message: Reduce the number of iterations
diff: @@ -212,7 +212,7 @@ const FREE: i32 = 0;
  const HELD: i32 = 1;
  fn concurrent_wait_wake() {
  static FUTEX: AtomicI32 = AtomicI32::new(0);
  - for _ in 0..100 {
  + for _ in 0..20 {
  // Suppose the main thread is holding a lock implemented using futex...
  FUTEX.store(HELD, Ordering::Relaxed);
  