what's new on concurrency?
Asked on 07/30/2024
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What's New in Concurrency at WWDC 2024
Swift 6 and Data-Race Safety
One of the significant updates in concurrency is the introduction of data-race safety by default in Swift 6. This means that all data race issues in your app will be turned into compile-time errors, significantly improving the security and stability of your applications. This feature is part of the new Swift 6 language mode, which you can adopt module by module to ensure a smooth transition (What’s new in Swift).
Low-Level Synchronization Primitives
Swift 6 also introduces new low-level synchronization primitives in the synchronization module, such as atomics and mutexes. These primitives provide efficient, lock-free implementations and ensure safe concurrent access to shared data (What’s new in Swift).
Migration to Swift 6
The session "Migrate your app to Swift 6" provides a hands-on tutorial on how to update your app to take advantage of these new concurrency features. It covers enabling complete concurrency checking, which helps catch concurrency issues at compile time, and provides strategies for incrementally adopting these features in your codebase (Migrate your app to Swift 6).
Practical Examples
In practice, adopting Swift 6's concurrency features involves updating your code to use actors for protecting mutable state and ensuring that all data sharing is safe. The session also discusses common issues you might encounter, such as dealing with modules that haven't been updated for Swift concurrency yet (Migrate your app to Swift 6).
Xcode 16 Support
Xcode 16 supports these new concurrency features and provides tools to help you adopt them. You can start by enabling warnings for upcoming language features in the build settings, which helps you prepare your code for Swift 6 (What’s new in Xcode 16).
Relevant Sessions
These sessions provide a comprehensive overview of the new concurrency features in Swift 6 and practical guidance on how to adopt them in your projects.
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.
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.
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.