mpsc: early return for empty PermitIterator for drop logic

tokio-rs · Jan 2, 2024 · ec8b537 · ec8b537
1 parent 830188e
commit ec8b537
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs
@@ -1545,6 +1545,10 @@ impl<T> Drop for PermitIterator<'_, T> {
     fn drop(&mut self) {
         use chan::Semaphore;
 
+        if self.n == 0 {
+            return;
+        }
+
         let semaphore = self.chan.semaphore();
 
         // Add the remaining permits back to the semaphore