7077 updated to use strong and weak count methods that already existe…

…d, updated comments to match coding standards

tokio/src/sync/mpsc/chan.rs

@@ -208,10 +208,6 @@ impl<T, S: Semaphore> Tx<T, S> {
         }
         notified.await;
     }
-
-    pub(crate) fn len(&self) -> usize {
-        self.inner.tx_count.load(Ordering::SeqCst)
-    }
 }
 
 impl<T, S> Clone for Tx<T, S> {

tokio/src/sync/mpsc/unbounded.rs

@@ -676,9 +676,10 @@ impl<T> UnboundedSender<T> {
         self.chan.weak_count()
     }
 
-    //Returns length of [`UnboundedSender`] semaphores /2, supposidly the number of messages.
+    ///Returns length of [`UnboundedSender`] semaphores /2, the number of messages.
     pub fn len(&self) -> usize{
-        self.chan.len()
+        (self.strong_count() + self.weak_count()) / 2
+
     }
 }