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Emacs hangs on Mac OS X
From: |
Piet van Oostrum |
Subject: |
Emacs hangs on Mac OS X |
Date: |
Wed, 03 Jan 2007 11:47:29 +0100 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.92 (darwin) |
With Emacs.app compiled from the pretest tarball (downloaded Dec 19) I get
a hang fairly often. I can't remember that I had these with the previous
version (from a CVS checkout), or at least much less often. Now I get them
about once a day. I have grabbed a stack trace with gdb:
#0 0xffff85d8 in ___spin_lock_relinquish () at
/System/Library/Frameworks/System.framework/PrivateHeaders/ppc/cpu_capabilities.h:186
#1 0x900031b4 in szone_malloc ()
#2 0x900030e4 in malloc_zone_malloc ()
#3 0x907bb488 in CFAllocatorAllocate ()
#4 0x907dc41c in CFRunLoopRunSpecific ()
#5 0x93208740 in RunCurrentEventLoopInMode ()
#6 0x93207d4c in ReceiveNextEventCommon ()
#7 0x9330c940 in ReceiveNextEventInMode ()
#8 0x00158034 in XTread_socket (sd=0, expected=1, hold_quit=0xbfffca6c) at
macterm.c:10410
#9 0x0008ad24 in read_avail_input (expected=0) at keyboard.c:6823
#10 0x001387a4 in alarm_signal_handler (signo=0) at atimer.c:397
#11 <signal handler called>
#12 0x9000437c in szone_malloc ()
#13 0x00000000 in ?? ()
I don't have the source of /System/Library/Frameworks/System.framework/
PrivateHeaders/ppc/cpu_capabilities.h, apparently this is compiled into the
system by Apple's developers.
It looks like a malloc call is interrupted by a timer alarm, and then the
system also needs a malloc. Malloc probably not being reentrant this should
be a cause of problems. Maybe the spin_lock stuff is a way to serialize the
malloc calls but this won't work for a signal handler, only for threads.
The timer is probably for poll_for_input.
I think something should be done to prevent mallocs (and probably also
frees) to be interrupted by the alarm signal. Or maybe doing the event loop
in a signal handler is not such a good idea.
Another possibility would be to run the event loop in a different thread
and let it put all events in a synchronized queue, where it can be popped
by read_avail_input.
--
Piet van Oostrum <address@hidden>
URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C4]
Private email: address@hidden
- Emacs hangs on Mac OS X,
Piet van Oostrum <=