Async and await
Generated on 12/3/2024
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The concept of async and await in Swift is a key feature for handling asynchronous operations. In Swift, when a function may suspend its execution to wait for an asynchronous operation to complete, it 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 point in the code.
This feature is particularly useful in scenarios where tasks need to wait for operations like reading from disk or messaging another service. During this wait, the task suspends, allowing the CPU to be used by other tasks that have work to do. This is part of Swift's concurrency model, which aims to efficiently manage resources and improve performance.
For more details on how async and await are implemented in Swift, you can refer to the session Explore Swift performance (24:33) which discusses the implementation of async functions and their performance implications. Additionally, the session A Swift Tour: Explore Swift’s features and design (18:33) covers the basics of writing concurrent code in Swift, including tasks, async/await, and actors.
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