Coordination in rust

coordination.rs

// High coordination: Mutex — consistent, slower
let counter = Arc::new(Mutex::new(0));
{
    let mut c = counter.lock().unwrap();  // Wait for lock
    *c += 1;
}

// Less coordination: Atomic — faster, limited operations
let counter = AtomicU64::new(0);
counter.fetch_add(1, Ordering::Relaxed);  // No waiting

// Even less: per-thread counters, merge later
thread_local! { static COUNT: Cell<u64> = Cell::new(0); }
// Fast, but only eventually consistent