forked from mirrors/gecko-dev
46156fb100
At the same time, update mdns_service to socket2 0.4 to avoid a duplicate. Differential Revision: https://phabricator.services.mozilla.com/D147479
36 lines
1,022 B
Rust
36 lines
1,022 B
Rust
use std::future::Future;
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use std::sync::Arc;
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use std::task::Poll;
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use tokio::sync::{OwnedSemaphorePermit, Semaphore};
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use tokio_util::sync::PollSemaphore;
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type SemRet = Option<OwnedSemaphorePermit>;
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fn semaphore_poll(
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sem: &mut PollSemaphore,
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) -> tokio_test::task::Spawn<impl Future<Output = SemRet> + '_> {
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let fut = futures::future::poll_fn(move |cx| sem.poll_acquire(cx));
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tokio_test::task::spawn(fut)
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}
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#[tokio::test]
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async fn it_works() {
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let sem = Arc::new(Semaphore::new(1));
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let mut poll_sem = PollSemaphore::new(sem.clone());
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let permit = sem.acquire().await.unwrap();
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let mut poll = semaphore_poll(&mut poll_sem);
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assert!(poll.poll().is_pending());
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drop(permit);
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assert!(matches!(poll.poll(), Poll::Ready(Some(_))));
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drop(poll);
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sem.close();
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assert!(semaphore_poll(&mut poll_sem).await.is_none());
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// Check that it is fused.
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assert!(semaphore_poll(&mut poll_sem).await.is_none());
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assert!(semaphore_poll(&mut poll_sem).await.is_none());
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}
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