multithreading on arrays

class MyArrayWrapper  // untested code
{
   private:
      std::vector<int> MyArray;
      CCriticalSection MyCC;    // Sync Object

   public:
      int WriteToEnd(int Num)
      {
         CSingleLock cs(&MyCC); // Wait till MyCC is free
         MyArray.push_back(Num);
         return MyArray.size();
         // cs goes out of scope and releases MyCC so another thread can run
      }

      int ReadAndRemoveFromBack()
      {
         CSingleLock cs(&MyCC);
         int ret = MyArray.back();
         MyArray.pop_back();
         return ret;
      }
}