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Unified Diff: chrome/browser/sync/util/highres_timer-linux.h

Issue 193103: Build sync engine as part of the browser build (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 11 years, 3 months ago
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Index: chrome/browser/sync/util/highres_timer-linux.h
===================================================================
--- chrome/browser/sync/util/highres_timer-linux.h (revision 26149)
+++ chrome/browser/sync/util/highres_timer-linux.h (working copy)
@@ -1,79 +0,0 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-// High resolution timer functions for use in Linux.
-
-#ifndef CHROME_BROWSER_SYNC_UTIL_HIGHRES_TIMER_LINUX_H_
-#define CHROME_BROWSER_SYNC_UTIL_HIGHRES_TIMER_LINUX_H_
-
-#include "base/basictypes.h"
-
-#include <sys/time.h>
-
-const uint64 MICROS_IN_SECOND = 1000000L;
-
-// A handy class for reliably measuring wall-clock time with decent resolution.
-//
-// We want to measure time with high resolution on Linux. What to do?
-//
-// RDTSC? Sure, but how do you convert it to wall clock time?
-// clock_gettime? It's not in all Linuxes.
-//
-// Let's just use gettimeofday; it's good to the microsecond.
-class HighresTimer {
- public:
- // Captures the current start time.
- HighresTimer();
-
- // Captures the current tick, can be used to reset a timer for reuse.
- void Start();
-
- // Returns the elapsed ticks with full resolution.
- uint64 GetElapsedTicks() const;
-
- // Returns the elapsed time in milliseconds, rounded to the nearest
- // millisecond.
- uint64 GetElapsedMs() const;
-
- // Returns the elapsed time in seconds, rounded to the nearest second.
- uint64 GetElapsedSec() const;
-
- uint64 start_ticks() const { return start_ticks_; }
-
- // Returns timer frequency from cache, should be less overhead than
- // ::QueryPerformanceFrequency.
- static uint64 GetTimerFrequency();
- // Returns current ticks.
- static uint64 GetCurrentTicks();
-
- private:
- // Captured start time.
- uint64 start_ticks_;
-};
-
-inline HighresTimer::HighresTimer() {
- Start();
-}
-
-inline void HighresTimer::Start() {
- start_ticks_ = GetCurrentTicks();
-}
-
-inline uint64 HighresTimer::GetTimerFrequency() {
- // Fixed; one "tick" is one microsecond.
- return MICROS_IN_SECOND;
-}
-
-inline uint64 HighresTimer::GetCurrentTicks() {
- timeval tv;
- gettimeofday(&tv, 0);
-
- return tv.tv_sec * MICROS_IN_SECOND + tv.tv_usec;
-}
-
-inline uint64 HighresTimer::GetElapsedTicks() const {
- return start_ticks_ - GetCurrentTicks();
-}
-
-#endif // CHROME_BROWSER_SYNC_UTIL_HIGHRES_TIMER_LINUX_H_
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