Maybe this will helps you, here is my thread-safe subclass of NSMutableArray: 
http://code.google.com/p/cogeopensource/source/browse/trunk/CoGeOpenSource/CoGeThreadSafeMutableArray.m

Works well for my project.



On Mar 8, 2012, at 11:22 AM, Jan E. Schotsman wrote:

> Thanks for all the answers.
> 
> 1. I'll read the ThreadSafetySummary. So far I had only read the Threading 
> section of the Objective C Programming Language.
> 
> 2. Accessing the progress values of the subprojects seems the way to go here.
> 
> 3. Creating a proxy mutable array seems like overkill. Basically this is a 
> thread-safe subclass of NSMutableArray, correct?
> 
> 4. @Don Quixote: interesting lecture. Now I know what 'lockfree" means.
> 
>> To improve performance share as little data as possible, access it as 
>> infrequently as possible and if you access it at all, finish what you're 
>> doing with the shared data as quickie as you can.
> 
> In this case the subprojects shouldn't update their progress values too 
> often. Only if additional progress is more than 1% for example.
> 
> Jan E.
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Tamas Nagy
-----------------
CoGe VJ Software
http://cogevj.hu        
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