NSOperationQueue
Frequently, multithreading is used for processing chunks of information in the background. In such cases, Cocoa’s NSOperationQueue provides a very mature framework for organizing the processing.
NSOperationQueue represents a collection of operations (encapsulated by NSOperation) and manages the execution of those operations on one or more threads. Every application has a main queue that represents the main thread; it is accessed using NSOperationQueue.mainQueue(). If the application needs additional queues, it can create and configure them simply by initializing a new NSOperationQueue.
By default, NSOperationQueue objects are configured to run several operations concurrently. The exact number is determined automatically ...
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