timer.h
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00001 // from: http://snipplr.com/view/40650/timer-class-for-both-unixlinuxmac-and-windows-system/
00002 
00004 // How to Use ////
00006 
00007 //#include <iostream>
00008 //#include "timer.h"
00009 //using namespace std;
00010  
00011 //int main()
00012 //{
00013 //    Timer timer;
00014 // 
00015 //    // start timer
00016 //    timer.start();
00017 // 
00018 //    // do something
00019 //    ...
00020 // 
00021 //    // stop timer
00022 //    timer.stop();
00023 // 
00024 //    // print the elapsed time in millisec
00025 //    cout << timer.getElapsedTimeInMilliSec() << " ms.\n";
00026 // 
00027 //    return 0;
00028 //}
00029  
00030  
00032 // Timer.h
00033 // =======
00034 // High Resolution Timer.
00035 // This timer is able to measure the elapsed time with 1 micro-second accuracy
00036 // in both Windows, Linux and Unix system 
00037 //
00038 //  AUTHOR: Song Ho Ahn (song.ahn@gmail.com)
00039 // CREATED: 2003-01-13
00040 // UPDATED: 2006-01-13
00041 //
00042 // Copyright (c) 2003 Song Ho Ahn
00044  
00045 #ifndef TIMER_H_DEF
00046 #define TIMER_H_DEF
00047  
00048 #ifndef __LINUX__   // Windows system specific
00049 #include <windows.h>
00050 #else          // Unix based system specific
00051 #include <sys/time.h>
00052 #endif
00053 
00054 #include <stdlib.h>
00055  
00056  
00057 class Timer
00058 {
00059 public:
00060         // default constructor
00061     Timer()
00062     {
00063     #ifdef WIN32
00064         QueryPerformanceFrequency(&frequency);
00065         startCount.QuadPart = 0;
00066         endCount.QuadPart = 0;
00067     #else
00068         startCount.tv_sec = startCount.tv_usec = 0;
00069         endCount.tv_sec = endCount.tv_usec = 0;
00070     #endif
00071 
00072         stopped = 0;
00073         startTimeInMicroSec = 0;
00074         endTimeInMicroSec = 0;
00075     }
00076 
00077     // default destructor
00078     ~Timer()
00079     {}
00080  
00082     // start timer.
00083     // startCount will be set at this point.
00085     void start()
00086     {
00087         stopped = 0; // reset stop flag
00088     #ifdef WIN32
00089         QueryPerformanceCounter(&startCount);
00090     #else
00091         gettimeofday(&startCount, NULL);
00092     #endif
00093     }
00094 
00096     // stop the timer.
00097     // endCount will be set at this point.
00099     void stop()
00100     {
00101         stopped = 1; // set timer stopped flag
00102 
00103     #ifdef WIN32
00104         QueryPerformanceCounter(&endCount);
00105     #else
00106         gettimeofday(&endCount, NULL);
00107     #endif
00108     }
00109 
00111     // same as getElapsedTimeInSec()
00113     double getElapsedTime()
00114     {
00115         return this->getElapsedTimeInSec();
00116     }
00117 
00119     // divide elapsedTimeInMicroSec by 1000000
00121     double getElapsedTimeInSec()
00122     {
00123         return this->getElapsedTimeInMicroSec() * 0.000001;
00124     }
00125 
00127     // divide elapsedTimeInMicroSec by 1000
00129     double getElapsedTimeInMilliSec()
00130     {
00131         return this->getElapsedTimeInMicroSec() * 0.001;
00132     }
00133 
00135     // compute elapsed time in micro-second resolution.
00136     // other getElapsedTime will call this first, then convert to correspond resolution.
00138     double getElapsedTimeInMicroSec()
00139     {
00140     #ifdef WIN32
00141         if(!stopped)
00142             QueryPerformanceCounter(&endCount);
00143 
00144         startTimeInMicroSec = startCount.QuadPart * (1000000.0 / frequency.QuadPart);
00145         endTimeInMicroSec = endCount.QuadPart * (1000000.0 / frequency.QuadPart);
00146     #else
00147         if(!stopped)
00148             gettimeofday(&endCount, NULL);
00149 
00150         startTimeInMicroSec = (startCount.tv_sec * 1000000.0) + startCount.tv_usec;
00151         endTimeInMicroSec = (endCount.tv_sec * 1000000.0) + endCount.tv_usec;
00152     #endif
00153 
00154         return endTimeInMicroSec - startTimeInMicroSec;
00155     }
00156  
00157  
00158 protected:
00159  
00160  
00161 private:
00162     double startTimeInMicroSec;                 // starting time in micro-second
00163     double endTimeInMicroSec;                   // ending time in micro-second
00164     int    stopped;                             // stop flag 
00165 #ifdef WIN32
00166     LARGE_INTEGER frequency;                    // ticks per second
00167     LARGE_INTEGER startCount;                   //
00168     LARGE_INTEGER endCount;                     //
00169 #else
00170     timeval startCount;                         //
00171     timeval endCount;                           //
00172 #endif
00173 };
00174  
00175 #endif // TIMER_H_DEF
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Author(s): Richard Bormann
autogenerated on Fri Mar 8 2013 15:03:53