Systems

From binary heap to hierarchical timer wheel

Demystifying Tokio's Timer Wheel: How Async Rust Keeps Time at Scale

A deep-dive learning journal tracing a single tokio::time::sleep() from registration to wakeup, and how Tokio achieves O(1) timer management with bitwise math, intrusive lists, and cooperative drivers.

What I Got Wrong About Wakers: Building an Async Executor in Rust

Building a custom Rust async runtime from scratch reveals why preemptive mindsets break cooperative executors and how Wakers actually target the correct OS thread.