RE: no stacktrace available

["Boehm, Hans" <hans dot boehm at hp dot com>]

I believe the GC currently has not thread support under NetBSD,
at least not in my version.  The symptom below is typical for an
attempt to run the single-threaded GC in a multi-threaded
environment.

If your application doesn't need threads (and uses at most trivial
finalizers), you might be able to get gcj up without thread
support.

Jerome Laban posted about an attempt to fix the GC (July 9,
http://news.gmane.org/gmane.comp.programming.garbage-collection.boehmgc)
but I don't believe that resulted in a final patch.  I think he
ended up trying to fix real-time signals, which the collector
uses on some platforms for stopping threads, but are not essential for
the GC.  (They're not currently used on Linux.)

I don't know what the status of his work is.  Nor do I understand why
the Linux code doesn't just work.  But I haven't personally tried
to get the collector up on NetBSD.

Hans

> -----Original Message-----
> From: java-owner@gcc.gnu.org 
> [mailto:java-owner@gcc.gnu.org]On Behalf Of
> Michael Koch
> Sent: Tuesday, December 14, 2004 5:51 AM
> To: Bart Locanthi
> Cc: java@gcc.gnu.org
> Subject: Re: no stacktrace available
> 
> 
> Am Dienstag, 14. Dezember 2004 14:43 schrieb Bart Locanthi:
> > oops, i spoke too soon. got a core dump that may again be related
> > to threading/gc. i vaguely remember the form of the error - an
> > infinite stack trace.
> >
> > ...
> > #494 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #495 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #496 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #497 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #498 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #499 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #500 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #501 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #502 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #503 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #504 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> > #505 0x485f01b0 in GC_clear_stack_inner () from
> > /usr/pkg/gcc3/lib/libgcj.so.4
> 
> For this I can only say: Try newest GCJ from CVS and see if its still 
> not fixed.
> 
> 
> Michael
> -- 
> Homepage: http://www.worldforge.org/
>