Rust 82 🦀 Async Runtimes Architecture (Tokio and async-std)
Rust’s language-level async model stops at the Future trait. Everything that actually makes futures run—the task queues, the worker threads, the I/O event loop, the timer wheel—lives in external crates. Two runtimes dominate the conversation: Tokio, the ecosystem’s de facto standard, and async-std, a design that mirrors the standard library’s API. They share the same…