concurrency changes?
Asked on 06/16/2025
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At WWDC, several sessions discussed changes and improvements to concurrency in Swift. Here are some key points:
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Swift 6.2 Concurrency Improvements: Swift 6.2 introduces changes to make concurrency more approachable. These changes are opt-in and can be enabled in Xcode under the Swift Compiler Concurrency section or in a Swift package manifest file. The language changes aim to make code data race-free by default, providing a safer path to introducing concurrency in projects (What’s new in Swift).
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Concurrency in Swift 6: The Swift 6 language mode is designed to make concurrent code safer by achieving data race safety by default. This turns potential data race issues into compile-time errors, improving app security and reducing debugging time (What’s new in Swift).
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Concurrency Architecture: The migration to Swift 6 involves adopting a more structured concurrency architecture. This includes using actors to manage UI and background operations, which helps in organizing concurrency more clearly and avoiding data races (Migrate your app to Swift 6).
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Concurrency in Practice: The session "Embracing Swift concurrency" discusses how to use Swift Concurrency to improve app performance by introducing asynchronous or concurrent code when needed. It emphasizes the importance of data race safety and provides guidance on using concurrency effectively (Embracing Swift concurrency).
These sessions provide a comprehensive overview of the concurrency changes in Swift, focusing on making concurrency safer and more approachable for developers.
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.
Migrate your app to Swift 6
Experience Swift 6 migration in action as we update an existing sample app. Learn how to migrate incrementally, module by module, and how the compiler helps you identify code that’s at risk of data races. Discover different techniques for ensuring clear isolation boundaries and eliminating concurrent access to shared mutable state.
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.