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iOS concurrency, the run loop, and GCD BN.University

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Concurrency in iOS

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main.m

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The Run Loop

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The run loop

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UI Threading

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Queues

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Blocks

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Libdispatch

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Tools for Concurrency

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Tools for Concurrency NSOperation{,Queue} Grand Central Dispatch NSThread POSIX threads

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POSIX threads

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Tools for Concurrency NSOperation{,Queue} Grand Central Dispatch NSThread POSIX threads

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NSThread

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NSThread Server Connections? File System Watching? Database Connection? Regular (cron-like) event?

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Tools for Concurrency NSOperation{,Queue} Grand Central Dispatch NSThread POSIX threads

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Grand Central Dispatch

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Grand Central Dispatch Parallel Array Iteration

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Grand Central Dispatch Dispatching a background task

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Grand Central Dispatch Calling back for UI Updates

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Tools for Concurrency NSOperation{,Queue} Grand Central Dispatch NSThread POSIX threads

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NSOperation{,Queue}

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NSOperation{,Queue}

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NSOperation{,Queue} Image Metrics Colorize Resize UI JPEG Upload

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Demo!