I believe that reading is thread safe, but writing is not.  You could wrap all 
access to the array in methods which use the same GCD queue to read/write, and 
that would be thread safe.

Thanks,
Jon


On Mar 6, 2012, at 11:51 AM, Jan E. Schotsman wrote:

> Hello,
> 
> I have an array of progress values (number objects) for subprojects, from 
> which I calculate the overall progress .
> The array is an atomic property of the project class.
> 
> Is it safe to access this array from multiple threads, using methods like 
> objectAtIndex and replaceObjectAtIndex?
> 
> Jan E.
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