Equivalent of GCD serial dispatch queue in iOS 3.x

Question

Apple\'s Grand Central Dispatch (GCD) is great, but only works on iOS 4.0 or greater. Apple\'s documentation says, \"[A] serialized operation queue does not offer quite the

Answer 1

If the processing is in the background anyway, do you really need it to be strictly in-order? If you do, you can achieve the same effect simply by setting up your dependencies so 1 depends on 0, 2 on 1, 3 on 2, etc. The operation queue is then forced to handle them in order. Set the maximum concurrent operation count to 1, and the queue is also guaranteed to be serial.