1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "BenchSysTimer_windows.h" 9 10 //Time 11 #define WIN32_LEAN_AND_MEAN 1 12 #include <Windows.h> 13 14 static ULONGLONG winCpuTime() { 15 FILETIME createTime; 16 FILETIME exitTime; 17 FILETIME usrTime; 18 FILETIME sysTime; 19 if (0 == GetProcessTimes(GetCurrentProcess() 20 , &createTime, &exitTime 21 , &sysTime, &usrTime)) 22 { 23 return 0; 24 } 25 ULARGE_INTEGER start_cpu_sys; 26 ULARGE_INTEGER start_cpu_usr; 27 start_cpu_sys.LowPart = sysTime.dwLowDateTime; 28 start_cpu_sys.HighPart = sysTime.dwHighDateTime; 29 start_cpu_usr.LowPart = usrTime.dwLowDateTime; 30 start_cpu_usr.HighPart = usrTime.dwHighDateTime; 31 return start_cpu_sys.QuadPart + start_cpu_usr.QuadPart; 32 } 33 34 void BenchSysTimer::startWall() { 35 if (0 == ::QueryPerformanceCounter(&this->fStartWall)) { 36 this->fStartWall.QuadPart = 0; 37 } 38 } 39 void BenchSysTimer::startCpu() { 40 this->fStartCpu = winCpuTime(); 41 } 42 43 double BenchSysTimer::endCpu() { 44 ULONGLONG end_cpu = winCpuTime(); 45 return static_cast<double>((end_cpu - this->fStartCpu)) / 10000.0L; 46 } 47 double BenchSysTimer::endWall() { 48 LARGE_INTEGER end_wall; 49 if (0 == ::QueryPerformanceCounter(&end_wall)) { 50 end_wall.QuadPart = 0; 51 } 52 53 LARGE_INTEGER ticks_elapsed; 54 ticks_elapsed.QuadPart = end_wall.QuadPart - this->fStartWall.QuadPart; 55 56 LARGE_INTEGER frequency; 57 if (0 == ::QueryPerformanceFrequency(&frequency)) { 58 return 0.0L; 59 } else { 60 return static_cast<double>(ticks_elapsed.QuadPart) 61 / static_cast<double>(frequency.QuadPart) 62 * 1000.0L; 63 } 64 } 65
