#[macro_use]
extern crate lazy_static;

use std::sync::{Arc, Mutex};
use std::thread;
use std::thread::sleep_ms;

lazy_static! {
    static ref V: Vec<u32> = {
        let mut v = Vec::new();
        for i in 0..1_000_000 {
            v.push(i);
        }
        v
    };
}

fn main() {
    let a = Arc::new(Mutex::new(V.iter()));
    let mut threads = Vec::new();
    for _ in 0..4 {
        let a = a.clone();
        threads.push(thread::spawn(move || {
            /*while let Some(val) = a.lock().unwrap().next() {
                sleep_ms(1000);
                println!("{}", val);
            }*/
            loop {
                let step = a.lock().unwrap().next();
                match step {
                    Some(val) => {
                        sleep_ms(1000);
                        println!("{}", val);
                    },
                    None => break
                }
            }
        }));
    }
    for th in threads.into_iter() {
        th.join();
    }
}