spin_lock.hpp

#pragma once

#include <atomic>

namespace r3dVoxel::util
{
	/*
	 * An std::atomic_flag-based spin-lock.
	 * Meets the Lockable concept.
	 * Therefore, usable with std::lock_guard.
	 */
	class spin_lock
	{
		std::atomic_flag m_flag = ATOMIC_FLAG_INIT;

	public:
		void lock()     noexcept {   while(m_flag.test_and_set(std::memory_order_acquire)); }
		void unlock()   noexcept {         m_flag.clear(std::memory_order_release);         }
		bool try_lock() noexcept { return !m_flag.test_and_set(std::memory_order_acquire);  }
	};
}