src/test/run-pass/task-comm-14.rs

   1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // ignore-emscripten no threads support
  12
  13 #![feature(std_misc)]
  14
  15 use std::sync::mpsc::{channel, Sender};
  16 use std::thread;
  17
  18 pub fn main() {
  19     let (tx, rx) = channel();
  20
  21     // Spawn 10 threads each sending us back one isize.
  22     let mut i = 10;
  23     while (i > 0) {
  24         println!("{}", i);
  25         let tx = tx.clone();
  26         thread::spawn({let i = i; move|| { child(i, &tx) }});
  27         i = i - 1;
  28     }
  29
  30     // Spawned threads are likely killed before they get a chance to send
  31     // anything back, so we deadlock here.
  32
  33     i = 10;
  34     while (i > 0) {
  35         println!("{}", i);
  36         rx.recv().unwrap();
  37         i = i - 1;
  38     }
  39
  40     println!("main thread exiting");
  41 }
  42
  43 fn child(x: isize, tx: &Sender<isize>) {
  44     println!("{}", x);
  45     tx.send(x).unwrap();
  46 }