Windows/Linux高精度计时器(C++)

  

   

    

     

    
    

     

      /* 
     
    
   

    

     

    
    

     

       * Linux/Windows 系统高精度计时器 
     
    
   

    

     

    
    

     

       */
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #ifndef __LX_TIMER_H__ 
     
    
   

    

     

    
    

     

      #define __LX_TIMER_H__ 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #ifdef WIN32 
     
    
   

    

     

    
    

     
 #include 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #elif linux 
     
    
   

    

     

    
    

     
 #include 
     
    
   

    

     

    
    

     
   
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #endif 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      class LxTimer 
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

      public:  
     
    
   

    

     

    
    

     

       LxTimer();  
     
    
   

    

     

    
    

     
 void start();  
     
    
   

    

     

    
    

     
 double stop();   // 返回从 start 到 stop 所经历的时间（单位:秒） 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      private:  
     
    
   

    

     

    
    

     

      #ifdef WIN32 
     
    
   

    

     

    
    

     
 double dSystemFreq;   
     
    
   

    

     

    
    

     

       BOOL   flag;  
     
    
   

    

     

    
    

     
 double dStartTime;  
     
    
   

    

     

    
    

     
 double dStopTime;  
     
    
   

    

     

    
    

     

      #elif linux 
     
    
   

    

     

    
    

     
 struct timeval tvStart;  
     
    
   

    

     

    
    

     
 struct timeval tvStop;  
     
    
   

    

     

    
    

     

      #endif 
     
    
   

    

     

    
    

     

      };  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #endif
     
    
   

    

     

    
    

     
   
     
    
  
 

  

   

    

     

    
    

     

      #include "LxTimer.h" 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #ifdef WIN32 
     
    
   

    

     

    
    

     
 #include 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #elif linux 
     
    
   

    

     

    
    

     
 #include 
     
    
   

    

     

    
    

     
   
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      #endif 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #ifdef WIN32 
     
    
   

    

     

    
    

     

      LxTimer::LxTimer()  
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

       LARGE_INTEGER sysFreq;  // 计时器频率 
     
    
   

    

     

    
    

     

       flag = QueryPerformanceFrequency( &sysFreq );  
     
    
   

    

     

    
    

     
 if ( flag )  
     
    
   

    

     

    
    

     

       {  
     
    
   

    

     

    
    

     

       dSystemFreq = (double)sysFreq.QuadPart;  
     
    
   

    

     

    
    

     

       }  
     
    
   

    

     

    
    

     

      }  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      void LxTimer::start() 
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

       LARGE_INTEGER t;  
     
    
   

    

     

    
    

     

       flag &= QueryPerformanceCounter( &t );  
     
    
   

    

     

    
    

     
 if ( !flag )  
     
    
   

    

     

    
    

     
 return;  
     
    
   

    

     

    
    

     

       dStartTime = (double)t.QuadPart;  
     
    
   

    

     

    
    

     

      }  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      double LxTimer::stop() 
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

       LARGE_INTEGER t;  
     
    
   

    

     

    
    

     

       flag &= QueryPerformanceCounter( &t );  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     
 if ( !flag )  
     
    
   

    

     

    
    

     
 return -1.0;  
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

       dStopTime = (double)t.QuadPart;  
     
    
   

    

     

    
    

     
 return ( dStopTime - dStartTime ) / dSystemFreq;  
     
    
   

    

     

    
    

     

      }  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #elif linux 
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      LxTimer::LxTimer(){}  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      void LxTimer::start() 
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

       gettimeofday( &tvStart, NULL );  
     
    
   

    

     

    
    

     

      }  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      double LxTimer::stop() 
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

       gettimeofday( &tvStop, NULL );  
     
    
   

    

     

    
    

     
 return (double)(tvStop.tv_sec - tvStart.tv_sec)  
     
    
   

    

     

    
    

     

       + (double)(tvStop.tv_usec - tvStart.tv_usec)/1000000.0;  
     
    
   

    

     

    
    

     

      }  
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     

      #endif
     
    
   

    

     

    
    

     
   
     
    
  
 

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原文链接：blog.csdn.net/jacke121/article/details/54667600