1. [12 Pts] Concurrency in ios applications a) What is the difference between concurrent queue and...

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1. [12 Pts] Concurrency in ios applications a) What is the difference between concurrent queue and serial queue in ios? b) Grand Central Dispatcher (CGD) is the main concurrency mechanism in ios applications. GCD provides five different queues by default as the application is launched. List and explain each queue type GCD provides by default. c) Consider the following code segment that uses two queues. Explain how the queue operation works as this code is being executed let queue= dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) dispatch_async (queue) ( () -> Void in let img = Downloader.downloadImageWithURL (imageURLs (01) dispatch_async (dispatch_get_main_queue(), { self.imageViewl.image = img1 } }) dispatch_async (queue) { () -> Void in let img2 = Downloader.downloadImageWithURL (imageURLs [i]) dispatch_async (dispatch_get_main_queue(), { self.imageView2.image = img2 }) 1. [12 Pts] Concurrency in ios applications a) What is the difference between concurrent queue and serial queue in ios? b) Grand Central Dispatcher (CGD) is the main concurrency mechanism in ios applications. GCD provides five different queues by default as the application is launched. List and explain each queue type GCD provides by default. c) Consider the following code segment that uses two queues. Explain how the queue operation works as this code is being executed let queue= dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) dispatch_async (queue) ( () -> Void in let img = Downloader.downloadImageWithURL (imageURLs (01) dispatch_async (dispatch_get_main_queue(), { self.imageViewl.image = img1 } }) dispatch_async (queue) { () -> Void in let img2 = Downloader.downloadImageWithURL (imageURLs [i]) dispatch_async (dispatch_get_main_queue(), { self.imageView2.image = img2 })