TTAS Lock C++11 实现

 template<class Lock>
 class Lock_guard{
 private:
     Lock lock;
 public:
     explicit Lock_guard(Lock& lock){
         this->lock = lock;
         this->lock.lock();
     }
     ~Lock_guard(){
         this->lock.unlock();
     }
     Lock_guard(const Lock_guard&) = delete;
     Lock_guard& operator = (const Lock_guard&) = delete;
 };

 class TTASLock{
 private:
     atomic<bool> state;
 public:
     void lock(){
         while (true){
             while (state.load()){};
             if (!state.exchange(true, std::memory_order_relaxed))
                 return;
         }
     }
     void unlock(){
         state.store(false);
     }
 };