Unix/Linux/Mac和Windows系统的计时器类
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////////////////// // How to Use //// ////////////////// #include <iostream> #include "Timer.h" using namespace std; int main() { Timer timer; // start timer timer.start(); // do something ... // stop timer timer.stop(); // print the elapsed time in millisec cout << timer.getElapsedTimeInMilliSec() << " ms. "; return 0; } ////////////////////////////////////////////////////////////////////////////// // Timer.h // ======= // High Resolution Timer. // This timer is able to measure the elapsed time with 1 micro-second accuracy // in both Windows, Linux and Unix system // // AUTHOR: Song Ho Ahn ([email protected]) // CREATED: 2003-01-13 // UPDATED: 2006-01-13 // // Copyright (c) 2003 Song Ho Ahn ////////////////////////////////////////////////////////////////////////////// #ifndef TIMER_H_DEF #define TIMER_H_DEF #ifdef WIN32 // Windows system specific #include <windows.h> #else // Unix based system specific #include <sys/time.h> #endif class Timer { public: Timer(); // default constructor ~Timer(); // default destructor void start(); // start timer void stop(); // stop the timer double getElapsedTime(); // get elapsed time in second double getElapsedTimeInSec(); // get elapsed time in second (same as getElapsedTime) double getElapsedTimeInMilliSec(); // get elapsed time in milli-second double getElapsedTimeInMicroSec(); // get elapsed time in micro-second protected: private: double startTimeInMicroSec; // starting time in micro-second double endTimeInMicroSec; // ending time in micro-second int stopped; // stop flag #ifdef WIN32 LARGE_INTEGER frequency; // ticks per second LARGE_INTEGER startCount; // LARGE_INTEGER endCount; // #else timeval startCount; // timeval endCount; // #endif }; #endif // TIMER_H_DEF ////////////////////////////////////////////////////////////////////////////// // Timer.cpp // ========= // High Resolution Timer. // This timer is able to measure the elapsed time with 1 micro-second accuracy // in both Windows, Linux and Unix system // // AUTHOR: Song Ho Ahn ([email protected]) // CREATED: 2003-01-13 // UPDATED: 2006-01-13 // // Copyright (c) 2003 Song Ho Ahn ////////////////////////////////////////////////////////////////////////////// #include "Timer.h" #include <stdlib.h> /////////////////////////////////////////////////////////////////////////////// // constructor /////////////////////////////////////////////////////////////////////////////// Timer::Timer() { #ifdef WIN32 QueryPerformanceFrequency(&frequency); startCount.QuadPart = 0; endCount.QuadPart = 0; #else startCount.tv_sec = startCount.tv_usec = 0; endCount.tv_sec = endCount.tv_usec = 0; #endif stopped = 0; startTimeInMicroSec = 0; endTimeInMicroSec = 0; } /////////////////////////////////////////////////////////////////////////////// // distructor /////////////////////////////////////////////////////////////////////////////// Timer::~Timer() { } /////////////////////////////////////////////////////////////////////////////// // start timer. // startCount will be set at this point. /////////////////////////////////////////////////////////////////////////////// void Timer::start() { stopped = 0; // reset stop flag #ifdef WIN32 QueryPerformanceCounter(&startCount); #else gettimeofday(&startCount, NULL); #endif } /////////////////////////////////////////////////////////////////////////////// // stop the timer. // endCount will be set at this point. /////////////////////////////////////////////////////////////////////////////// void Timer::stop() { stopped = 1; // set timer stopped flag #ifdef WIN32 QueryPerformanceCounter(&endCount); #else gettimeofday(&endCount, NULL); #endif } /////////////////////////////////////////////////////////////////////////////// // compute elapsed time in micro-second resolution. // other getElapsedTime will call this first, then convert to correspond resolution. /////////////////////////////////////////////////////////////////////////////// double Timer::getElapsedTimeInMicroSec() { #ifdef WIN32 if(!stopped) QueryPerformanceCounter(&endCount); startTimeInMicroSec = startCount.QuadPart * (1000000.0 / frequency.QuadPart); endTimeInMicroSec = endCount.QuadPart * (1000000.0 / frequency.QuadPart); #else if(!stopped) gettimeofday(&endCount, NULL); startTimeInMicroSec = (startCount.tv_sec * 1000000.0) + startCount.tv_usec; endTimeInMicroSec = (endCount.tv_sec * 1000000.0) + endCount.tv_usec; #endif return endTimeInMicroSec - startTimeInMicroSec; } /////////////////////////////////////////////////////////////////////////////// // divide elapsedTimeInMicroSec by 1000 /////////////////////////////////////////////////////////////////////////////// double Timer::getElapsedTimeInMilliSec() { return this->getElapsedTimeInMicroSec() * 0.001; } /////////////////////////////////////////////////////////////////////////////// // divide elapsedTimeInMicroSec by 1000000 /////////////////////////////////////////////////////////////////////////////// double Timer::getElapsedTimeInSec() { return this->getElapsedTimeInMicroSec() * 0.000001; } /////////////////////////////////////////////////////////////////////////////// // same as getElapsedTimeInSec() /////////////////////////////////////////////////////////////////////////////// double Timer::getElapsedTime() { return this->getElapsedTimeInSec(); }
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