rust/src/test/run-pass/task-comm-15.rs

// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// ignore-emscripten no threads support
// pretty-expanded FIXME #23616

#![feature(std_misc)]

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

fn start(tx: &Sender<isize>, i0: isize) {
    let mut i = i0;
    while i > 0 {
        tx.send(0).unwrap();
        i = i - 1;
    }
}

pub fn main() {
    // Spawn a thread that sends us back messages. The parent thread
    // is likely to terminate before the child completes, so from
    // the child's point of view the receiver may die. We should
    // drop messages on the floor in this case, and not crash!
    let (tx, rx) = channel();
    let t = thread::spawn(move|| {
        start(&tx, 10)
    });
    rx.recv();
    t.join();
}