Module async_programming

Asynchronous Programming

Understanding Async/Await

Asynchronous programming allows you to write concurrent code that can handle many tasks simultaneously without blocking. Rust’s async/await syntax makes it easier to write asynchronous code that looks and feels like synchronous code.

Key Concepts:

Futures

• A Future represents a value that might not be available yet
• Futures are lazy - they don’t do anything until polled
• The Future trait is the foundation of async programming in Rust

async/await

• async functions return a Future
• await is used to wait for a Future to complete
• await can only be used inside async functions

Executors

• Executors are responsible for running futures to completion
• Popular executors: tokio, async-std, smol

Common Async Patterns

• Concurrent execution: Running multiple futures simultaneously
• Sequential execution: Waiting for one future before starting the next
• Timeouts: Setting time limits on operations
• Error handling: Dealing with errors in async contexts

Async Traits and Types

• Future: The core trait for asynchronous computation
• Stream: Asynchronous iterator
• Sink: Asynchronous writer
• AsyncRead/AsyncWrite: Asynchronous I/O traits

Structs

ComputeFuture

A custom future that yields a value after some computation

DelayFuture

A simple future that completes after a delay

Functions

async_examples

Async programming examples