what changes prevent data races in swift version 6

In Swift version 6, several changes have been introduced to prevent data races and improve concurrency safety:

1. Data Race Safety by Default: The new Swift 6 language mode achieves data race safety by default, turning all data race issues in your app into compile-time errors. This significantly improves the security of your app and reduces debugging time (What’s new in Swift).

2. Full Enforcement of Data Isolation: The Swift 6 language mode introduces full enforcement of data isolation. The compiler prevents accidental sharing of state between tasks and actors, which helps in refactoring or adding new functionality without introducing new concurrency bugs (Migrate your app to Swift 6).

3. Incremental Migration: You can adopt the Swift 6 language mode incrementally, one module at a time. This allows you to interoperate with dependencies that may not have migrated to Swift 6 yet (Platforms State of the Union).

4. Improved Data Race Checking: Swift 6 includes significant improvements to data race checking. For example, it can recognize scenarios where passing non-sendable values is safe, which would previously result in a compiler warning (What’s new in Swift).

5. New Low-Level Primitives: The synchronization module introduces new low-level primitives like atomics and mutexes. These are designed to provide efficient, lock-free implementations and ensure mutually exclusive access to shared data (What’s new in Swift).

6. Concurrency Safety Guarantees: Adopting the Swift 6 language mode in Xcode 16 allows you to take advantage of concurrency safety guarantees, turning data races into compile-time issues (What’s new in Xcode 16).

These changes collectively help in preventing data races and ensuring safer concurrent programming in Swift 6.