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