message: make a sync test more reliable
diff: @@ -77,13 +77,12 @@ fn check_conditional_variables_timed_wait_notimeout() {
  let guard = lock.lock().unwrap();
  let handle = thread::spawn(move || {
  + thread::sleep(Duration::from_millis(100)); // Make sure the other thread is waiting by the time we call `notify`.
  let (_lock, cvar) = &*pair2;
  cvar.notify_one();
  });
  - // macOS runners are very unreliable.
  - let timeout = if cfg!(target_os = "macos") { 2000 } else { 500 };
  - let (_guard, timeout) = cvar.wait_timeout(guard, Duration::from_millis(timeout)).unwrap();
  + let (_guard, timeout) = cvar.wait_timeout(guard, Duration::from_millis(500)).unwrap();
  assert!(!timeout.timed_out());
  handle.join().unwrap();
  }
  