I found that searching the google groups mirror was much easier and this might be the thread you're referring to:
https://groups.google.com/d/topic/macruby/ceyNNqComMc/discussion
-sas
On Oct 19, 2011, at 22:43, Jordan K. Hubbard wrote:
>
> 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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