360 lines
8.6 KiB
Rust
360 lines
8.6 KiB
Rust
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use std::sync::atomic::Ordering::SeqCst;
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use std::sync::atomic::{AtomicBool, AtomicUsize};
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use std::sync::{Arc, Mutex};
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use crossbeam_deque::Steal::{Empty, Success};
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use crossbeam_deque::Worker;
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use crossbeam_utils::thread::scope;
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use rand::Rng;
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#[test]
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fn smoke() {
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let w = Worker::new_lifo();
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let s = w.stealer();
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assert_eq!(w.pop(), None);
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assert_eq!(s.steal(), Empty);
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w.push(1);
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assert_eq!(w.pop(), Some(1));
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assert_eq!(w.pop(), None);
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assert_eq!(s.steal(), Empty);
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w.push(2);
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assert_eq!(s.steal(), Success(2));
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assert_eq!(s.steal(), Empty);
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assert_eq!(w.pop(), None);
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w.push(3);
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w.push(4);
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w.push(5);
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assert_eq!(s.steal(), Success(3));
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assert_eq!(s.steal(), Success(4));
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assert_eq!(s.steal(), Success(5));
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assert_eq!(s.steal(), Empty);
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w.push(6);
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w.push(7);
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w.push(8);
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w.push(9);
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assert_eq!(w.pop(), Some(9));
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assert_eq!(s.steal(), Success(6));
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assert_eq!(w.pop(), Some(8));
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assert_eq!(w.pop(), Some(7));
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assert_eq!(w.pop(), None);
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}
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#[test]
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fn is_empty() {
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let w = Worker::new_lifo();
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let s = w.stealer();
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assert!(w.is_empty());
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w.push(1);
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assert!(!w.is_empty());
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w.push(2);
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assert!(!w.is_empty());
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let _ = w.pop();
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assert!(!w.is_empty());
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let _ = w.pop();
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assert!(w.is_empty());
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assert!(s.is_empty());
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w.push(1);
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assert!(!s.is_empty());
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w.push(2);
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assert!(!s.is_empty());
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let _ = s.steal();
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assert!(!s.is_empty());
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let _ = s.steal();
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assert!(s.is_empty());
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}
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#[test]
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fn spsc() {
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#[cfg(miri)]
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const STEPS: usize = 500;
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#[cfg(not(miri))]
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const STEPS: usize = 50_000;
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let w = Worker::new_lifo();
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let s = w.stealer();
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scope(|scope| {
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scope.spawn(|_| {
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for i in 0..STEPS {
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loop {
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if let Success(v) = s.steal() {
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assert_eq!(i, v);
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break;
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}
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#[cfg(miri)]
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std::hint::spin_loop();
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}
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}
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assert_eq!(s.steal(), Empty);
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});
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for i in 0..STEPS {
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w.push(i);
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}
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})
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.unwrap();
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}
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#[test]
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fn stampede() {
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const THREADS: usize = 8;
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#[cfg(miri)]
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const COUNT: usize = 500;
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#[cfg(not(miri))]
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const COUNT: usize = 50_000;
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let w = Worker::new_lifo();
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for i in 0..COUNT {
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w.push(Box::new(i + 1));
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}
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let remaining = Arc::new(AtomicUsize::new(COUNT));
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scope(|scope| {
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for _ in 0..THREADS {
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let s = w.stealer();
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let remaining = remaining.clone();
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scope.spawn(move |_| {
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let mut last = 0;
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while remaining.load(SeqCst) > 0 {
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if let Success(x) = s.steal() {
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assert!(last < *x);
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last = *x;
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remaining.fetch_sub(1, SeqCst);
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}
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}
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});
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}
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let mut last = COUNT + 1;
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while remaining.load(SeqCst) > 0 {
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if let Some(x) = w.pop() {
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assert!(last > *x);
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last = *x;
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remaining.fetch_sub(1, SeqCst);
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}
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}
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})
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.unwrap();
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}
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#[test]
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fn stress() {
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const THREADS: usize = 8;
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#[cfg(miri)]
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const COUNT: usize = 500;
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#[cfg(not(miri))]
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const COUNT: usize = 50_000;
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let w = Worker::new_lifo();
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let done = Arc::new(AtomicBool::new(false));
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let hits = Arc::new(AtomicUsize::new(0));
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scope(|scope| {
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for _ in 0..THREADS {
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let s = w.stealer();
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let done = done.clone();
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let hits = hits.clone();
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scope.spawn(move |_| {
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let w2 = Worker::new_lifo();
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while !done.load(SeqCst) {
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if let Success(_) = s.steal() {
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hits.fetch_add(1, SeqCst);
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}
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let _ = s.steal_batch(&w2);
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if let Success(_) = s.steal_batch_and_pop(&w2) {
