[Python-Dev] Accessing globals without dict lookup (original) (raw)

Jeremy Hylton jeremy@alum.mit.edu
Sat, 9 Feb 2002 23:21:01 -0500

"JH" == Jeremy Hylton <jeremy@alum.mit.edu> writes:

JH> Case #1: Binding operation responsible for invalidating cache.

JH> The module has a dlict for globals that contains three entries: JH> [math, mysin, yikes]. Each is a PyObject *.

JH> The module also has a global attrs cache, where each entry is JH> struct { JH> int ce_initialized; /* just a flag */ PyObject **ce_ref; JH> } cache_entry;

JH> In the case we're considering, ce_module points to math and JH> ce_module_index is math's index in the globals dlict. It's JH> assigned to when the module object is created and never changes.

Just pretend I didn't write this paragraph :-(. I was going to describe the other case first, then changed my mind. The previous paragraph describes Case #2.

The text before and after this paragraph looks clear to me. Does anyone else agree? I didn't think I had done any hand waving on globals and module attributes in the slides; so I expect that I'm not a good judge of what is hand waving and what is high-level description.

Jeremy