kc3-lang/angle/util/osx/OSXTimer.cpp

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• Author : Corentin Wallez
  Date : 2015-06-19 15:42:09
  Hash : 87bef77c
  Message : Compile end2end tests on MacOS This includes an implementation of OSX timer and path_utils. BUG=angleproject:891 Change-Id: Id5440a8321bcfd4a61f3fe35b4a3fc0c651f564f Reviewed-on: https://chromium-review.googlesource.com/278211 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>

• util/osx/OSXTimer.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.
  //
  
  // OSXTimer.cpp: Implementation of a high precision timer class on OSX
  
  #include "osx/OSXTimer.h"
  
  #include <CoreServices/CoreServices.h>
  #include <mach/mach.h>
  #include <mach/mach_time.h>
  #include <iostream>
  
  OSXTimer::OSXTimer()
      : mRunning(false)
  {
  }
  
  void OSXTimer::start()
  {
      mStartTime = mach_absolute_time();
      mRunning = true;
  }
  
  void OSXTimer::stop()
  {
      mStopTime = mach_absolute_time();
      mRunning = false;
  }
  
  double OSXTimer::getElapsedTime() const
  {
      // If this is the first time we've run, get the timebase.
      // We can use denom == 0 to indicate that sTimebaseInfo is
      // uninitialised because it makes no sense to have a zero
      // denominator is a fraction.
      static mach_timebase_info_data_t timebaseInfo;
  
      if ( timebaseInfo.denom == 0 )
      {
          mach_timebase_info(&timebaseInfo);
      }
  
      double secondCoeff = timebaseInfo.numer * (1.0 / 1000000000) / timebaseInfo.denom;
  
      if (mRunning)
      {
          return secondCoeff * (mach_absolute_time() - mStartTime);
      }
      else
      {
          return secondCoeff * (mStopTime - mStartTime);
      }
  }
  
  Timer *CreateTimer()
  {
      return new OSXTimer();
  }