Summary

Summary

Chapter Key Takeaways

• Futures are poll-driven state machines executed by a runtime.
• Tokio provides a work-stealing multithreaded async runtime.
• Pin prevents memory moves of self-referential generator frames.
• Async code avoids thread exhaustion on high-concurrency I/O workloads.
• Dropping a future cancels it at its current .await: race only cancel-safe operations in select! and timeout, and keep progress outside futures that may be dropped.