Pro multithreading and memory management for iOS and OS X : [with ARC Grand Central Dispatch and Blocks ; gain insight into Xcodes memory and thread management] If you want to develop efficient smooth running applications controlling concurrency and memory are vital. Automatic Reference Counting is Apples game changing memory management system new to Xcode 4.2. Pro Multithreading and Memory Management for iOS and OS X shows you how ARC works and how best to incorporate it into your applications