src/Duration.h

   1 // Duration.h: interface for the Duration class.
   2 //
   3 //////////////////////////////////////////////////////////////////////
   4
   5 #if !defined(AFX_DURATION_H__95A8A4BA_3CFB_4ABC_8C48_495328EA1336__INCLUDED_)
   6 #define AFX_DURATION_H__95A8A4BA_3CFB_4ABC_8C48_495328EA1336__INCLUDED_
   7
   8 #if _MSC_VER > 1000
   9 #pragma once
  10 #endif // _MSC_VER > 1000
  11
  12 #ifdef WIN32
  13         #pragma once
  14         #include <windows.h>
  15 #else
  16         #include <sys/time.h>
  17         #define TIMEVAL struct timeval
  18         #define TIMEVAL struct timeval
  19
  20         #ifndef NULL
  21                 #define NULL 0
  22         #endif
  23
  24         #define GET_TIME(T) gettimeofday(&T,NULL)
  25         #define ELAPSED_TIME_SEC(B, A) \
  26                 static_cast<double>((A.tv_sec - B.tv_sec) + (1.E-6 * (A.tv_usec - B.tv_usec))) // B = start; A = end #endif
  27 #endif
  28
  29 class Duration
  30 {
  31 public:
  32         Duration();
  33         virtual ~Duration() {};
  34
  35         void Start(void);
  36         void Stop(void);
  37         double GetDuration(void) const;
  38         double GetDurationInMs(void) const;
  39
  40 protected:
  41
  42 #ifdef WIN32
  43         LARGE_INTEGER m_liStart;
  44         LARGE_INTEGER m_liStop;
  45
  46         LONGLONG m_llFrequency;
  47         LONGLONG m_llCorrection;
  48 #else
  49         TIMEVAL         m_liStart;
  50         TIMEVAL         m_liStop;
  51 //      LONGLONG        m_llCorrection;
  52 #endif
  53 };
  54
  55
  56 inline Duration::Duration(void)
  57 {
  58 #ifdef WIN32
  59         LARGE_INTEGER liFrequency;
  60
  61         QueryPerformanceFrequency(&liFrequency);
  62         m_llFrequency = liFrequency.QuadPart;
  63
  64         // Calibration
  65         Start();
  66         Stop();
  67
  68         m_llCorrection = m_liStop.QuadPart-m_liStart.QuadPart;
  69 #else
  70         // Calibration
  71 //      Start();
  72 //      Stop();
  73
  74 //      m_llCorrection = GetDuration();
  75 #endif
  76 }
  77
  78 inline void Duration::Start(void)
  79 {
  80
  81 #ifdef WIN32
  82         // Ensure we will not be interrupted by any other thread for a while
  83         Sleep(0);
  84         QueryPerformanceCounter(&m_liStart);
  85 #else
  86         GET_TIME(m_liStart);
  87 #endif
  88
  89
  90 }
  91
  92 inline void Duration::Stop(void)
  93 {
  94 #ifdef WIN32
  95         QueryPerformanceCounter(&m_liStop);
  96 #else
  97         GET_TIME(m_liStop);
  98 #endif
  99
 100 }
 101
 102 inline double Duration::GetDuration(void) const
 103 {
 104 #ifdef WIN32
 105         return (double)(m_liStop.QuadPart-m_liStart.QuadPart-m_llCorrection)*1000000.0 / m_llFrequency;
 106 #else
 107         return ELAPSED_TIME_SEC(m_liStart, m_liStop);
 108 #endif
 109 }
 110
 111 inline double Duration::GetDurationInMs(void) const
 112 {
 113 #ifdef WIN32
 114         return (double)(m_liStop.QuadPart-m_liStart.QuadPart-m_llCorrection)*1000000.0 / m_llFrequency /1000.0;
 115 #else
 116         return ELAPSED_TIME_SEC(m_liStart, m_liStop)*1000.0;  ///not sure !!!
 117 #endif
 118 }
 119
 120
 121 #endif // !defined(AFX_DURATION_H__95A8A4BA_3CFB_4ABC_8C48_495328EA1336__INCLUDED_)