Long waiting time for other async thread?

[wangzhijiang-nreal]

Just be curious, what if an action is (computationally) heavy, does other thread wait for a long time for the lock to be released?

// UnityMainThreadDispatcher.cs

public void Update() {
    lock(_executionQueue) {
        while (_executionQueue.Count > 0) {
            _executionQueue.Dequeue().Invoke();
        }
    }
}