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concurrency-patterns

Guide Swift concurrency patterns including async/await, actors, and Swift 6 migration.

603|51|Updated Oct 29, 2025
Search Tags:#swift 6#async/await#actors#data race#swift concurrency#structured concurrency
One-click install
npx skills add https://github.com/rshankras/claude-code-apple-skills --skill concurrency-patterns-rshankras
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: concurrency-patterns
Source: https://github.com/rshankras/claude-code-apple-skills/tree/main/skills/swift/concurrency-patterns
Command: npx skills add https://github.com/rshankras/claude-code-apple-skills --skill concurrency-patterns-rshankras

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers write robust, efficient, and safe concurrent Swift code, preventing common issues like data races and deadlocks.

Core Features & Use Cases

  • Swift Concurrency Fundamentals: Understand async/await, structured concurrency, actors, and Sendable.
  • Data Race Prevention: Learn patterns to protect shared mutable state using actors and isolation.
  • Migration to Swift 6: Provides guidance for adopting strict concurrency checking incrementally.
  • Use Case: Debugging a crash caused by a data race when multiple parts of your app try to update the same UI element simultaneously.

Quick Start

Review my Swift code for potential data races and suggest actor-based solutions.

Frequently Asked Questions about concurrency-patterns

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I prevent data races in Swift when multiple async tasks access shared mutable state?▼

Prevent data races in Swift by using actors to isolate shared mutable state. Actors serialize access to their properties, ensuring safe concurrent execution without explicit locks. This Skill provides patterns for implementing actor isolation effectively.

What is structured concurrency in Swift and when should I use it?▼

Structured concurrency in Swift organizes async tasks hierarchically, ensuring child tasks complete before parent tasks. Use it to manage task cancellation and prevent deadlocks. This Skill explains how to apply structured patterns for robust async/await code.

How do I migrate existing Swift code to strict concurrency checking in Swift 6?▼

Migrate to Swift 6 strict concurrency incrementally by adopting approachable concurrency features and addressing Sendable requirements. This Skill provides guidance on bridging legacy APIs and resolving data race errors during the transition.

Does Swift 6 support approachable concurrency for existing codebases without full rewrites?▼

Yes, Swift 6.2 supports approachable concurrency by allowing incremental adoption of strict concurrency checking. This Skill outlines how to use these features to migrate legacy code without requiring a complete rewrite.

Why does my Swift app crash when concurrent tasks update the same UI element simultaneously?▼

Your app crashes due to a data race caused by concurrent tasks updating shared state without synchronization. Resolve this by applying actor isolation patterns to serialize access. This Skill offers solutions for debugging and fixing such concurrency issues.

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