Counter in a loop in the same process and thread

• This simple examples shows how we can change a variable from multiple threads
• This is the example without any threads:

fn main() {
    let limit = 10_000_000;

    let result = count_in_process(limit);
    println!("{}", result);
    assert_eq!(result, limit);
}

fn count_in_process(limit: i32) -> i32 {
    let mut counter = 0;
    for _ in 0..limit {
        counter += 1;
    }

    counter
}

10000000