ClaudSkills / Engineering / engineering-misc

Gcd Operations

Quality score: 70/100 · Category: Engineering · Sub-category: engineering-misc

Use for iOS/macOS concurrency problems involving dispatch queues, locks, or thread safety. Triggers on: deadlocks (sync on main, nested sync, ABBA lock ordering), thread explosion from too many DispatchQueue.global() calls, data races flagged by Thread Sanitizer (TSan), DispatchGroup enter/leave imbalance, DispatchSource timer leaks, lock selection (NSLock vs OSAllocatedUnfairLock vs os_unfair_lock), reader-writer barriers, AsyncOperation subclasses, dispatchPrecondition usage, and OperationQueue throttling. Also use when migrating GCD patterns to Swift Concurrency actors. Apply whenever someone asks about thread-safe properties, concurrent access to shared state, or sees TSan warnings in Apple platform code — even if they don't say 'GCD' or 'concurrency.

What this skill does

Gcd Operations is a production-ready Claude Code skill (quality score 70/100) in the engineering-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/gcd-operations/ and loads when your prompt matches the skill's trigger.

When to invoke it: use when migrating GCD patterns to Swift Concurrency actors. Apply whenever someone asks about thread-safe properties, concurrent access to shared state, or sees TSan warnings in Apple platform code — even if they don't say 'GCD' or 'concurrency.

Who uses this skill

The Gcd Operations skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/gcd-operations
curl -L https://claudskills.com/skills/gcd-operations/SKILL.md \
  -o ~/.claude/skills/gcd-operations/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/gcd-operations/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/gcd-operations/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\gcd-operations\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

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