Concurrency by Tutorials

Projects, playgrounds, and other materials made while following along with the Ray Wenderlich book "Concurrency by Tutorials".

Contents

• Chapter 3: Queues & Threads

  • How to use a GCD queue to offload work from the main thread.
  • What is a thread? And, perhaps more importantly, how do we operate with them in the context of Apple platforms?

• Chapter 4: Groups & Semaphores

  • How to submit multiple tasks to a queue, which need to run together as a "group" so that we can be notified when they have all completed.
  • Wrapping an existing API so that it can be called asynchronously.

• Chapter 5: Concurrency Problems

  • Some of the common pitfalls encountered while executing concurrent tasks.

• Chapter 6: Operations

  • Utilizing the Operation class to gain more powerful control over concurrent tasks.

• Chapter 7: Operation Queues

  • Similar to Dispatch Queues, but for Operation instances.

• Chapter 8: Asynchronous Operations

  • Making operations themselves asynchronous now that we can submit them to Operation Queues.

• Chapter 9: Operation Dependencies

  • The "killer feature" of Operations is being able to tell the OS that one operation is dependant on another and shouldn't being until the dependency has finished.

• Chapter 10: Cancelling Operations

  • Cancelling operations when they're running — or before they've even started.

• Chapter 11: Core Data

  • Core Data works well with concurrency — as long as a few specific rules are kept in mind. This chapter covers just that.

• Chapter 12: Thread Sanitizer

  • Data races occur when multiple threads access the same memory without synchronization, and at least one access is a write. This chapter covers using Apple’s Thread Sanitizer to detect data races.