Rust Essentials - Second Edition

Starting a number of threads

Each thread has its own stack and local state, and by default no data is shared between threads unless it is immutable data. Generating threads is a very lightweight process; for example, starting tens of thousands of threads only takes a few seconds. The following program does just that, and prints out the numbers 0 to 9,999:

// code from Chapter 9/code/many_threads.rs: use std::thread; static NTHREADS: i32 = 10000; fn main() { println!("************************** Before the start of the threads"); for i in 0..NTHREADS { let _ = thread::spawn(move || { println!("this is thread number {}", i) }); } thread::sleep(time::Duration::from_millis(500)); println!("************************** All threads finished!"); } ...