Running in a Dispatch Queue
Dispatch queues are provided by Grand Central Dispatch to execute blocks of code in a managed environment. GCD is designed to maximize concurrency and take full advantage of multicore processing power by managing the number of threads allocated to a queue dynamically based on the status of the system.
GCD offers three types of queues: the main queue, concurrent queues, and serial queues. The main queue is a special queue created by the system, which is tied to the application’s main thread. In iOS, three concurrent queues are available: the high-, normal-, and low-priority queues. Serial queues can be created by the application and must be managed like any other application resource. The sample app demonstrates using ...
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