1use rayon::prelude::*;
2use rayon::ThreadPoolBuilder;
3
4#[test]
5#[cfg_attr(any(target_os = "emscripten", target_family = "wasm"), ignore)]
6fn cross_pool_busy() {
7 let pool1 = ThreadPoolBuilder::new().num_threads(1).build().unwrap();
8 let pool2 = ThreadPoolBuilder::new().num_threads(1).build().unwrap();
9
10 let n: i32 = 100;
11 let sum: i32 = pool1.install(move || {
12 // Each item will block on pool2, but pool1 can continue processing other work from the
13 // parallel iterator in the meantime. There's a chance that pool1 will still be awake to
14 // see the latch set without being tickled, and then it will drop that stack job. The latch
15 // internals must not assume that the job will still be alive after it's set!
16 (1..=n)
17 .into_par_iter()
18 .map(|i| pool2.install(move || i))
19 .sum()
20 });
21 assert_eq!(sum, n * (n + 1) / 2);
22}
23