• Concurrency
• Parallelism
• GCD
• Operations
• Synchronous vs Asynchronous
• Delayed task execution
• DispatchWorkItem
• Concurrent Loops
• Problems with Concurrency & Shared Memory
  • Deadlocks
  • Race Conditions
  • Readers-Writers Problem
  • Thread explosion
  • Priority inversion
• Interview challenges in iOS
• Testing in iOS (XCTest, Quick & Nimble)
• Xcode Project Management (Schemes, Targets, Build settings)

By the end of this class students will:

• know the difference between concurrency & parallelism
• know how to create serial and concurrent queues
• know how to create delayed tasks
• know how to identify deadlocks, race conditions and priority inversion in multi-threaded code
• practice common iOS interview projects & questions
• leverage various concepts in Grand Central Dispatch to use in their projects
• learn how to test code in iOS
• learn how to use Xcode's project management tools to build better projects

• Class Project Write Up

• Introduction to Concurrency in iOS
  • Threads, Work/Tasks, Concurrency & Parallelism, Core(s)
• Concurrency & Parallelism - Dispatch Queues
  • Dispatch Queues, Dispatch QoS
• Concurrency & Parallelism - Concurrency Challenges
  • Deadlocks, Priority Inversion, Race Conditions, Critical Section, Locking(mutexes, semaphores)
• Concurrency & Parallelism - Executing work with GCD
  • Readers-Writers Problem, DispatchWorkItem, DispatchGroups, Concurrent Loops, Delayed Task Execution
• Interview Practice Problem - Concurrency
• (NS)Operations
• Xcode Project Management - Schemes, Targets & Build Settings
• Testing
• Interview Practice Problem - Async Image Loading & Caching
• Interview Practice Problem - Networking & API's