src/test/run-pass/preempt.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-test
  12 // This checks that preemption works.
  13
  14 // note: halfway done porting to modern rust
  15 use std::comm;
  16
  17 fn starve_main(alive: Receiver<isize>) {
  18     println!("signalling main");
  19     alive.recv();
  20     println!("starving main");
  21     let mut i: isize = 0;
  22     loop { i += 1; }
  23 }
  24
  25 pub fn main() {
  26     let (port, chan) = stream();
  27
  28     println!("main started");
  29     spawn(move|| {
  30         starve_main(port);
  31     });
  32     let mut i: isize = 0;
  33     println!("main waiting for alive signal");
  34     chan.send(i);
  35     println!("main got alive signal");
  36     while i < 50 { println!("main iterated"); i += 1; }
  37     println!("main completed");
  38 }