[Python-Dev] Re: tp_clear return value (original) (raw)

Tim Peters tim.one@comcast.net
Thu, 10 Apr 2003 22:51:27 -0400

[Greg Ewing]

I'd be pretty nervous about having any longjmps anywhere near anything Python.

Why?

If you do this, you'll have to make it very clear that tptraverse implementations MUST NOT alter any Python ref counts, or rely in any other way on running to completion.

That's so. For reasons explained earlier, it would be quite surprising to see a tp_traverse function play with anything's refcount (their purpose is to pass an object's PyObject* pointers on to the callback argument, and that's all; manipulating refcounts during this wouldn't make sense).