[Python-Dev] Caching function pointers in type objects (original) (raw)

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.

Reid

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 sometype->tprichcompare is non-NULL, and I call it (which may execute arbitrary user code), can I assume that sometype->tprichcompare is still non-NULL? Not unless it's builtin. Somebody could have deleted the rich comparison methods. -- Regards, Benjamin

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