static MySingleton* getInstance(){
 MySingleton* sin = instance.load();
   if (!sin){
     std::lock_guard<std::mutex> myLock(myMutex);
     sin = instance.load(std::memory_order_relaxed);
     if(!sin){
       sin = new MySingleton();
       instance.store(sin);
     }
   }
   volatile int dummy{};
   return sin;
 }