[Python-Dev] PyWeakref_GetObject() borrows its reference from... whom?

[Xavier Morel]

> On 2016-10-10, at 11:05 , Devin Jeanpierre <jeanpierreda at gmail.com> wrote:
> The term "borrowed" is supposed to imply a sensible scope during which you're free to use the object, and weakrefs don't have that (except for what is granted by the GIL), so this does sound wacky. I bet it was for performance.

Especially as it handles both getting an object from a weakref and
checking whether the weakref is still alive.

OTOH it could be an enshrined bug, http://bugs.python.org/issue520087
fixed a discrepancy between the doc and the implementation by matching
the doc to the implementation (of returning a borrowed ref').

Also of note, pypy developers have been reporting issues with that
specific API since ~2010[0][1], and IIRC they have added a
PyWeakref_LockObject to cpyext.

[0] http://bugs.python.org/issue8578
[1] http://bugs.python.org/issue16602#msg177272
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