Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(70)

Unified Diff: tools/timer/SysTimer_windows.cpp

Issue 1422513003: SkTime::GetNSecs() (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: #else std::chrono Created 5 years, 2 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « tools/timer/SysTimer_windows.h ('k') | tools/timer/Timer.h » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: tools/timer/SysTimer_windows.cpp
diff --git a/tools/timer/SysTimer_windows.cpp b/tools/timer/SysTimer_windows.cpp
deleted file mode 100644
index 8e45b4a68ed3ccabab401ec27f6138e490e56d22..0000000000000000000000000000000000000000
--- a/tools/timer/SysTimer_windows.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "SysTimer_windows.h"
-
-#include <intrin.h>
-
-static ULONGLONG win_cpu_time() {
- FILETIME createTime;
- FILETIME exitTime;
- FILETIME usrTime;
- FILETIME sysTime;
- if (0 == GetProcessTimes(GetCurrentProcess(), &createTime, &exitTime, &sysTime, &usrTime)) {
- return 0;
- }
- ULARGE_INTEGER start_cpu_sys;
- ULARGE_INTEGER start_cpu_usr;
- start_cpu_sys.LowPart = sysTime.dwLowDateTime;
- start_cpu_sys.HighPart = sysTime.dwHighDateTime;
- start_cpu_usr.LowPart = usrTime.dwLowDateTime;
- start_cpu_usr.HighPart = usrTime.dwHighDateTime;
- return start_cpu_sys.QuadPart + start_cpu_usr.QuadPart;
-}
-
-void SysTimer::startCpu() {
- fStartCpu = win_cpu_time();
-}
-
-double SysTimer::endCpu() {
- ULONGLONG end_cpu = win_cpu_time();
- return static_cast<double>(end_cpu - fStartCpu) / 10000.0L;
-}
-
-// On recent Intel chips (roughly, "has Core or Atom in its name") __rdtsc will always tick
-// at the CPU's maximum rate, even while power management clocks the CPU up and down.
-// That's great, because it makes measuring wall time super simple.
-
-void SysTimer::startWall() {
- fStartWall = __rdtsc();
-}
-
-double SysTimer::endWall() {
- unsigned __int64 end = __rdtsc();
-
- // This seems to, weirdly, give the CPU frequency in kHz. That's exactly what we want!
- LARGE_INTEGER freq_khz;
- QueryPerformanceFrequency(&freq_khz);
-
- return static_cast<double>(end - fStartWall) / static_cast<double>(freq_khz.QuadPart);
-}
« no previous file with comments | « tools/timer/SysTimer_windows.h ('k') | tools/timer/Timer.h » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698