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Concurrency & Parallelism

Identify and mitigate concurrency bugs in Swift projects using Swift Concurrency, GCD, and actors.

1|Updated Apr 16, 2026
Search Tags:#concurrency#swift#actors#deadlocks#thread-safety#structured-concurrency
One-click install
npx skills add https://github.com/melissa-pereira-deel/creative-technologist-agent --skill concurrency-parallelism
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Concurrency & Parallelism
Source: https://github.com/melissa-pereira-deel/creative-technologist-agent/tree/main/skills/concurrency-parallelism
Command: npx skills add https://github.com/melissa-pereira-deel/creative-technologist-agent --skill concurrency-parallelism

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Concurrency bugs are non-deterministic and cause data races, deadlocks, and flaky behavior; this Skill provides guidance to design and reason about safe concurrency in Swift.

Core Features & Use Cases

  • Knowledge of Swift Concurrency concepts (async/await, actors, TaskGroup)
  • Techniques for avoiding data races, deadlocks, and priority inversion
  • Practical recommendations for structuring concurrency in UI, networking, and background tasks

Quick Start

Audit the Swift codebase for concurrency issues and propose actor-based isolation and structured concurrency fixes.

Frequently Asked Questions about Concurrency & Parallelism

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

FAQPage Schema
How do I fix data races in Swift using structured concurrency?▼

Fix data races in Swift structured concurrency by applying actor-based isolation and Sendable types. This ensures safe coordination across threads, preventing simultaneous mutable state access in UI, networking, and background tasks.

What's the best way to prevent deadlocks and priority inversion in Swift async/await code?▼

Prevent deadlocks and priority inversion in Swift async/await code by adopting structured concurrency with TaskGroup. Properly structuring background tasks avoids thread starvation and ensures safe execution across asynchronous boundaries.

When do I need @MainActor isolation in my Swift app?▼

You need @MainActor isolation in Swift when coordinating UI updates concurrently. It restricts execution to the main thread, preventing data races between background async tasks and the user interface, ensuring safe thread coordination.

How do I audit a Swift codebase for concurrency bugs and thread-safety issues?▼

Audit a Swift codebase for concurrency bugs by checking for non-Sendable types, un-isolated mutable state, and improper GCD usage. Propose fixes using actors and structured concurrency to mitigate non-deterministic data races and flaky behavior.

Does this concurrency approach work with existing GCD and background task implementations?▼

Yes, this concurrency approach works with existing GCD implementations. It provides guidance to safely coordinate multi-threaded Swift code across UI, data, and background work, ensuring thread-safety alongside both GCD and modern Swift Concurrency.

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