1 files changed, 48 insertions, 0 deletions
diff --git a/tokio/src/executor/loom/std/causal_cell.rs b/tokio/src/executor/loom/std/causal_cell.rs
new file mode 100644
index 00000000..8247788d
--- /dev/null
+++ b/tokio/src/executor/loom/std/causal_cell.rs
@@ -0,0 +1,48 @@
+use std::cell::UnsafeCell;
+
+pub(crate) struct CausalCell<T>(UnsafeCell<T>);
+
+#[derive(Default)]
+pub(crate) struct CausalCheck(());
+
+impl<T> CausalCell<T> {
+    pub(crate) fn new(data: T) -> CausalCell<T> {
+        CausalCell(UnsafeCell::new(data))
+    }
+
+    pub(crate) fn with<F, R>(&self, f: F) -> R
+    where
+        F: FnOnce(*const T) -> R,
+    {
+        f(self.0.get())
+    }
+
+    pub(crate) fn with_unchecked<F, R>(&self, f: F) -> R
+    where
+        F: FnOnce(*const T) -> R,
+    {
+        f(self.0.get())
+    }
+
+    pub(crate) fn check(&self) {}
+
+    pub(crate) fn with_deferred<F, R>(&self, f: F) -> (R, CausalCheck)
+    where
+        F: FnOnce(*const T) -> R,
+    {
+        (f(self.0.get()), CausalCheck::default())
+    }
+
+    pub(crate) fn with_mut<F, R>(&self, f: F) -> R
+    where
+        F: FnOnce(*mut T) -> R,
+    {
+        f(self.0.get())
+    }
+}
+
+impl CausalCheck {
+    pub(crate) fn check(self) {}
+
+    pub(crate) fn join(&mut self, _other: CausalCheck) {}
+}