/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "PerformanceService.h"

#include "mozilla/ClearOnShutdown.h"

#include "mozilla/StaticMutex.h"

#include "mozilla/StaticPtr.h"

namespace mozilla {

namespace dom {

static StaticRefPtr<PerformanceService> gPerformanceService;

static StaticMutex gPerformanceServiceMutex;

/* static */ PerformanceService*

PerformanceService::GetOrCreate()

{

  StaticMutexAutoLock al(gPerformanceServiceMutex);

  if (!gPerformanceService) {

    gPerformanceService = new PerformanceService();

    ClearOnShutdown(&gPerformanceService);

  }

  return gPerformanceService;

}

DOMHighResTimeStamp

PerformanceService::TimeOrigin(const TimeStamp& aCreationTimeStamp) const

{

  return (aCreationTimeStamp - mCreationTimeStamp).ToMilliseconds() +

           (mCreationEpochTime / PR_USEC_PER_MSEC);

}

PerformanceService::PerformanceService()

{

  mCreationTimeStamp = TimeStamp::Now();

  mCreationEpochTime = PR_Now();

}

} // dom namespace

} // mozilla namespace