What's new in Swift Concurrency
Generated on 3/3/2025
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In the "What's new in Swift" session at WWDC 2024, several updates to Swift Concurrency were highlighted:
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Data Race Safety: Swift 6 introduces a new language mode that achieves data race safety by default. This means that data race issues in your app are turned into compile-time errors, significantly improving the security and reliability of your app. This feature is part of the Swift 6 language mode, which you can adopt module by module.
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Concurrency Model Enhancements: Swift continues to refine its concurrency model, which includes async/await, actors, and structured concurrency. These features help in building safer and more efficient concurrent programs.
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Low-Level Synchronization Primitives: Swift 6 introduces new low-level primitives for synchronization, such as atomics and mutexes. These are designed to provide efficient, lock-free implementations and ensure safe concurrent access.
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Incremental Migration: The session also discusses the infrastructure for incremental migration to Swift 6, allowing developers to adopt new concurrency features at their own pace.
For more detailed information, you can refer to the What’s new in Swift session starting at 26:07.
What’s new in Swift
Join us for an update on Swift. We’ll briefly go through a history of Swift over the past decade, and show you how the community has grown through workgroups, expanded the package ecosystem, and increased platform support. We’ll introduce you to a new language mode that achieves data-race safety by default, and a language subset that lets you run Swift on highly constrained systems. We’ll also explore some language updates including noncopyable types, typed throws, and improved C++ interoperability.
A Swift Tour: Explore Swift’s features and design
Learn the essential features and design philosophy of the Swift programming language. We’ll explore how to model data, handle errors, use protocols, write concurrent code, and more while building up a Swift package that has a library, an HTTP server, and a command line client. Whether you’re just beginning your Swift journey or have been with us from the start, this talk will help you get the most out of the language.
Platforms State of the Union
Discover the newest advancements on Apple platforms.
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.
What’s new in Xcode 16
Discover the latest productivity and performance improvements in Xcode 16. Learn about enhancements to code completion, diagnostics, and Xcode Previews. Find out more about updates in builds and explore improvements in debugging and Instruments.