kc3-lang/angle/util/linux/LinuxTimer.cpp

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• Author : Shahbaz Youssefi
  Date : 2018-10-22 11:53:51
  Hash : 479918de
  Message : Get absolute time from timers Independent of start()/stop()/getElapsedTime() functionality, getAbsoluteTime() is added to return the time regardless of whether the timer is running. Bug: angleproject:2908 Change-Id: I056aeb6eddfba8757a139934c1cf68e00e860de6 Reviewed-on: https://chromium-review.googlesource.com/c/1296952 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

• util/linux/LinuxTimer.cpp

• //
  // Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // LinuxTimer.cpp: Implementation of a high precision timer class on Linux
  
  #include "linux/LinuxTimer.h"
  #include <iostream>
  
  LinuxTimer::LinuxTimer()
      : mRunning(false)
  {
  }
  
  namespace
  {
  uint64_t getCurrentTimeNs()
  {
      struct timespec currentTime;
      clock_gettime(CLOCK_MONOTONIC, &currentTime);
      return currentTime.tv_sec * 1'000'000'000llu + currentTime.tv_nsec;
  }
  }  // anonymous namespace
  
  void LinuxTimer::start()
  {
      mStartTimeNs = getCurrentTimeNs();
      mRunning = true;
  }
  
  void LinuxTimer::stop()
  {
      mStopTimeNs = getCurrentTimeNs();
      mRunning = false;
  }
  
  double LinuxTimer::getElapsedTime() const
  {
      uint64_t endTimeNs;
      if (mRunning)
      {
          endTimeNs = getCurrentTimeNs();
      }
      else
      {
          endTimeNs = mStopTimeNs;
      }
  
      return (endTimeNs - mStartTimeNs) * 1e-9;
  }
  
  double LinuxTimer::getAbsoluteTime()
  {
      return getCurrentTimeNs() * 1e-9;
  }
  
  Timer *CreateTimer()
  {
      return new LinuxTimer();
  }