spinlock.h

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/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  @file spinlock.h
 
  Vitaly Sverchinsky
 
**********************************************************************/
 
#pragma once
 
#include <atomic>
#include <thread>
 
class spinlock
{
   std::atomic_flag flag = ATOMIC_FLAG_INIT;
public:
   ~spinlock() { }
 
   void lock()
   {
      for(unsigned i = 0; flag.test_and_set(std::memory_order_acquire); ++i)
         if(i & 1) std::this_thread::yield();
   }
 
   void unlock()
   {
      flag.clear(std::memory_order_release);
   }
};