76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include "MainThreadIdlePeriod.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/Preferences.h"
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#include "nsRefreshDriver.h"
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#define DEFAULT_LONG_IDLE_PERIOD 50.0f
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#define DEFAULT_MIN_IDLE_PERIOD 3.0f
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namespace mozilla {
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NS_IMETHODIMP
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MainThreadIdlePeriod::GetIdlePeriodHint(TimeStamp* aIdleDeadline)
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(aIdleDeadline);
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Maybe<TimeStamp> deadline = nsRefreshDriver::GetIdleDeadlineHint();
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if (deadline.isSome()) {
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// If the idle period is too small, then just return a null time
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// to indicate we are busy. Otherwise return the actual deadline.
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TimeDuration minIdlePeriod =
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TimeDuration::FromMilliseconds(GetMinIdlePeriod());
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bool busySoon = deadline.value().IsNull() ||
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(TimeStamp::Now() >= (deadline.value() - minIdlePeriod));
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*aIdleDeadline = busySoon ? TimeStamp() : deadline.value();
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} else {
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*aIdleDeadline =
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TimeStamp::Now() + TimeDuration::FromMilliseconds(GetLongIdlePeriod());
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}
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return NS_OK;
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}
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/* static */ float
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MainThreadIdlePeriod::GetLongIdlePeriod()
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{
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MOZ_ASSERT(NS_IsMainThread());
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static float sLongIdlePeriod = DEFAULT_LONG_IDLE_PERIOD;
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static bool sInitialized = false;
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if (!sInitialized && Preferences::IsServiceAvailable()) {
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sInitialized = true;
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Preferences::AddFloatVarCache(&sLongIdlePeriod, "idle_queue.long_period",
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DEFAULT_LONG_IDLE_PERIOD);
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}
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return sLongIdlePeriod;
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}
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/* static */ float
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MainThreadIdlePeriod::GetMinIdlePeriod()
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{
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MOZ_ASSERT(NS_IsMainThread());
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static float sMinIdlePeriod = DEFAULT_MIN_IDLE_PERIOD;
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static bool sInitialized = false;
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if (!sInitialized && Preferences::IsServiceAvailable()) {
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sInitialized = true;
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Preferences::AddFloatVarCache(&sMinIdlePeriod, "idle_queue.min_period",
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DEFAULT_MIN_IDLE_PERIOD);
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}
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return sMinIdlePeriod;
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}
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} // namespace mozilla
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