1 files changed, 202 insertions, 0 deletions
diff --git a/vendor/tokio/src/runtime/tests/queue.rs b/vendor/tokio/src/runtime/tests/queue.rs
new file mode 100644
index 000000000..b2962f154
--- /dev/null
+++ b/vendor/tokio/src/runtime/tests/queue.rs
@@ -0,0 +1,202 @@
+use crate::runtime::queue;
+use crate::runtime::task::{self, Schedule, Task};
+
+use std::thread;
+use std::time::Duration;
+
+#[test]
+fn fits_256() {
+    let (_, mut local) = queue::local();
+    let inject = queue::Inject::new();
+
+    for _ in 0..256 {
+        let (task, _) = super::joinable::<_, Runtime>(async {});
+        local.push_back(task, &inject);
+    }
+
+    assert!(inject.pop().is_none());
+
+    while local.pop().is_some() {}
+}
+
+#[test]
+fn overflow() {
+    let (_, mut local) = queue::local();
+    let inject = queue::Inject::new();
+
+    for _ in 0..257 {
+        let (task, _) = super::joinable::<_, Runtime>(async {});
+        local.push_back(task, &inject);
+    }
+
+    let mut n = 0;
+
+    while inject.pop().is_some() {
+        n += 1;
+    }
+
+    while local.pop().is_some() {
+        n += 1;
+    }
+
+    assert_eq!(n, 257);
+}
+
+#[test]
+fn steal_batch() {
+    let (steal1, mut local1) = queue::local();
+    let (_, mut local2) = queue::local();
+    let inject = queue::Inject::new();
+
+    for _ in 0..4 {
+        let (task, _) = super::joinable::<_, Runtime>(async {});
+        local1.push_back(task, &inject);
+    }
+
+    assert!(steal1.steal_into(&mut local2).is_some());
+
+    for _ in 0..1 {
+        assert!(local2.pop().is_some());
+    }
+
+    assert!(local2.pop().is_none());
+
+    for _ in 0..2 {
+        assert!(local1.pop().is_some());
+    }
+
+    assert!(local1.pop().is_none());
+}
+
+#[test]
+fn stress1() {
+    const NUM_ITER: usize = 1;
+    const NUM_STEAL: usize = 1_000;
+    const NUM_LOCAL: usize = 1_000;
+    const NUM_PUSH: usize = 500;
+    const NUM_POP: usize = 250;
+
+    for _ in 0..NUM_ITER {
+        let (steal, mut local) = queue::local();
+        let inject = queue::Inject::new();
+
+        let th = thread::spawn(move || {
+            let (_, mut local) = queue::local();
+            let mut n = 0;
+
+            for _ in 0..NUM_STEAL {
+                if steal.steal_into(&mut local).is_some() {
+                    n += 1;
+                }
+
+                while local.pop().is_some() {
+                    n += 1;
+                }
+
+                thread::yield_now();
+            }
+
+            n
+        });
+
+        let mut n = 0;
+
+        for _ in 0..NUM_LOCAL {
+            for _ in 0..NUM_PUSH {
+                let (task, _) = super::joinable::<_, Runtime>(async {});
+                local.push_back(task, &inject);
+            }
+
+            for _ in 0..NUM_POP {
+                if local.pop().is_some() {
+                    n += 1;
+                } else {
+                    break;
+                }
+            }
+        }
+
+        while inject.pop().is_some() {
+            n += 1;
+        }
+
+        n += th.join().unwrap();
+
+        assert_eq!(n, NUM_LOCAL * NUM_PUSH);
+    }
+}
+
+#[test]
+fn stress2() {
+    const NUM_ITER: usize = 1;
+    const NUM_TASKS: usize = 1_000_000;
+    const NUM_STEAL: usize = 1_000;
+
+    for _ in 0..NUM_ITER {
+        let (steal, mut local) = queue::local();
+        let inject = queue::Inject::new();
+
+        let th = thread::spawn(move || {
+            let (_, mut local) = queue::local();
+            let mut n = 0;
+
+            for _ in 0..NUM_STEAL {
+                if steal.steal_into(&mut local).is_some() {
+                    n += 1;
+                }
+
+                while local.pop().is_some() {
+                    n += 1;
+                }
+
+                thread::sleep(Duration::from_micros(10));
+            }
+
+            n
+        });
+
+        let mut num_pop = 0;
+
+        for i in 0..NUM_TASKS {
+            let (task, _) = super::joinable::<_, Runtime>(async {});
+            local.push_back(task, &inject);
+
+            if i % 128 == 0 && local.pop().is_some() {
+                num_pop += 1;
+            }
+
+            while inject.pop().is_some() {
+                num_pop += 1;
+            }
+        }
+
+        num_pop += th.join().unwrap();
+
+        while local.pop().is_some() {
+            num_pop += 1;
+        }
+
+        while inject.pop().is_some() {
+            num_pop += 1;
+        }
+
+        assert_eq!(num_pop, NUM_TASKS);
+    }
+}
+
+struct Runtime;
+
+impl Schedule for Runtime {
+    fn bind(task: Task<Self>) -> Runtime {
+        std::mem::forget(task);
+        Runtime
+    }
+
+    fn release(&self, _task: &Task<Self>) -> Option<Task<Self>> {
+        None
+    }
+
+    fn schedule(&self, _task: task::Notified<Self>) {
+        unreachable!();
+    }
+}