basic spin lock

spin_lock.cpp

class Atomic {
	std::atomic<int> val = 0;
public:
	void Lock()
	{
		int expected = 0;
		while (!val.compare_exchange_weak(expected, 1)) {
			expected = 0;
		}
	}

	void Unlock()
	{
		val.exchange(0);
	}
};