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Showing content from https://mail.python.org/pipermail/python-dev/2003-November/040298.html below:

[Python-Dev] Making weakref callbacks safe in cyclic gc

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On Tue, Nov 18, 2003 at 02:21:45PM +1300, Greg Ewing wrote:
> I remember reading once about the finalization scheme used in a
> particular Smalltalk implementation (I think it was ParcPlace) in
> which an object requiring finalization registers another object to be
> notified after it has died.

I think that may be called "guardians".

  Neil

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