summaryrefslogtreecommitdiffstats
path: root/dom/performance/PerformanceService.h
blob: 80ded9b1803d7ef38f7e06812d8ae1e3968b6d01 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
/* -*- 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::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;
};

}  // namespace mozilla::dom

#endif  // dom_performance_PerformanceService_h