On Mar 22, 2013, at 23:27 , Quincey Morris 
<quinceymor...@rivergatesoftware.com> wrote:

> The reason for this is not much about performance. ('atomic' is slower, but 
> not by much.) 

On my machine, the difference is around 4x for the read accessor, 3 ns 
nonatomic vs. 13ns atomic.

Cheers,

Marcel

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