TeaSpeakLibrary/src/misc/spin_lock.h

#pragma once

#include <atomic>
#include <thread>

class spin_lock {
		std::atomic_flag locked = ATOMIC_FLAG_INIT;
	public:
		inline void lock() {
			uint8_t round = 0;
			while (locked.test_and_set(std::memory_order_acquire)) {
#if false
                /* waiting 'till its zero so we can try an exchanged again; Atomic exchanges have a huge bug overhead to deal with! */
#ifdef WIN32
                while(locked._My_flag > 0) {
#else
                while(locked._M_i) {
#endif
#endif
					//Yield when we're using this lock for a longer time, which we usually not doing
					if(round++ % 8 == 0)
						std::this_thread::yield();
#if false
				}
#endif
            }
		}

		inline bool try_lock() {
			return !locked.test_and_set(std::memory_order_acquire);
		}

		inline void unlock() {
			locked.clear(std::memory_order_release);
		}
};