forked from mirrors/gecko-dev
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef dom_performance_PerformanceService_h
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#define dom_performance_PerformanceService_h
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#include "mozilla/TimeStamp.h"
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#include "nsCOMPtr.h"
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#include "nsDOMNavigationTiming.h"
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namespace mozilla {
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namespace dom {
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// This class is thread-safe.
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// We use this singleton for having the correct value of performance.timeOrigin.
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// This value must be calculated on top of the pair:
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// - mCreationTimeStamp (monotonic clock)
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// - mCreationEpochTime (unix epoch time)
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// These 2 values must be taken "at the same time" in order to be used
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// correctly.
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class PerformanceService
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{
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PerformanceService)
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static PerformanceService*
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GetOrCreate();
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DOMHighResTimeStamp
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TimeOrigin(const TimeStamp& aCreationTimeStamp) const;
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private:
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PerformanceService();
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~PerformanceService() = default;
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TimeStamp mCreationTimeStamp;
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PRTime mCreationEpochTime;
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};
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} // dom namespace
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} // mozilla namespace
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#endif // dom_performance_PerformanceService_h
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