rust-async-patterns

Async/await in Rust lets you write non-blocking concurrent code that suspends execution without threads. Use the tokio runtime to schedule async functions, enabling multiple I/O operations to overlap efficiently on a single or multi-threaded executor.

Spawn concurrent HTTP requests using tokio tasks with reqwest, the async HTTP client. Collect futures with join_all or similar combinators to await all requests simultaneously, reducing total latency compared to sequential requests.

Tokio offers configurable runtimes: single-threaded for lighter workloads or multi-threaded for CPU-bound and I/O tasks. Choose based on your concurrency needs and spawn tasks or block_on async code within the runtime context.

Yes. Tokio channels enable safe message passing between spawned tasks, while streams represent async iteration over data. Combine them to build concurrent pipelines where tasks communicate and process data flows asynchronously.

Tokio provides async-aware synchronization primitives: Mutex for critical sections, RwLock for read-write access, Semaphore for resource limiting, and Barrier for task coordination—all designed to avoid blocking the executor during lock contention.

Use Result types in async functions and propagate errors with ?. Tokio JoinHandles yield Results; use select! or timeout to cancel tasks. Futures can be aborted via dropping handles, and task-local storage manages cancellation scopes.