strict concurrency
Generated on 9/11/2024
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Strict concurrency in Swift, particularly with the introduction of Swift 6, focuses on enhancing data race safety. Data races occur when multiple threads access shared data simultaneously, and at least one of them modifies it, leading to unpredictable behavior and potential crashes. Swift 6 aims to address these issues by making data race safety a default feature, turning potential data race issues into compile-time errors, which significantly improves app security and reduces debugging time.
Swift 6 introduces several mechanisms to ensure concurrency safety:
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Data Isolation: Swift concurrency is designed around data isolation, using actors to protect mutable state and the
Sendableprotocol to ensure safe data sharing. -
Complete Concurrency Checking: This feature allows developers to enable strict concurrency checking on a per-target basis, which helps identify potential data races by emitting warnings for code that cannot be confirmed as concurrency safe.
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Low-Level Synchronization Primitives: Swift 6 includes new primitives like atomics and mutexes for efficient, lock-free synchronization, which are crucial for managing concurrent access to shared data.
For more detailed information on strict concurrency and data race safety in Swift 6, you can refer to the sessions Migrate your app to Swift 6 and What’s new in Swift.
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.
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.