what's new on swift concurrency ?

Swift concurrency has seen several updates and improvements, particularly with the introduction of Swift 6. Here are some of the key changes and new features:

1. Data Race Safety:

   • Swift 6 introduces data race safety by default, turning potential data race issues into compile-time errors. This significantly improves the security and reliability of concurrent code (What’s new in Swift).
   • The new language mode in Swift 6 ensures complete data race safety, which was progressively built upon the foundations laid by async/await, structured concurrency, and actors (Platforms State of the Union).

2. Concurrency Model Enhancements:

   • Swift 6 continues to refine the concurrency model introduced in previous versions, including async/await and actors. These features help manage concurrent tasks more safely and efficiently (What’s new in Swift).

3. Improved Concurrency Checking:

   • Swift 5.10 introduced complete concurrency checking, and Swift 6 builds on this by recognizing safe scenarios for passing non-sendable values across actor isolation boundaries (What’s new in Swift).

4. Low-Level Synchronization Primitives:

   • The synchronization module in Swift 6 introduces atomics and mutexes, which provide efficient, lock-free implementations for safe concurrent access (What’s new in Swift).

5. Migration to Swift 6:

   • The process of migrating to Swift 6 involves enabling the new language mode and ensuring that your codebase is free from data races. This can be done incrementally, module by module, and even allows interoperability with dependencies that haven't yet migrated (Migrate your app to Swift 6).

For a detailed walkthrough on enabling Swift 6 and adopting its concurrency features, you can refer to the session Migrate your app to Swift 6.