NSThread and object retain count issue?

As others have stated, your code is fine since +detachNewThreadSelector:toTarget:withObject: retains the target. However, I should point out a problem in your terminology. You should not worry about 'newObject' being "released" during the thread (The frameworks are free to retain and release any objects as much as they like as long as the calls are balanced), but instead worry about it being "deallocated."

Your code will almost certainly release the 'newObject' while the thread is running, but it won't be deallocated.

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