[issue9141] Allow objects to decide if they can be collected by GC

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> All this patch does, is to generalize the mechanism already provided
> for genobject.c (by PyGen_NeedsFinalizing()), to any object: Any
> object can signal to gc that: a) it is ok to collect a cycle with me
> in it, or b) no, it is unsafe to do so.  With this patch in place,
> PyGen_NeedsFinalizing() no longer needs to be a special case in
> gcmodule.c.

Adding an API function and an additional traversal pass to the GC just
for the sake of removing a special case doesn't seem reasonable to me.
That's why I'm asking what specific problem you are trying to solve.
(rather than simply trying to make things "nicer")

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<http://bugs.python.org/issue9141>
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