Design a MyQueue of your own without GCD. Submitting a closure with async(_:) should run it on a background thread pool, it should support serial and concurrent modes, and it should offer sync(_:) too. Can you walk me through the core data structures and how the synchronization works?
The core is a FIFO work queue protected by a lock and a condition variable, plus a fixed-size pool of worker threads. Serial mode uses a running flag so only one item is taken at a time, and sync has the caller wait on a completion semaphore. Run the closure after releasing the lock, and recheck the condition in a while loop.
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What is GCD (Grand Central Dispatch), and why do you hand work to a queue instead of…
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ConcurrencyMultiple choiceIntro
Which of the following statements about sync/async and serial/concurrent queues are…
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ConcurrencyMultiple choiceAdvanced
You call this function, which takes a GCD queue, from the main thread. About how many…
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