Why GIL? (was Re: what's the point of rpython?)

[Paul Rubin]

Carl Banks <pavlovevidence at gmail.com> writes:
> > What's more, this matters when considering a GIL-less implementation.
> > Typical method calls can traverse lots of mutable stuff just to find the
> > function to invoke.
> 
> Now that doesn't make sense at all.  What is all this mutable stuff
> you have to go through, and what does it have to do with the GIL-less
> implementation? 

foo.bar() has to look up bar in foo's attribute dictionary.