Tokio is an asynchronous runtime for the Rust programming language, and it is more than just thread pools. Here's a brief overview of how Tokio is implemented:
-
Event Loop: Tokio uses an event-driven architecture, leveraging an event loop to manage tasks and I/O events. The core of Tokio's runtime is the
mio
library, which provides a low-level event loop backed by OS-specific mechanisms like epoll (Linux), kqueue (BSD), and IOCP (Windows). -
Futures and Tasks: Tokio's concurrency model is based on Rust's
Future
trait. Tasks are units of work that implement theFuture
trait, and they are polled by the runtime to make progress. When a task is not ready to make progress (e.g., waiting for I/O), it yields control back to the runtime. -
Thread Pool: