1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/tokio/src/loom/std/mutex.rs b/third_party/rust/tokio/src/loom/std/mutex.rs
new file mode 100644
index 0000000000..3f686e0a78
--- /dev/null
+++ b/third_party/rust/tokio/src/loom/std/mutex.rs
@@ -0,0 +1,31 @@
+use std::sync::{self, MutexGuard, TryLockError};
+
+/// Adapter for `std::Mutex` that removes the poisoning aspects
+/// from its api.
+#[derive(Debug)]
+pub(crate) struct Mutex<T: ?Sized>(sync::Mutex<T>);
+
+#[allow(dead_code)]
+impl<T> Mutex<T> {
+    #[inline]
+    pub(crate) fn new(t: T) -> Mutex<T> {
+        Mutex(sync::Mutex::new(t))
+    }
+
+    #[inline]
+    pub(crate) fn lock(&self) -> MutexGuard<'_, T> {
+        match self.0.lock() {
+            Ok(guard) => guard,
+            Err(p_err) => p_err.into_inner(),
+        }
+    }
+
+    #[inline]
+    pub(crate) fn try_lock(&self) -> Option<MutexGuard<'_, T>> {
+        match self.0.try_lock() {
+            Ok(guard) => Some(guard),
+            Err(TryLockError::Poisoned(p_err)) => Some(p_err.into_inner()),
+            Err(TryLockError::WouldBlock) => None,
+        }
+    }
+}