1 template<class Lock>
2 class Lock_guard{
3 private:
4 Lock lock;
5 public:
6 explicit Lock_guard(Lock& lock){
7 this->lock = lock;
8 this->lock.lock();
9 }
10 ~Lock_guard(){
11 this->lock.unlock();
12 }
13 Lock_guard(const Lock_guard&) = delete;
14 Lock_guard& operator = (const Lock_guard&) = delete;
15 };
16
17 class TTASLock{
18 private:
19 atomic<bool> state;
20 public:
21 void lock(){
22 while (true){
23 while (state.load()){};
24 if (!state.exchange(true, std::memory_order_relaxed))
25 return;
26 }
27 }
28 void unlock(){
29 state.store(false);
30 }
31 };
