Re: [Gc]: garbage collection on OSX Snow Leopard
ivmai at mail.ru
Tue Oct 20 14:59:59 PDT 2009
"Boehm, Hans" <hans.boehm at hp.com> wrote:
> > OpenBSD keeps its own port of the garbage collector (v7.1)
> > with fixes that apparently have not been accepted upstream.
> I don't recall a submission of those patches, though it's conceivable they were lost. If you have a contact, could you suggest they (re)submit a patch? If they maintain their own that's clearly fine, but seems to involve extra overhead.
I've just "ported" OpenBSD gc7.0 port: https://www.openbsd.org/cgi-bin/cvsweb/ports/devel/boehm-gc/patches/
In major, I've did the following changes:
1. I haven't added include/private/openbsd_stop_world_h and openbsd_stop_world_c to GC tree - instead, I've added the OpenBSD-specific code to pthread_stop_world.h and pthread_stop_world.c (so, no code is duplicated);
2. I haven't add this code to pthread_support.c:
@@ -1103,6 +1106,12 @@ void * GC_start_routine(void * arg)
return GC_inner_start_routine(&sb, arg);
+# elif defined(GC_OPENBSD_THREADS)
+ /* On OpenBSD GC_get_stack_base() doesn't cause any allocations */
+ struct GC_stack_base sb;
+ if (GC_get_stack_base(&sb) != GC_SUCCESS)
+ ABORT("Failed to get thread stack base.");
+ return GC_inner_start_routine(&sb, arg);
return GC_call_with_stack_base(GC_inner_start_routine, arg);
It seems the authors doesn't fully understand why GC_call_with_stack_base() is used here.
No testing has been done (on my side).
what's about legacy/copyright issue? (The code I've just checked in is based (~90%) on 3rd party code.)
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