task async await

The concept of async and await in Swift is a key part of its concurrency model, allowing developers to write asynchronous code that is easier to read and maintain. Here's a brief overview based on the content from WWDC:

1. Async/Await Syntax: In Swift, a function that may suspend is marked with the async keyword. When calling an async function, the await keyword is used to indicate that a suspension can occur at that line. This allows the CPU to yield to other tasks while waiting for an asynchronous operation to complete. This is covered in the session A Swift Tour: Explore Swift’s features and design.

2. Concurrency and Actors: Swift introduces actors, which are reference types that encapsulate shared mutable state and automatically protect their state by serializing accesses. Calls to actor methods from outside the context of the actor are asynchronous, requiring the use of await. This is also discussed in the session A Swift Tour: Explore Swift’s features and design.

3. Performance Considerations: Async functions in Swift are split into partial functions at runtime, which span the gaps between potential suspension points. This allows for efficient memory allocation and deallocation, as discussed in the session Explore Swift performance.

These sessions provide a comprehensive look at how Swift handles asynchronous operations and concurrency, making it easier to write safe and efficient concurrent code.