Rust by Example

18.1 Threads

Rust provides a mechanism for spawning native OS threads via the spawn function, the argument of this function is a moving closure.

use std::thread;

static NTHREADS: i32 = 10;

// This is the `main` thread
fn main() {
    // Make a vector to hold the children which are spawned.
    let mut children = vec![];

    for i in 0..NTHREADS {
        // Spin up another thread
        children.push(thread::spawn(move || {
            println!("this is thread number {}", i)

    for child in children {
        // Wait for the thread to finish. Returns a result.
        let _ = child.join();

These threads will be scheduled by the OS.