04-16 16:50 ` emacs hangs in c++ font-lock-modeo Alan Mackenzie 2005-04-16 17:34 ` emacs hangs in c++ font-lock-mode Dirk Farin
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