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task: add
JoinSet
for managing sets of tasks(#4335)
Adds `JoinSet` for managing multiple spawned tasks and joining them in completion order. Closes: #3903
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Original file line number | Diff line number | Diff line change |
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use crate::runtime::Builder; | ||
use crate::task::JoinSet; | ||
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#[test] | ||
fn test_join_set() { | ||
loom::model(|| { | ||
let rt = Builder::new_multi_thread() | ||
.worker_threads(1) | ||
.build() | ||
.unwrap(); | ||
let mut set = JoinSet::new(); | ||
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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_one().await.unwrap().unwrap(); | ||
assert_eq!(set.len(), 1); | ||
set.spawn(async { () }); | ||
assert_eq!(set.len(), 2); | ||
let () = set.join_one().await.unwrap().unwrap(); | ||
assert_eq!(set.len(), 1); | ||
let () = set.join_one().await.unwrap().unwrap(); | ||
assert_eq!(set.len(), 0); | ||
set.spawn(async { () }); | ||
assert_eq!(set.len(), 1); | ||
}); | ||
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drop(set); | ||
drop(rt); | ||
}); | ||
} | ||
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#[test] | ||
fn abort_all_during_completion() { | ||
use std::sync::{ | ||
atomic::{AtomicBool, Ordering::SeqCst}, | ||
Arc, | ||
}; | ||
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// 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)); | ||
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{ | ||
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(); | ||
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let mut set = JoinSet::new(); | ||
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rt.block_on(async { | ||
set.spawn(async { () }); | ||
set.abort_all(); | ||
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match set.join_one().await { | ||
Ok(Some(())) => complete_happened.store(true, SeqCst), | ||
Err(err) if err.is_cancelled() => cancel_happened.store(true, SeqCst), | ||
Err(err) => panic!("fail: {}", err), | ||
Ok(None) => { | ||
unreachable!("Aborting the task does not remove it from the JoinSet.") | ||
} | ||
} | ||
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assert!(matches!(set.join_one().await, Ok(None))); | ||
}); | ||
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drop(set); | ||
drop(rt); | ||
}); | ||
} | ||
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assert!(complete_happened.load(SeqCst)); | ||
assert!(cancel_happened.load(SeqCst)); | ||
} |
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