bpo-29347: Fix possibly dereferencing undefined pointers when creating weakref objects by zhangyangyu · Pull Request #186 · python/cpython

…eters.

Previously creating a subinterpreter in one thread and using it in
another thread caused a crash. Now Stackless resets the thread state,
once all C-stacks have been executed.

…eters.

Make slp_register_execute() idempotent. It could be called more than once for
the same type.