1 files changed, 374 insertions, 0 deletions
diff --git a/third_party/rust/crossbeam-queue/tests/array_queue.rs b/third_party/rust/crossbeam-queue/tests/array_queue.rs
new file mode 100644
index 0000000000..b9d4e5fd46
--- /dev/null
+++ b/third_party/rust/crossbeam-queue/tests/array_queue.rs
@@ -0,0 +1,374 @@
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use crossbeam_queue::ArrayQueue;
+use crossbeam_utils::thread::scope;
+use rand::{thread_rng, Rng};
+
+#[test]
+fn smoke() {
+    let q = ArrayQueue::new(1);
+
+    q.push(7).unwrap();
+    assert_eq!(q.pop(), Some(7));
+
+    q.push(8).unwrap();
+    assert_eq!(q.pop(), Some(8));
+    assert!(q.pop().is_none());
+}
+
+#[test]
+fn capacity() {
+    for i in 1..10 {
+        let q = ArrayQueue::<i32>::new(i);
+        assert_eq!(q.capacity(), i);
+    }
+}
+
+#[test]
+#[should_panic(expected = "capacity must be non-zero")]
+fn zero_capacity() {
+    let _ = ArrayQueue::<i32>::new(0);
+}
+
+#[test]
+fn len_empty_full() {
+    let q = ArrayQueue::new(2);
+
+    assert_eq!(q.len(), 0);
+    assert!(q.is_empty());
+    assert!(!q.is_full());
+
+    q.push(()).unwrap();
+
+    assert_eq!(q.len(), 1);
+    assert!(!q.is_empty());
+    assert!(!q.is_full());
+
+    q.push(()).unwrap();
+
+    assert_eq!(q.len(), 2);
+    assert!(!q.is_empty());
+    assert!(q.is_full());
+
+    q.pop().unwrap();
+
+    assert_eq!(q.len(), 1);
+    assert!(!q.is_empty());
+    assert!(!q.is_full());
+}
+
+#[test]
+fn len() {
+    #[cfg(miri)]
+    const COUNT: usize = 30;
+    #[cfg(not(miri))]
+    const COUNT: usize = 25_000;
+    #[cfg(miri)]
+    const CAP: usize = 40;
+    #[cfg(not(miri))]
+    const CAP: usize = 1000;
+    const ITERS: usize = CAP / 20;
+
+    let q = ArrayQueue::new(CAP);
+    assert_eq!(q.len(), 0);
+
+    for _ in 0..CAP / 10 {
+        for i in 0..ITERS {
+            q.push(i).unwrap();
+            assert_eq!(q.len(), i + 1);
+        }
+
+        for i in 0..ITERS {
+            q.pop().unwrap();
+            assert_eq!(q.len(), ITERS - i - 1);
+        }
+    }
+    assert_eq!(q.len(), 0);
+
+    for i in 0..CAP {
+        q.push(i).unwrap();
+        assert_eq!(q.len(), i + 1);
+    }
+
+    for _ in 0..CAP {
+        q.pop().unwrap();
+    }
+    assert_eq!(q.len(), 0);
+
+    scope(|scope| {
+        scope.spawn(|_| {
+            for i in 0..COUNT {
+                loop {
+                    if let Some(x) = q.pop() {
+                        assert_eq!(x, i);
+                        break;
+                    }
+                }
+                let len = q.len();
+                assert!(len <= CAP);
+            }
+        });
+
+        scope.spawn(|_| {
+            for i in 0..COUNT {
+                while q.push(i).is_err() {}
+                let len = q.len();
+                assert!(len <= CAP);
+            }
+        });
+    })
+    .unwrap();
+    assert_eq!(q.len(), 0);
+}
+
+#[test]
+fn spsc() {
+    #[cfg(miri)]
+    const COUNT: usize = 50;
+    #[cfg(not(miri))]
+    const COUNT: usize = 100_000;
+
+    let q = ArrayQueue::new(3);
+
+    scope(|scope| {
+        scope.spawn(|_| {
+            for i in 0..COUNT {
+                loop {
+                    if let Some(x) = q.pop() {
+                        assert_eq!(x, i);
+                        break;
+                    }
+                }
+            }
+            assert!(q.pop().is_none());
+        });
+
+        scope.spawn(|_| {
+            for i in 0..COUNT {
+                while q.push(i).is_err() {}
+            }
+        });
+    })
+    .unwrap();
+}
+
+#[test]
+fn spsc_ring_buffer() {
+    #[cfg(miri)]
+    const COUNT: usize = 50;
+    #[cfg(not(miri))]
+    const COUNT: usize = 100_000;
+
+    let t = AtomicUsize::new(1);
+    let q = ArrayQueue::<usize>::new(3);
+    let v = (0..COUNT).map(|_| AtomicUsize::new(0)).collect::<Vec<_>>();
+
+    scope(|scope| {
+        scope.spawn(|_| loop {
+            match t.load(Ordering::SeqCst) {
+                0 if q.is_empty() => break,
+
+                _ => {
+                    while let Some(n) = q.pop() {
+                        v[n].fetch_add(1, Ordering::SeqCst);
+                    }
+                }
+            }
+        });
+
+        scope.spawn(|_| {
+            for i in 0..COUNT {
+                if let Some(n) = q.force_push(i) {
+                    v[n].fetch_add(1, Ordering::SeqCst);
+                }
+            }
+
+            t.fetch_sub(1, Ordering::SeqCst);
+        });
+    })
+    .unwrap();
+
+    for c in v {
+        assert_eq!(c.load(Ordering::SeqCst), 1);
