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Book Overview & Buying
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Table Of Contents
Mastering Swift 6 - Seventh Edition
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We started this chapter by explaining the concepts of concurrency and parallelism, which are often confused but have distinct meanings in software development. Concurrency involves managing multiple tasks in overlapping time periods, without them necessarily running simultaneously. To illustrate this, we used the example of a juggler with multiple balls. A single juggler can only catch and throw one ball at a time, similar to how a single-core processor handles one task at a time. For true parallelism, where each ball is juggled at the same time, multiple jugglers or multiple processor cores are required.
Next, we discussed how these concepts apply in software development using Swift’s Grand Central Dispatch (GCD). GCD organizes tasks into queues, which can be either serial or concurrent. Serial queues handle one task at a time in the order they are added, ideal for tasks that need to be done in sequence. Concurrent queues allow tasks to run simultaneously, speeding up...