Guido van Rossum wrote:
I don't know how you define simple. In order to be able to have separate GILs you have to remove *all* sharing of objects between interpreters. And all other data structures, too. It would probably kill performance too, because currently obmalloc relies on the GIL.
Nitpick: You have to remove all sharing of *mutable* objects. One day, when we get "pure" GC with no refcounting, that will be a meaningful distinction. :)