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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/once_cell/examples/test_synchronization.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
Deleted vendor folder
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-rw-r--r--vendor/once_cell/examples/test_synchronization.rs38
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diff --git a/vendor/once_cell/examples/test_synchronization.rs b/vendor/once_cell/examples/test_synchronization.rs
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--- a/vendor/once_cell/examples/test_synchronization.rs
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-//! Test if the OnceCell properly synchronizes.
-//! Needs to be run in release mode.
-//!
-//! We create a `Vec` with `N_ROUNDS` of `OnceCell`s. All threads will walk the `Vec`, and race to
-//! be the first one to initialize a cell.
-//! Every thread adds the results of the cells it sees to an accumulator, which is compared at the
-//! end.
-//! All threads should end up with the same result.
-
-use once_cell::sync::OnceCell;
-
-const N_THREADS: usize = 32;
-const N_ROUNDS: usize = 1_000_000;
-
-static CELLS: OnceCell<Vec<OnceCell<usize>>> = OnceCell::new();
-static RESULT: OnceCell<usize> = OnceCell::new();
-
-fn main() {
- let start = std::time::Instant::now();
- CELLS.get_or_init(|| vec![OnceCell::new(); N_ROUNDS]);
- let threads =
- (0..N_THREADS).map(|i| std::thread::spawn(move || thread_main(i))).collect::<Vec<_>>();
- for thread in threads {
- thread.join().unwrap();
- }
- println!("{:?}", start.elapsed());
- println!("No races detected");
-}
-
-fn thread_main(i: usize) {
- let cells = CELLS.get().unwrap();
- let mut accum = 0;
- for cell in cells.iter() {
- let &value = cell.get_or_init(|| i);
- accum += value;
- }
- assert_eq!(RESULT.get_or_init(|| accum), &accum);
-}