use std;
import std::task;

fn main() { test00(); }

fn test00_start(c: chan[int], start: int, number_of_messages: int) {
    let i: int = 0;
    while i < number_of_messages { c <| start + i; i += 1; }
}

fn test00() {
    let r: int = 0;
    let sum: int = 0;
    let p: port[int] = port();
    let number_of_messages: int = 10;

    let t0: task =
        spawn test00_start(chan(p), number_of_messages * 0,
                           number_of_messages);
    let t1: task =
        spawn test00_start(chan(p), number_of_messages * 1,
                           number_of_messages);
    let t2: task =
        spawn test00_start(chan(p), number_of_messages * 2,
                           number_of_messages);
    let t3: task =
        spawn test00_start(chan(p), number_of_messages * 3,
                           number_of_messages);

    let i: int = 0;
    while i < number_of_messages {
        p |> r;
        sum += r;
        p |> r;
        sum += r;
        p |> r;
        sum += r;
        p |> r;
        sum += r;
        i += 1;
    }

    task::join(t0);
    task::join(t1);
    task::join(t2);
    task::join(t3);

    assert (sum == number_of_messages * 4 * (number_of_messages * 4 - 1) / 2);
}