What's new in Swift Concurrency

Asked on 03/03/2025

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In the "What's new in Swift" session at WWDC 2024, several updates to Swift Concurrency were highlighted:

  1. 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.

  2. 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.

  3. 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.

  4. 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.

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What’s new in Swift

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.

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