tests/ui/threads-sendsync/task-comm-10.rs

   1 // run-pass
   2 #![allow(unused_must_use)]
   3 #![allow(unused_mut)]
   4 // ignore-emscripten no threads support
   5
   6 use std::thread;
   7 use std::sync::mpsc::{channel, Sender};
   8
   9 fn start(tx: &Sender<Sender<String>>) {
  10     let (tx2, rx) = channel();
  11     tx.send(tx2).unwrap();
  12
  13     let mut a;
  14     let mut b;
  15     a = rx.recv().unwrap();
  16     assert_eq!(a, "A".to_string());
  17     println!("{}", a);
  18     b = rx.recv().unwrap();
  19     assert_eq!(b, "B".to_string());
  20     println!("{}", b);
  21 }
  22
  23 pub fn main() {
  24     let (tx, rx) = channel();
  25     let child = thread::spawn(move|| { start(&tx) });
  26
  27     let mut c = rx.recv().unwrap();
  28     c.send("A".to_string()).unwrap();
  29     c.send("B".to_string()).unwrap();
  30     thread::yield_now();
  31
  32     child.join();
  33 }