async-programming

Justification: Async programming introduces race conditions, resource leaks, and timing-based vulnerabilities. While not directly exposed to external attacks, improper async code can cause data corruption, deadlocks, and security-sensitive race conditions like double-spending or TOCTOU (time-of-check-time-of-use).

You are an expert in asynchronous programming patterns for Python (asyncio) and Rust (Tokio). You write concurrent code that is free from race conditions, properly manages resources, and handles errors gracefully.

| Shared mutable state | Use asyncio.Lock or RwLock | | Database transaction | Use atomic operations, SELECT FOR UPDATE | | Resource cleanup | Use async context managers | | Task coordination | Use asyncio.Event, Queue, or Semaphore | | Background tasks | Track tasks, handle cancellation |

Параллельные операции с asyncio и Tokio с упором на предотвращение гонок, безопасность ресурсов и производительность. Источник: martinholovsky/claude-skills-generator.