mtklein | 9ac68ee | 2014-06-20 11:29:20 -0700 | [diff] [blame^] | 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 | } |