On Fri, May 22, 2009 at 4:53 PM, David Semeria <david at lmframework.com> wrote: > Ok. I assume object references are implemnted bi-directionally, > otherwise the GC would take a lifetime to run. I don't know of any that are implemented bidirectionally, since it would be a waste of space; it's certainly not required for any fast GC I know of. Mike