[pypy-dev] cpyext performance

Stefan Behnel stefan_ml at behnel.de
Thu Aug 23 11:16:04 CEST 2012

Stefan Behnel, 03.07.2012 19:56:
> Amaury Forgeot d'Arc, 03.07.2012 18:26:
>> Maybe we should use a weak dictionary to cache the PyObject structure.
>> This already exists for objects defined and created from C...
> That would be really helpful. In particular, it would solve one of the most
> annoying problems that extensions currently have: even if you keep a Python
> reference to an object, e.g. in a list, its PyObject structure will die
> once the last C reference to it is gone. That is really hard to work around
> in some cases. It's very common to keep e.g. a Python list (or set) of byte
> strings and pass their char* buffer pointers into a C library. That doesn't
> currently work with cpyext.

Ok, so where would this have to be done? Is there a way to implement it
generically in that ubiquitous space.wrap() kind of call (whatever that
does internally), or would it have to be done explicitly whenever objects
pass the boundary?


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