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use crate::runtime::Builder;
use crate::task::JoinSet;
#[test]
fn test_join_set() {
loom::model(|| {
let rt = Builder::new_multi_thread()
.worker_threads(1)
.build()
.unwrap();
let mut set = JoinSet::new();
rt.block_on(async {
assert_eq!(set.len(), 0);
set.spawn(async { () });
assert_eq!(set.len(), 1);
set.spawn(async { () });
assert_eq!(set.len(), 2);
let () = set.join_next().await.unwrap().unwrap();
assert_eq!(set.len(), 1);
set.spawn(async { () });
assert_eq!(set.len(), 2);
let () = set.join_next().await.unwrap().unwrap();
assert_eq!(set.len(), 1);
let () = set.join_next().await.unwrap().unwrap();
assert_eq!(set.len(), 0);
set.spawn(async { () });
assert_eq!(set.len(), 1);
});
drop(set);
drop(rt);
});
}
#[test]
fn abort_all_during_completion() {
use std::sync::{
atomic::{AtomicBool, Ordering::SeqCst},
Arc,
};
// These booleans assert that at least one execution had the task complete first, and that at
// least one execution had the task be cancelled before it completed.
let complete_happened = Arc::new(AtomicBool::new(false));
let cancel_happened = Arc::new(AtomicBool::new(false));
{
let complete_happened = complete_happened.clone();
let cancel_happened = cancel_happened.clone();
loom::model(move || {
let rt = Builder::new_multi_thread()
.worker_threads(1)
.build()
.unwrap();
let mut set = JoinSet::new();
rt.block_on(async {
set.spawn(async { () });
set.abort_all();
match set.join_next().await {
Some(Ok(())) => complete_happened.store(true, SeqCst),
Some(Err(err)) if err.is_cancelled() => cancel_happened.store(true, SeqCst),
Some(Err(err)) => panic!("fail: {}", err),
None => {
unreachable!("Aborting the task does not remove it from the JoinSet.")
}
}
assert!(matches!(set.join_next().await, None));
});
drop(set);
drop(rt);
});
}
assert!(complete_happened.load(SeqCst));
assert!(cancel_happened.load(SeqCst));
}