зеркало из https://github.com/mozilla/gecko-dev.git
49 строки
1.3 KiB
C++
49 строки
1.3 KiB
C++
/* -*- 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/. */
|
|
|
|
#ifndef dom_performance_PerformanceService_h
|
|
#define dom_performance_PerformanceService_h
|
|
|
|
#include "mozilla/TimeStamp.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsDOMNavigationTiming.h"
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
// This class is thread-safe.
|
|
|
|
// We use this singleton for having the correct value of performance.timeOrigin.
|
|
// This value must be calculated on top of the pair:
|
|
// - mCreationTimeStamp (monotonic clock)
|
|
// - mCreationEpochTime (unix epoch time)
|
|
// These 2 values must be taken "at the same time" in order to be used
|
|
// correctly.
|
|
|
|
class PerformanceService
|
|
{
|
|
public:
|
|
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PerformanceService)
|
|
|
|
static PerformanceService*
|
|
GetOrCreate();
|
|
|
|
DOMHighResTimeStamp
|
|
TimeOrigin(const TimeStamp& aCreationTimeStamp) const;
|
|
|
|
private:
|
|
PerformanceService();
|
|
~PerformanceService() = default;
|
|
|
|
TimeStamp mCreationTimeStamp;
|
|
PRTime mCreationEpochTime;
|
|
};
|
|
|
|
} // dom namespace
|
|
} // mozilla namespace
|
|
|
|
#endif // dom_performance_PerformanceService_h
|