Add wrapper around the loom Mutex

Signed-off-by: Zahari Dichev <zaharidichev@gmail.com>

tokio/src/loom/mocked.rs

@@ -1,5 +1,32 @@
 pub(crate) use loom::*;
 
+pub(crate) mod sync {
+
+    pub(crate) use loom::sync::MutexGuard;
+
+    #[derive(Debug)]
+    pub(crate) struct Mutex<T>(loom::sync::Mutex<T>);
+
+    #[allow(dead_code)]
+    impl<T> Mutex<T> {
+        #[inline]
+        pub(crate) fn new(t: T) -> Mutex<T> {
+            Mutex(loom::sync::Mutex::new(t))
+        }
+
+        #[inline]
+        pub(crate) fn lock(&self) -> MutexGuard<'_, T> {
+            self.0.lock().unwrap()
+        }
+
+        #[inline]
+        pub(crate) fn try_lock(&self) -> Option<MutexGuard<'_, T>> {
+            self.0.try_lock().ok()
+        }
+    }
+    pub(crate) use loom::sync::*;
+}
+
 pub(crate) mod rand {
     pub(crate) fn seed() -> u64 {
         1