[bug #24867] `define' should be thread-safe

[bug #24867] `define' should be thread-safe

[Linas Vepstas]

Follow-up Comment #12, bug #24867 (project guile):

Sooo .. is this bug fixed in guile-2.0.5 or 2.0.9?

Because I'm currently staring at the five-year-old work-around for this bug,
wondering if I should remove it or not. It's definitely a bottle-neck for my
app (natural language processing for opencog).

Some of my guile scripts run for minutes, which means, as long as guile
remains single-threaded, I can't use it while a script is running. This makes
development incredibly painful...

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?24867>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/

[bug #24867] `define' should be thread-safe

[Linas Vepstas]

Follow-up Comment #13, bug #24867 (project guile):

To answer my own question:
-- compile test case below, as:
cc define-race.c -lpthread -lguile-2.0 -I/usr/include/guile/2.0

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff5d44700 (LWP 7601)]
0x00007ffff7243bc9 in GC_push_all_eager () from /usr/lib/libgc.so.1
(gdb) bt
#0  0x00007ffff7243bc9 in GC_push_all_eager () from /usr/lib/libgc.so.1
#1  0x00007ffff724bee1 in GC_push_all_stacks () from /usr/lib/libgc.so.1
#2  0x00007ffff7244733 in GC_mark_some () from /usr/lib/libgc.so.1
#3  0x00007ffff723b802 in GC_stopped_mark () from /usr/lib/libgc.so.1
#4  0x00007ffff723bf0a in GC_try_to_collect_inner () from /usr/lib/libgc.so.1
#5  0x00007ffff72465d0 in GC_init_inner () from /usr/lib/libgc.so.1
#6  0x00007ffff78af793 in ?? () from /usr/lib/libguile-2.0.so.22
#7  0x00007ffff78be9a8 in ?? () from /usr/lib/libguile-2.0.so.22
#8  0x00007ffff79118f0 in ?? () from /usr/lib/libguile-2.0.so.22
#9  0x00007ffff7911927 in ?? () from /usr/lib/libguile-2.0.so.22
#10 0x00007ffff72461e5 in GC_call_with_stack_base () from /usr/lib/libgc.so.1
#11 0x00007ffff7911ae8 in scm_with_guile () from /usr/lib/libguile-2.0.so.22
#12 0x0000000000400b2e in definer ()
#13 0x00007ffff7bc4e9a in start_thread (arg=0x7ffff5d44700) at
pthread_create.c:308
#14 0x00007ffff75793fd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#15 0x0000000000000000 in ?? ()


This is with 
$ guile --version
guile (GNU Guile) 2.0.5-deb+1-1

installed on an Ubuntu Precise system

The corresponding GC seems to be froom a package called 
libgc1c2 - conservative garbage collector for C and C++
which installs libgc.so.1.0.3
The last entry in the ChangeLog is 
libgc (1:7.1-8ubuntu0.12.04.1) precise-security; urgency=low

so this seems to be the bdwgc version 7.1

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?24867>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/