40 lines
795 B
Rust
40 lines
795 B
Rust
//@ run-pass
|
|
#![allow(unused_parens)]
|
|
//@ needs-threads
|
|
|
|
use std::sync::mpsc::{channel, Sender};
|
|
use std::thread;
|
|
|
|
pub fn main() {
|
|
let (tx, rx) = channel();
|
|
|
|
// Spawn 10 threads each sending us back one isize.
|
|
let mut i = 10;
|
|
while (i > 0) {
|
|
println!("{}", i);
|
|
let tx = tx.clone();
|
|
thread::spawn({
|
|
let i = i;
|
|
move || child(i, &tx)
|
|
});
|
|
i = i - 1;
|
|
}
|
|
|
|
// Spawned threads are likely killed before they get a chance to send
|
|
// anything back, so we deadlock here.
|
|
|
|
i = 10;
|
|
while (i > 0) {
|
|
println!("{}", i);
|
|
rx.recv().unwrap();
|
|
i = i - 1;
|
|
}
|
|
|
|
println!("main thread exiting");
|
|
}
|
|
|
|
fn child(x: isize, tx: &Sender<isize>) {
|
|
println!("{}", x);
|
|
tx.send(x).unwrap();
|
|
}
|