Understanding Async Await in Rust: From State Machines to Assembly Code
This article will explore the inner workings of async await in Rust. We will examine how async functions are implemented as state machines and how they are converted to assembly code. Rust's async functions provide a mechanism for writing asynchronous code using a synchronous style. These functions are implemented as state machines, which are enums implementing the Future trait. The Future trait is a trait with a poll method that is repeatedly called until it returns Poll::Ready. The poll method is a state machine that moves between states until it reaches the final state, which returns Poll::Ready. We will use an example async function to help illustrate these concepts.
We recommend reading the "Rust Closures Under the Hood: Comparing impl Fn and Box<dyn Fn>" to understand the inner workings of closures in Rust. Closures are used in async functions to capture variables from the enclosing scope.
Learn how high-level constructs translate into efficient assembly code. Dive into dynamic dispatch, trait inheritance, and async programming internals.
