// waiting for threads in rust
// this example makes a 10 threads, saves "handle" into vector
// then waits for each handle to end
// so all thread actions are done

use std::time::Duration;
use std::thread;

fn main() {
    // make threads
    let mut handles = vec![];
    let mut cb = 20000;
    for mut j in 1..3 {
        // NOTE move so each thread independently takes ownership of of a copy of j
        handles.push(thread::spawn(move || {
            for i in 1..5 {
                cb += 10;
                println!("{} hi number {} from the spawned thread!  {}", j, i, cb);
                thread::sleep(Duration::from_millis(1));
            }
        }));
        cb += 1000;
    }
    
    for i in 1..5 {
        println!("hi number {} from the main thread!", i);
        thread::sleep(Duration::from_millis(1));
    }
    for h in handles {
        h.join().unwrap();
    }
}