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Asked on 09/07/2024
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Threads and Concurrency in WWDC 2024
At WWDC 2024, several sessions discussed threads and concurrency, focusing on improving performance and ensuring data-race safety in applications.
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Xcode 16 Enhancements:
- The session "What’s new in Xcode 16" introduced the Thread Performance Checker, which helps identify and debug thread-related issues by pinpointing problematic code lines. This tool is particularly useful for ensuring that tasks like loading video assets are not performed on the main thread, which can degrade performance. The session also introduced the flame graph in Instruments, a visualization tool that helps identify performance bottlenecks, such as loading assets serially on the main thread. What's new in Xcode 16 (09:07)
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Swift 6 and Data-Race Safety:
- The session "Migrate your app to Swift 6" emphasized the importance of data-race safety. Swift 6 introduces compile-time checks to prevent data races, ensuring that shared mutable state is accessed safely across threads. This session also discussed the use of actors to encapsulate shared mutable state, providing a safer concurrency model. Migrate your app to Swift 6 (03:20)
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Concurrency in Swift:
- In "A Swift Tour: Explore Swift’s features and design," the session highlighted the risks of data races when multiple threads access shared memory. Swift 6's language mode ensures data-race safety by requiring shared values to be sendable, thus protecting state from concurrent access. A Swift Tour: Explore Swift’s features and design (18:33)
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Swift Language Updates:
- The session "What’s new in Swift" discussed the evolution of Swift's concurrency model, focusing on data isolation and the use of actors and sendable types to prevent data races. Swift 6 makes data-race safety a default feature, turning potential runtime issues into compile-time errors. What’s new in Swift (26:07)
These sessions collectively highlight Apple's commitment to improving concurrency handling in Swift, making applications more robust and performant by default.
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.
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.