[Python-Dev] Caching function pointers in type objects

Reid Kleckner rnk at mit.edu
Wed Mar 3 04:06:41 CET 2010

I don't think this will help you solve your problem, but one thing
we've done in unladen swallow is to hack PyType_Modified to invalidate
our own descriptor caches.  We may eventually want to extend that into
a callback interface, but it probably will never be considered an API
that outside code should depend on.


On Tue, Mar 2, 2010 at 9:57 PM, Benjamin Peterson <benjamin at python.org> wrote:
> 2010/3/2 Daniel Stutzbach <daniel at stutzbachenterprises.com>:
>> In CPython, is it safe to cache function pointers that are in type objects?
>> For example, if I know that some_type->tp_richcompare is non-NULL, and I
>> call it (which may execute arbitrary user code), can I assume that
>> some_type->tp_richcompare is still non-NULL?
> Not unless it's builtin. Somebody could have deleted the rich
> comparison methods.
> --
> Regards,
> Benjamin
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