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use futures::channel::{mpsc, oneshot};
use futures::executor::{block_on, block_on_stream};
use futures::sink::SinkExt;
use futures::stream::StreamExt;
use std::sync::mpsc as std_mpsc;
use std::thread;
#[test]
fn works() {
const N: usize = 4;
let (mut tx, rx) = mpsc::channel(1);
let (tx2, rx2) = std_mpsc::channel();
let (tx3, rx3) = std_mpsc::channel();
let t1 = thread::spawn(move || {
for _ in 0..=N {
let (mytx, myrx) = oneshot::channel();
block_on(tx.send(myrx)).unwrap();
tx3.send(mytx).unwrap();
}
rx2.recv().unwrap();
for _ in 0..N {
let (mytx, myrx) = oneshot::channel();
block_on(tx.send(myrx)).unwrap();
tx3.send(mytx).unwrap();
}
});
let (tx4, rx4) = std_mpsc::channel();
let t2 = thread::spawn(move || {
for item in block_on_stream(rx.buffer_unordered(N)) {
tx4.send(item.unwrap()).unwrap();
}
});
let o1 = rx3.recv().unwrap();
let o2 = rx3.recv().unwrap();
let o3 = rx3.recv().unwrap();
let o4 = rx3.recv().unwrap();
assert!(rx4.try_recv().is_err());
o1.send(1).unwrap();
assert_eq!(rx4.recv(), Ok(1));
o3.send(3).unwrap();
assert_eq!(rx4.recv(), Ok(3));
tx2.send(()).unwrap();
o2.send(2).unwrap();
assert_eq!(rx4.recv(), Ok(2));
o4.send(4).unwrap();
assert_eq!(rx4.recv(), Ok(4));
let o5 = rx3.recv().unwrap();
let o6 = rx3.recv().unwrap();
let o7 = rx3.recv().unwrap();
let o8 = rx3.recv().unwrap();
let o9 = rx3.recv().unwrap();
o5.send(5).unwrap();
assert_eq!(rx4.recv(), Ok(5));
o8.send(8).unwrap();
assert_eq!(rx4.recv(), Ok(8));
o9.send(9).unwrap();
assert_eq!(rx4.recv(), Ok(9));
o7.send(7).unwrap();
assert_eq!(rx4.recv(), Ok(7));
o6.send(6).unwrap();
assert_eq!(rx4.recv(), Ok(6));
t1.join().unwrap();
t2.join().unwrap();
}