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Re: Hash Tables and GC
Date: Wed, 7 Sep 88 11:52 PDT
Just to throw a little light into this discussion: On Symbolics systems there
is a list of forms to be evaluated before any gc flip (ephemeral or dynamic).
It's possible to implement whatever kind of weak pointers strategy you want by
explicitly clearing whatever pointers are "weak" before the flip occurs. The
list is called SI:GC-EVERY-FLIP-LIST
I don't think this works. After the flip finishes you will then need to
restore the weak pointers that pointed to objects that also had strong
pointers pointing to them. How do you do this?