Rust Async

Asynchronous programming in Rust allows for non-blocking I/O and concurrent execution within a single thread or across a thread pool, optimized for high-throughput tasks.

Core Concepts

• Future: A trait representing a value that might not be available yet. It must be polled to make progress.
• async: A keyword used to define a block of code or a function that returns a Future.
• .await: Pauses the execution of the current async function until the Future is resolved, yielding control back to the executor.

Execution Model

Rust does not include a built-in async runtime.

• Executors: Libraries (like Tokio or async-std) that poll futures until completion.
• Cooperative Multitasking: Async tasks yield control voluntarily at .await points.

Pinning

Because async functions are transformed into state machines that can hold self-referential pointers, Rust uses the Pin type to ensure that futures do not move in memory while they are being polled.

References

• Source: 00_Raw/the-rust-programming-language.md
• rust-moc
• rust-concurrency