foo.rs

use std::thread;
use std::rt;
use std::sync::mpsc::channel;

fn main() {
    let (tx1, rx1) = channel();
    let (tx2, rx2) = channel();
    rt::at_exit(move || {
        tx1.send(());
        rx2.recv();
    });
    thread::spawn(move || {
        rx1.recv();
        println!("hello!");
        tx2.send(());
    });
}