coder-rust-async-concurrency

<skill_overview> Write correct, deadlock-free concurrent Rust code Spawning threads or tasks Sharing state across threads Using channels for message passing Writing async/await code The Rust Book - Concurrency The Rust Book - Async/Await </skill_overview> <message_passing> Prefer channels to avoid shared mutable state Move ownership through channels to enforce safety use std::sync::mpsc;

let (tx, rx) = mpsc::channel(); tx.send(42).unwrap(); let value = rx.recv().unwrap(); </message_passing> <shared_state> Use Arc<Mutex<T>> or Arc<RwLock<T>> for shared mutable state Keep lock scopes minimal and consistent Handle poison errors explicitly </shared_state> <send_sync> Use types that implement Send and Sync across threads Avoid Rc and RefCell in multi-threaded code </send_sync> <async_guidelines> Use async/await for I/O-bound work Do not block inside async functions Async code still needs an executor to run </async_guidelines> Lock in a consistent order Drop guards before calling into other code <anti_patterns> Using Rc<T> across threads Holding a lock across long operations Blocking I/O inside async code </anti_patterns>