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Rust
Threads with thread::spawn + join
Native OS threads with `std::thread::spawn`. The returned `JoinHandle` lets you wait for the thread and get its return value. Use `move` to transfer ownership of captured variables.
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Rust
mpsc Channel Between Threads
`std::sync::mpsc` is the standard cross-thread channel. Multiple producers, single consumer. Send any `Send` type; the receiver blocks on `recv()` until something arrives.
Rust
Atomic Counter (lock-free)
For shared counters and flags, `AtomicU64` / `AtomicBool` etc. are much faster than `Mutex`. Operations like `fetch_add` are single CPU instructions on most architectures.