actors
Generated on 8/12/2024
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Actors in Swift are a feature designed to help manage concurrency by encapsulating shared mutable state and ensuring that only one task can access that state at a time. This is achieved by serializing accesses to the actor's state, making calls to actor methods from outside the actor's context asynchronous. This feature is particularly useful for preventing data races in concurrent programming.
In the session titled "A Swift Tour: Explore Swift’s features and design" at WWDC 2024, actors are discussed as a way to make concurrent accesses safe by synchronizing them. This is demonstrated with an example of making a userstore an actor to handle HTTP request handlers safely.
Additionally, in the session "Migrate your app to Swift 6," actors are mentioned in the context of isolating methods to the main actor to ensure data-race safety. The session discusses using the mainactor assume isolated method to inform the compiler that certain code is already running on the main actor, which helps prevent race conditions.
For more detailed information, you can refer to the following sessions:
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.
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.