Cancel Async Tasks

概要

This skill provides specialized guidance for managing the complex lifecycle of asynchronous Python tasks, specifically focusing on reliable cancellation and signal propagation. It addresses common challenges like handling SIGINT/KeyboardInterrupt within asyncio event loops, managing semaphore-based concurrency limits, and ensuring that all tasks—including those queued or waiting on I/O—are properly cleaned up. By following these patterns, developers can avoid resource leaks and ensure their concurrent applications terminate gracefully under various interrupt scenarios, whether using modern TaskGroups or manual task management.

主な機能

• Guidance for signal propagation (SIGINT/SIGTERM) within asyncio event loops
• Cleanup strategies for running, awaiting, and semaphore-queued tasks
• 16 GitHub stars
• Implementation patterns for TaskGroups, manual task tracking, and signal handlers
• Robust verification strategies using real signals and subprocess testing
• Identification and mitigation of common pitfalls like unawaited cancelled tasks

ユースケース

• Implementing concurrent task runners that require graceful shutdown upon user interruption
• Managing resource cleanup for high-concurrency Python applications using semaphores
• Developing CLI tools that need to handle Ctrl+C without leaving orphaned processes