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...Custom queues, dispatch block after delay, cancel blocks that aren't already dispatched. The way it work is by using the new notification API for GCD introduced in OS X 10.10 and iOS 8. Each chaining block is called when the previous queue has finished. The dispatch_block_t can't be extended. Workaround used, Wrap dispatch_block_t in a struct that takes the block as a property. AsyncGroup facilitates working with groups of asynchronous blocks.