golang-concurrency-patterns

Go concurrency scales when goroutine lifetimes are explicit, cancellation is propagated with context.Context, and shared state is protected (channels or locks). Apply these patterns to build reliable services and avoid common failure modes: goroutine leaks, deadlocks, and data races.

Treat goroutines as resources with a clear owner and shutdown condition.

Use errgroup.WithContext to run concurrent tasks, cancel siblings on error, and wait for completion.

実稼働サービスの Go 同時実行パターン: コンテキストのキャンセル、エラーグループ、ワーカー プール、制限された並列処理、ファンイン/ファンアウト、一般的なレース/デッドロックの落とし穴 ソース: bobmatnyc/claude-mpm-skills。