On Oct 19, 2011, at 11:38 AM, Terry Moore wrote:

> Yes. But he does state it is a read only not modified array. My understanding 
> is. 'Array' is an NSMutableArray, I was merely suggesting using freeze to 
> throw that exception just in case there maybe some code attempting to 
> write/modify.
> 
> Mutex is the way to go but it also has an overhead.

Didn't somebody (Ernie?) already post a set of mix-ins for the mutable object 
classes that used a per-object GCD queue to serialize operations against the 
object?  If the mail archives were easier to search, I'd pull it up, but it 
isn't and I'm too lazy. :)

- Jordan

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