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Answer Posted / Mrinal Kaushick
dispatch_once is a function provided by Apple's Grand Central Dispatch (GCD) library in Objective-C. It ensures that a block of code is executed no more than once during the lifetime of a particular process. This is achieved through an atomic flag, which prevents multiple threads from executing the block concurrently. The first time the function dispatch_once() is called for a specific control variable, the associated block will be executed. Subsequent calls to dispatch_once() with the same control variable will not execute the block again.
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