swift-concurrency-6-2

Prevent data races in Swift 6.2 by defaulting to single-threaded execution and requiring explicit concurrency choices. This MainActor-centric architecture reduces data-race risk by making background offloading an opt-in action using @concurrent.

MainActor default inference is an opt-in Swift concurrency mechanism that assumes code runs on the main thread by default. It reduces boilerplate while preserving single-threaded safety until you explicitly offload work to background tasks.

Migrate to Swift 6.2 concurrency by first enabling MainActor default inference in your app targets. Then gradually migrate code paths to single-threaded execution before selectively adding explicit @concurrent attributes for background tasks.

Use isolated conformances in Swift when building a MainActor-centric architecture to ensure safe concurrency. They provide safer architecture boundaries by keeping protocol conformances single-threaded by default, requiring explicit opt-in for parallelism.

Yes, Swift 6.2 requires explicit concurrency choices for background tasks to prevent data races. You must use opt-in @concurrent attributes for background offloading instead of relying on implicit offloading.

The limitation of single-threaded Swift execution is that all background work requires explicit @concurrent annotations. This MainActor-centric approach reduces implicit parallelism, meaning you must manually identify and annotate performance-critical background tasks.