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Bug 1313420 - Implement Performance.timeOrigin - part 1

Browse source 
https://hg.mozilla.org/mozilla-central/rev/cf0f72f0b0be
This commit is contained in:
janekptacijarabaci 2018-04-29 12:15:36 +02:00 • committed by Roy Tam
commit ad947fb20a
6 changed files with 117 additions and 1 deletions
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46
dom/performance/PerformanceService.cpp Normal file
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/* -*- 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