what is @concurrent?
Asked on 06/16/2025
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The @concurrent attribute in Swift is used to ensure that a function always runs on the concurrent thread pool. This allows the actor to run other tasks simultaneously, improving performance by offloading work to the background. This attribute is part of Swift's concurrency model, which aims to make concurrent code easier to write and safer by identifying potential data races at compile time. The use of @concurrent is particularly beneficial for tasks that are CPU-intensive and should not block the main actor or any other actor.
For more details, you can refer to the session What’s new in Swift (34:57).
Embracing Swift concurrency
Join us to learn the core Swift concurrency concepts. Concurrency helps you improve app responsiveness and performance, and Swift is designed to make asynchronous and concurrent code easier to write correctly. We’ll cover the steps you need to take an app through from single-threaded to concurrent. We’ll also help you determine how and when to make the best use of Swift concurrency features – whether it’s making your code more asynchronous, moving it to the background, or sharing data across concurrent tasks.
Explore concurrency in SwiftUI
Discover how SwiftUI leverages Swift concurrency to build safe and responsive apps. Explore how SwiftUI uses the main actor by default and offloads work to other actors. Learn how to interpret concurrency annotations and manage async tasks with SwiftUI’s event loop for smooth animations and UI updates. You’ll leave knowing how to avoid data races and write code fearlessly.
What’s new in Swift
Join us for an update on Swift. We’ll talk about workflow improvements that make you more productive, and new and modernized library APIs for fundamental programming tasks. We’ll show examples of Swift adoption throughout more layers of the software stack. Finally, we’ll explore new language features for both improving approachability of concurrency, and achieving peak performance when you need it.