1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/rust/tokio-threadpool/src/task/state.rs b/third_party/rust/tokio-threadpool/src/task/state.rs
new file mode 100644
index 0000000000..3e00f89bc5
--- /dev/null
+++ b/third_party/rust/tokio-threadpool/src/task/state.rs
@@ -0,0 +1,57 @@
+#[repr(usize)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq)]
+pub(crate) enum State {
+    /// Task is currently idle
+    Idle = 0,
+
+    /// Task is currently running
+    Running = 1,
+
+    /// Task is currently running, but has been notified that it must run again.
+    Notified = 2,
+
+    /// Task has been scheduled
+    Scheduled = 3,
+
+    /// Task is complete
+    Complete = 4,
+
+    /// Task was aborted because the thread pool has been shut down
+    Aborted = 5,
+}
+
+// ===== impl State =====
+
+impl State {
+    /// Returns the initial task state.
+    ///
+    /// Tasks start in the scheduled state as they are immediately scheduled on
+    /// creation.
+    pub fn new() -> State {
+        State::Scheduled
+    }
+
+    pub fn stub() -> State {
+        State::Idle
+    }
+}
+
+impl From<usize> for State {
+    fn from(src: usize) -> Self {
+        use self::State::*;
+
+        debug_assert!(
+            src >= Idle as usize && src <= Aborted as usize,
+            "actual={}",
+            src
+        );
+
+        unsafe { ::std::mem::transmute(src) }
+    }
+}
+
+impl From<State> for usize {
+    fn from(src: State) -> Self {
+        src as usize
+    }
+}