[ python-Bugs-980092 ] tp_subclasses grow without bounds

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Bugs item #980092, was opened at 2004-06-25 17:54
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Category: Python Interpreter Core
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Eric Huss (ehuss)
Assigned to: Nobody/Anonymous (nobody)
Summary: tp_subclasses grow without bounds

Initial Comment:
Python 2.3.4

When heap allocated type objects are created, they will 
be added to their base class's tp_subclasses list as a 
weak reference.  If, for example, your base type is 
PyBaseObject_Type, then the tp_subclasses list for the 
base object type will grow for each new object.

Unfortunately remove_subclass is never called.  If your 
newly create type objects are deleted, then you will end 
up with a bunch of weak reference objects in the 
tp_subclasses list that do not reference anything.

Perhaps remove_subclass should be called inside 
type_dealloc?  Or, better yet, tp_subclasses should be a 
Weak Set.  I'm not certain what's the best solution.



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