> On Mar 13, 2017, at 5:54 PM, Matthew Johnson <matt...@anandabits.com> wrote:

> 
> I suspect you're right about this for the most part but I think we will want 
> the ability for "failable processes" (or whatever they're called) to have 
> read-only access to shared state that outlives them.  What I can't imagine is 
> allowing them write access to state that is shared.

The problem there is that shared data in Swift always has a retain count, so 
we'd need some way to track when code in one of these "mini-processes" retains 
an external object so we can release it if it crashes. Perhaps you'd need to 
wrap a proxy type around shared objects (or instances containing shared 
objects, like Array and String) and the proxies would register themselves with 
the runtime as needing emergency cleanup beyond unceremonious deallocation of 
their "mini-process"'s memory space. This is all doable; it just needs to be 
designed and done. 

-- 
Brent Royal-Gordon
Sent from my iPhone
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