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#![cfg(all(feature = "async", not(loom)))]
use core::mem;
use core::time::Duration;
mod helpers;
use helpers::DropCounter;
#[tokio::test]
async fn send_before_await_tokio() {
let (sender, receiver) = oneshot::channel();
assert!(sender.send(19i128).is_ok());
assert_eq!(receiver.await, Ok(19i128));
}
#[async_std::test]
async fn send_before_await_async_std() {
let (sender, receiver) = oneshot::channel();
assert!(sender.send(19i128).is_ok());
assert_eq!(receiver.await, Ok(19i128));
}
#[tokio::test]
async fn await_with_dropped_sender_tokio() {
let (sender, receiver) = oneshot::channel::<u128>();
mem::drop(sender);
receiver.await.unwrap_err();
}
#[async_std::test]
async fn await_with_dropped_sender_async_std() {
let (sender, receiver) = oneshot::channel::<u128>();
mem::drop(sender);
receiver.await.unwrap_err();
}
#[tokio::test]
async fn await_before_send_tokio() {
let (sender, receiver) = oneshot::channel();
let (message, counter) = DropCounter::new(79u128);
let t = tokio::spawn(async move {
tokio::time::sleep(Duration::from_millis(10)).await;
sender.send(message)
});
let returned_message = receiver.await.unwrap();
assert_eq!(counter.count(), 0);
assert_eq!(*returned_message.value(), 79u128);
mem::drop(returned_message);
assert_eq!(counter.count(), 1);
t.await.unwrap().unwrap();
}
#[async_std::test]
async fn await_before_send_async_std() {
let (sender, receiver) = oneshot::channel();
let (message, counter) = DropCounter::new(79u128);
let t = async_std::task::spawn(async move {
async_std::task::sleep(Duration::from_millis(10)).await;
sender.send(message)
});
let returned_message = receiver.await.unwrap();
assert_eq!(counter.count(), 0);
assert_eq!(*returned_message.value(), 79u128);
mem::drop(returned_message);
assert_eq!(counter.count(), 1);
t.await.unwrap();
}
#[tokio::test]
async fn await_before_send_then_drop_sender_tokio() {
let (sender, receiver) = oneshot::channel::<u128>();
let t = tokio::spawn(async {
tokio::time::sleep(Duration::from_millis(10)).await;
mem::drop(sender);
});
assert!(receiver.await.is_err());
t.await.unwrap();
}
#[async_std::test]
async fn await_before_send_then_drop_sender_async_std() {
let (sender, receiver) = oneshot::channel::<u128>();
let t = async_std::task::spawn(async {
async_std::task::sleep(Duration::from_millis(10)).await;
mem::drop(sender);
});
assert!(receiver.await.is_err());
t.await;
}
// Tests that the Receiver handles being used synchronously even after being polled
#[tokio::test]
async fn poll_future_and_then_try_recv() {
use core::future::Future;
use core::pin::Pin;
use core::task::{self, Poll};
struct StupidReceiverFuture(oneshot::Receiver<()>);
impl Future for StupidReceiverFuture {
type Output = Result<(), oneshot::RecvError>;
fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
let poll_result = Future::poll(Pin::new(&mut self.0), cx);
self.0.try_recv().expect_err("Should never be a message");
poll_result
}
}
let (sender, receiver) = oneshot::channel();
let t = tokio::spawn(async {
tokio::time::sleep(Duration::from_millis(20)).await;
mem::drop(sender);
});
StupidReceiverFuture(receiver).await.unwrap_err();
t.await.unwrap();
}
#[tokio::test]
async fn poll_receiver_then_drop_it() {
let (sender, receiver) = oneshot::channel::<()>();
// This will poll the receiver and then give up after 100 ms.
tokio::time::timeout(Duration::from_millis(100), receiver)
.await
.unwrap_err();
// Make sure the receiver has been dropped by the runtime.
assert!(sender.send(()).is_err());
}
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