Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/third_party/rust/tokio-util/tests/poll_semaphore.rs b/third_party/rust/tokio-util/tests/poll_semaphore.rs
new file mode 100644
index 0000000000..50f36dd803
--- /dev/null
+++ b/third_party/rust/tokio-util/tests/poll_semaphore.rs
@@ -0,0 +1,36 @@
+use std::future::Future;
+use std::sync::Arc;
+use std::task::Poll;
+use tokio::sync::{OwnedSemaphorePermit, Semaphore};
+use tokio_util::sync::PollSemaphore;
+
+type SemRet = Option<OwnedSemaphorePermit>;
+
+fn semaphore_poll(
+    sem: &mut PollSemaphore,
+) -> tokio_test::task::Spawn<impl Future<Output = SemRet> + '_> {
+    let fut = futures::future::poll_fn(move |cx| sem.poll_acquire(cx));
+    tokio_test::task::spawn(fut)
+}
+
+#[tokio::test]
+async fn it_works() {
+    let sem = Arc::new(Semaphore::new(1));
+    let mut poll_sem = PollSemaphore::new(sem.clone());
+
+    let permit = sem.acquire().await.unwrap();
+    let mut poll = semaphore_poll(&mut poll_sem);
+    assert!(poll.poll().is_pending());
+    drop(permit);
+
+    assert!(matches!(poll.poll(), Poll::Ready(Some(_))));
+    drop(poll);
+
+    sem.close();
+
+    assert!(semaphore_poll(&mut poll_sem).await.is_none());
+
+    // Check that it is fused.
+    assert!(semaphore_poll(&mut poll_sem).await.is_none());
+    assert!(semaphore_poll(&mut poll_sem).await.is_none());
+}