Rust Crossbeam

playground.rs

extern crate crossbeam;

fn main() {
    //Here we have a mutable array
    let mut data = vec![1, 2, 3];
    
    println!("{:?}", data);
    
    //With crossbeam magic we can mutate this array concurrently without locks
    //The crossbeam scope guarantees that the threads inside it will end before the scope does
    //That means it's safe to take references for our data, which must live longer than the thread
    //We couldn't guarantee this in our previous example, so we ended up with locks
    crossbeam::scope(|scope| {
        for i in &mut data {
            scope.spawn(move || {
                *i += 1;
            });
        }
    });
    
    println!("{:?}", data);
}