Hi Stefan, On Sat, 24 Nov 2018 at 22:17, Stefan Behnel <stefan_ml at behnel.de> wrote: > Couldn't this also be achieved via reference counting? Count only in C > space, and delete the "open object" when the refcount goes to 0? The point is to remove the need to return the same handle to C code if the object is the same one. This saves one of the largest costs of the C API emulation, which is looking up the object in a big dictionary to know if there is already a ``PyObject *`` that corresponds to it or not---for *all* objects that go from Python to C. Once we do that, then there is no need for a refcount any more. Yes, you could add your custom refcount code in C, but in practice it is rarely done. For example, with POSIX file descriptors, when you would need to "incref" a file descriptor, you instead use dup(). This gives you a different file descriptor which can be closed independently of the original one, but they both refer to the same file. A bientôt, Armin.
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