spin_lock.hpp

#pragma once
 
#include <atomic>
 
namespace LibXR
{
 
class SpinLock
{
 private:
  std::atomic_flag atomic_flag_ = ATOMIC_FLAG_INIT;  
 
 public:
  bool TryLock() noexcept
  {
    return !atomic_flag_.test_and_set(std::memory_order_acquire);
  }
 
  void Lock() noexcept
  {
    while (atomic_flag_.test_and_set(std::memory_order_acquire))
    {
    }
  }
 
  void Unlock() noexcept { atomic_flag_.clear(std::memory_order_release); }
};
 
}  // namespace LibXR