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);
    }
};