On Jan 17, 2013, at 2:40 AM, Rick Mann wrote:

> I can't change the complex process to work in discrete chunks.

But you have access to the writing process source so that you can add a few 
lines of code for synchronization stuff? If so, this is kind of a classic case 
for a condition variable; there are Cocoa classes (NSConditionVariable iirc) 
for it; and I'd be surprised if there isn't something in GCD...

-- 
Scott Ribe
scott_r...@elevated-dev.com
http://www.elevated-dev.com/
(303) 722-0567 voice





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