Shared keyword and the GC?

[sclytrack]

> How does it deal with the problem where a pointer in TLS points 
> to global data,

Need to run stop-the-world for shared heap. But it would be 
interesting to have blocks that have no shared pointers in them.


> or worse yet, a pointer in the global heap points to TLS?
>

Could you give an example?

> I'm pretty sure it can't without doing a full pass over the 
> entire heap, which seems to me like it defeats the purpose.

Yeah.

>
> But I may just be missing out on some restriction (type system 
> or whatever) Objective-C has that makes it feasible.