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hits.fetch_add(1, SeqCst);
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}
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while w2.pop().is_some() {
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hits.fetch_add(1, SeqCst);
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}
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}
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});
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}
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let mut rng = rand::thread_rng();
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let mut expected = 0;
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while expected < COUNT {
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if rng.gen_range(0..3) == 0 {
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while w.pop().is_some() {
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hits.fetch_add(1, SeqCst);
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}
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} else {
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w.push(expected);
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expected += 1;
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}
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}
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while hits.load(SeqCst) < COUNT {
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while w.pop().is_some() {
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hits.fetch_add(1, SeqCst);
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}
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}
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done.store(true, SeqCst);
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})
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.unwrap();
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}
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#[cfg_attr(miri, ignore)] // Miri is too slow
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#[test]
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fn no_starvation() {
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const THREADS: usize = 8;
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const COUNT: usize = 50_000;
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let w = Worker::new_lifo();
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let done = Arc::new(AtomicBool::new(false));
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let mut all_hits = Vec::new();
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scope(|scope| {
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for _ in 0..THREADS {
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let s = w.stealer();
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let done = done.clone();
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let hits = Arc::new(AtomicUsize::new(0));
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all_hits.push(hits.clone());
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scope.spawn(move |_| {
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let w2 = Worker::new_lifo();
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while !done.load(SeqCst) {
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if let Success(_) = s.steal() {
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hits.fetch_add(1, SeqCst);
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}
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let _ = s.steal_batch(&w2);
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if let Success(_) = s.steal_batch_and_pop(&w2) {
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hits.fetch_add(1, SeqCst);
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}
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while w2.pop().is_some() {
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hits.fetch_add(1, SeqCst);
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}
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}
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});
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}
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let mut rng = rand::thread_rng();
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let mut my_hits = 0;
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loop {
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for i in 0..rng.gen_range(0..COUNT) {
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if rng.gen_range(0..3) == 0 && my_hits == 0 {
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while w.pop().is_some() {
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my_hits += 1;
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}
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} else {
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w.push(i);
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}
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}
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if my_hits > 0 && all_hits.iter().all(|h| h.load(SeqCst) > 0) {
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break;
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}
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}
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done.store(true, SeqCst);
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})
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.unwrap();
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}
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#[test]
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fn destructors() {
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#[cfg(miri)]
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const THREADS: usize = 2;
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#[cfg(not(miri))]
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const THREADS: usize = 8;
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#[cfg(miri)]
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const COUNT: usize = 500;
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#[cfg(not(miri))]
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const COUNT: usize = 50_000;
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#[cfg(miri)]
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const STEPS: usize = 100;
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#[cfg(not(miri))]
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const STEPS: usize = 1000;
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struct Elem(usize, Arc<Mutex<Vec<usize>>>);
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impl Drop for Elem {
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fn drop(&mut self) {
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self.1.lock().unwrap().push(self.0);
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}
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}
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let w = Worker::new_lifo();
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let dropped = Arc::new(Mutex::new(Vec::new()));
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let remaining = Arc::new(AtomicUsize::new(COUNT));
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for i in 0..COUNT {
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w.push(Elem(i, dropped.clone()));
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}
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scope(|scope| {
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for _ in 0..THREADS {
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let remaining = remaining.clone();
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let s = w.stealer();
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scope.spawn(move |_| {
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let w2 = Worker::new_lifo();
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let mut cnt = 0;
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while cnt < STEPS {
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if let Success(_) = s.steal() {
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cnt += 1;
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remaining.fetch_sub(1, SeqCst);
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}
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let _ = s.steal_batch(&w2);
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if let Success(_) = s.steal_batch_and_pop(&w2) {
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cnt += 1;
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remaining.fetch_sub(1, SeqCst);
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}
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while w2.pop().is_some() {
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cnt += 1;
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remaining.fetch_sub(1, SeqCst);
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}
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}
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});
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}
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for _ in 0..STEPS {
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if w.pop().is_some() {
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remaining.fetch_sub(1, SeqCst);
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}
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}
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})
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.unwrap();
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let rem = remaining.load(SeqCst);
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assert!(rem > 0);
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{
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let mut v = dropped.lock().unwrap();
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assert_eq!(v.len(), COUNT - rem);
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v.clear();
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}
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drop(w);
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{
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let mut v = dropped.lock().unwrap();
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assert_eq!(v.len(), rem);
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v.sort_unstable();
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for pair in v.windows(2) {
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assert_eq!(pair[0] + 1, pair[1]);
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}
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}
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}
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