+    }
+}
+
+#[test]
+fn mpmc() {
+    #[cfg(miri)]
+    const COUNT: usize = 50;
+    #[cfg(not(miri))]
+    const COUNT: usize = 25_000;
+    const THREADS: usize = 4;
+
+    let q = ArrayQueue::<usize>::new(3);
+    let v = (0..COUNT).map(|_| AtomicUsize::new(0)).collect::<Vec<_>>();
+
+    scope(|scope| {
+        for _ in 0..THREADS {
+            scope.spawn(|_| {
+                for _ in 0..COUNT {
+                    let n = loop {
+                        if let Some(x) = q.pop() {
+                            break x;
+                        }
+                    };
+                    v[n].fetch_add(1, Ordering::SeqCst);
+                }
+            });
+        }
+        for _ in 0..THREADS {
+            scope.spawn(|_| {
+                for i in 0..COUNT {
+                    while q.push(i).is_err() {}
+                }
+            });
+        }
+    })
+    .unwrap();
+
+    for c in v {
+        assert_eq!(c.load(Ordering::SeqCst), THREADS);
+    }
+}
+
+#[test]
+fn mpmc_ring_buffer() {
+    #[cfg(miri)]
+    const COUNT: usize = 50;
+    #[cfg(not(miri))]
+    const COUNT: usize = 25_000;
+    const THREADS: usize = 4;
+
+    let t = AtomicUsize::new(THREADS);
+    let q = ArrayQueue::<usize>::new(3);
+    let v = (0..COUNT).map(|_| AtomicUsize::new(0)).collect::<Vec<_>>();
+
+    scope(|scope| {
+        for _ in 0..THREADS {
+            scope.spawn(|_| loop {
+                match t.load(Ordering::SeqCst) {
+                    0 if q.is_empty() => break,
+
+                    _ => {
+                        while let Some(n) = q.pop() {
+                            v[n].fetch_add(1, Ordering::SeqCst);
+                        }
+                    }
+                }
+            });
+        }
+
+        for _ in 0..THREADS {
+            scope.spawn(|_| {
+                for i in 0..COUNT {
+                    if let Some(n) = q.force_push(i) {
+                        v[n].fetch_add(1, Ordering::SeqCst);
+                    }
+                }
+
+                t.fetch_sub(1, Ordering::SeqCst);
+            });
+        }
+    })
+    .unwrap();
+
+    for c in v {
+        assert_eq!(c.load(Ordering::SeqCst), THREADS);
+    }
+}
+
+#[test]
+fn drops() {
+    let runs: usize = if cfg!(miri) { 3 } else { 100 };
+    let steps: usize = if cfg!(miri) { 50 } else { 10_000 };
+    let additional: usize = if cfg!(miri) { 10 } else { 50 };
+
+    static DROPS: AtomicUsize = AtomicUsize::new(0);
+
+    #[derive(Debug, PartialEq)]
+    struct DropCounter;
+
+    impl Drop for DropCounter {
+        fn drop(&mut self) {
+            DROPS.fetch_add(1, Ordering::SeqCst);
+        }
+    }
+
+    let mut rng = thread_rng();
+
+    for _ in 0..runs {
+        let steps = rng.gen_range(0..steps);
+        let additional = rng.gen_range(0..additional);
+
+        DROPS.store(0, Ordering::SeqCst);
+        let q = ArrayQueue::new(50);
+
+        scope(|scope| {
+            scope.spawn(|_| {
+                for _ in 0..steps {
+                    while q.pop().is_none() {}
+                }
+            });
+
+            scope.spawn(|_| {
+                for _ in 0..steps {
+                    while q.push(DropCounter).is_err() {
+                        DROPS.fetch_sub(1, Ordering::SeqCst);
+                    }
+                }
+            });
+        })
+        .unwrap();
+
+        for _ in 0..additional {
+            q.push(DropCounter).unwrap();
+        }
+
+        assert_eq!(DROPS.load(Ordering::SeqCst), steps);
+        drop(q);
+        assert_eq!(DROPS.load(Ordering::SeqCst), steps + additional);
+    }
+}
+
+#[test]
+fn linearizable() {
+    #[cfg(miri)]
+    const COUNT: usize = 100;
+    #[cfg(not(miri))]
+    const COUNT: usize = 25_000;
+    const THREADS: usize = 4;
+
+    let q = ArrayQueue::new(THREADS);
+
+    scope(|scope| {
+        for _ in 0..THREADS / 2 {
+            scope.spawn(|_| {
+                for _ in 0..COUNT {
+                    while q.push(0).is_err() {}
+                    q.pop().unwrap();
+                }
+            });
+
+            scope.spawn(|_| {
+                for _ in 0..COUNT {
+                    if q.force_push(0).is_none() {
+                        q.pop().unwrap();
+                    }
+                }
+            });
+        }
+    })
+    .unwrap();
+}
+
+#[test]
+fn into_iter() {
+    let q = ArrayQueue::new(100);
+    for i in 0..100 {
+        q.push(i).unwrap();
+    }
+    for (i, j) in q.into_iter().enumerate() {
+        assert_eq!(i, j);
+    }
+}