//@ run-pass
#![allow(unused_must_use)]
#![allow(unused_assignments)]
//@ needs-threads

use std::sync::mpsc::{channel, Sender};
use std::thread;

pub fn main() { test00(); }

fn test00_start(c: &Sender<isize>, start: isize,
                number_of_messages: isize) {
    let mut i: isize = 0;
    while i < number_of_messages { c.send(start + i).unwrap(); i += 1; }
}

fn test00() {
    let mut r: isize = 0;
    let mut sum: isize = 0;
    let (tx, rx) = channel();
    let number_of_messages: isize = 10;

    let tx2 = tx.clone();
    let t1 = thread::spawn(move|| {
        test00_start(&tx2, number_of_messages * 0, number_of_messages);
    });
    let tx2 = tx.clone();
    let t2 = thread::spawn(move|| {
        test00_start(&tx2, number_of_messages * 1, number_of_messages);
    });
    let tx2 = tx.clone();
    let t3 = thread::spawn(move|| {
        test00_start(&tx2, number_of_messages * 2, number_of_messages);
    });
    let tx2 = tx.clone();
    let t4 = thread::spawn(move|| {
        test00_start(&tx2, number_of_messages * 3, number_of_messages);
    });

    let mut i: isize = 0;
    while i < number_of_messages {
        r = rx.recv().unwrap();
        sum += r;
        r = rx.recv().unwrap();
        sum += r;
        r = rx.recv().unwrap();
        sum += r;
        r = rx.recv().unwrap();
        sum += r;
        i += 1;
    }

    assert_eq!(sum, number_of_messages * 4 * (number_of_messages * 4 - 1) / 2);

    t1.join();
    t2.join();
    t3.join();
    t4.join();
}