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gecko-dev/dom/base/TimeoutManager.cpp

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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 "TimeoutManager.h"
#include "nsGlobalWindow.h"
#include "mozilla/Logging.h"
#include "mozilla/PerformanceCounter.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_privacy.h"
#include "mozilla/Telemetry.h"
#include "mozilla/ThrottledEventQueue.h"
#include "mozilla/TimeStamp.h"
#include "nsINamed.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/PopupBlocker.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/TimeoutHandler.h"
#include "TimeoutExecutor.h"
#include "TimeoutBudgetManager.h"
#include "mozilla/net/WebSocketEventService.h"
#include "mozilla/MediaManager.h"
#ifdef MOZ_GECKO_PROFILER
# include "ProfilerMarkerPayload.h"
#endif
using namespace mozilla;
using namespace mozilla::dom;
LazyLogModule gTimeoutLog("Timeout");
static int32_t gRunningTimeoutDepth = 0;
// static
const uint32_t TimeoutManager::InvalidFiringId = 0;
namespace {
double GetRegenerationFactor(bool aIsBackground) {
// Lookup function for "dom.timeout.{background,
// foreground}_budget_regeneration_rate".
// Returns the rate of regeneration of the execution budget as a
// fraction. If the value is 1.0, the amount of time regenerated is
// equal to time passed. At this rate we regenerate 1ms/ms. If it is
// 0.01 the amount regenerated is 1% of time passed. At this rate we
// regenerate 1ms/100ms, etc.
double denominator = std::max(
aIsBackground
? StaticPrefs::dom_timeout_background_budget_regeneration_rate()
: StaticPrefs::dom_timeout_foreground_budget_regeneration_rate(),
1);
return 1.0 / denominator;
}
TimeDuration GetMaxBudget(bool aIsBackground) {
// Lookup function for "dom.timeout.{background,
// foreground}_throttling_max_budget".
// Returns how high a budget can be regenerated before being
// clamped. If this value is less or equal to zero,
// TimeDuration::Forever() is implied.
int32_t maxBudget =
aIsBackground
? StaticPrefs::dom_timeout_background_throttling_max_budget()
: StaticPrefs::dom_timeout_foreground_throttling_max_budget();
return maxBudget > 0 ? TimeDuration::FromMilliseconds(maxBudget)
: TimeDuration::Forever();
}
TimeDuration GetMinBudget(bool aIsBackground) {
// The minimum budget is computed by looking up the maximum allowed
// delay and computing how long time it would take to regenerate
// that budget using the regeneration factor. This number is
// expected to be negative.
return TimeDuration::FromMilliseconds(
-StaticPrefs::dom_timeout_budget_throttling_max_delay() /
std::max(
aIsBackground
? StaticPrefs::dom_timeout_background_budget_regeneration_rate()
: StaticPrefs::dom_timeout_foreground_budget_regeneration_rate(),
1));
}
} // namespace
//
bool TimeoutManager::IsBackground() const {
return !IsActive() && mWindow.IsBackgroundInternal();
}
bool TimeoutManager::IsActive() const {
// A window is considered active if:
// * It is a chrome window
// * It is playing audio
//
// Note that a window can be considered active if it is either in the
// foreground or in the background.
if (mWindow.IsChromeWindow()) {
return true;
}
// Check if we're playing audio
if (mWindow.IsPlayingAudio()) {
return true;
}
return false;
}
void TimeoutManager::SetLoading(bool value) {
// When moving from loading to non-loading, we may need to
// reschedule any existing timeouts from the idle timeout queue
// to the normal queue.
MOZ_LOG(gTimeoutLog, LogLevel::Debug, ("%p: SetLoading(%d)", this, value));
if (mIsLoading && !value) {
MoveIdleToActive();
}
// We don't immediately move existing timeouts to the idle queue if we
// move to loading. When they would have fired, we'll see we're loading
// and move them then.
mIsLoading = value;
}
void TimeoutManager::MoveIdleToActive() {
uint32_t num = 0;
TimeStamp when;
#if MOZ_GECKO_PROFILER
TimeStamp now;
#endif
// Ensure we maintain the ordering of timeouts, so timeouts
// never fire before a timeout set for an earlier time, or
// before a timeout for the same time already submitted.
// See https://html.spec.whatwg.org/#dom-settimeout #16 and #17
while (RefPtr<Timeout> timeout = mIdleTimeouts.GetLast()) {
if (num == 0) {
when = timeout->When();
}
timeout->remove();
mTimeouts.InsertFront(timeout);
#if MOZ_GECKO_PROFILER
if (profiler_can_accept_markers()) {
if (num == 0) {
now = TimeStamp::Now();
}
TimeDuration elapsed = now - timeout->SubmitTime();
TimeDuration target = timeout->When() - timeout->SubmitTime();
TimeDuration delta = now - timeout->When();
nsPrintfCString marker(
"Releasing deferred setTimeout() for %dms (original target time was "
"%dms (%dms delta))",
int(elapsed.ToMilliseconds()), int(target.ToMilliseconds()),
int(delta.ToMilliseconds()));
// don't have end before start...
PROFILER_ADD_MARKER_WITH_PAYLOAD(
"setTimeout deferred release", DOM, TextMarkerPayload,
(marker, delta.ToMilliseconds() >= 0 ? timeout->When() : now, now,
Some(mWindow.WindowID())));
}
#endif
num++;
}
if (num > 0) {
MOZ_ALWAYS_SUCCEEDS(MaybeSchedule(when));
mIdleExecutor->Cancel();
}
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("%p: Moved %d timeouts from Idle to active", this, num));
}
uint32_t TimeoutManager::CreateFiringId() {
uint32_t id = mNextFiringId;
mNextFiringId += 1;
if (mNextFiringId == InvalidFiringId) {
mNextFiringId += 1;
}
mFiringIdStack.AppendElement(id);
return id;
}
void TimeoutManager::DestroyFiringId(uint32_t aFiringId) {
MOZ_DIAGNOSTIC_ASSERT(!mFiringIdStack.IsEmpty());
MOZ_DIAGNOSTIC_ASSERT(mFiringIdStack.LastElement() == aFiringId);
mFiringIdStack.RemoveLastElement();
}
bool TimeoutManager::IsValidFiringId(uint32_t aFiringId) const {
return !IsInvalidFiringId(aFiringId);
}
TimeDuration TimeoutManager::MinSchedulingDelay() const {
if (IsActive()) {
return TimeDuration();
}
bool isBackground = mWindow.IsBackgroundInternal();
// If a window isn't active as defined by TimeoutManager::IsActive()
// and we're throttling timeouts using an execution budget, we
// should adjust the minimum scheduling delay if we have used up all
// of our execution budget. Note that a window can be active or
// inactive regardless of wether it is in the foreground or in the
// background. Throttling using a budget depends largely on the
// regeneration factor, which can be specified separately for
// foreground and background windows.
//
// The value that we compute is the time in the future when we again
// have a positive execution budget. We do this by taking the
// execution budget into account, which if it positive implies that
// we have time left to execute, and if it is negative implies that
// we should throttle it until the budget again is positive. The
// factor used is the rate of budget regeneration.
//
// We clamp the delay to be less than or equal to
// "dom.timeout.budget_throttling_max_delay" to not entirely starve
// the timeouts.
//
// Consider these examples assuming we should throttle using
// budgets:
//
// mExecutionBudget is 20ms
// factor is 1, which is 1 ms/ms
// delay is 0ms
// then we will compute the minimum delay:
// max(0, - 20 * 1) = 0
//
// mExecutionBudget is -50ms
// factor is 0.1, which is 1 ms/10ms
// delay is 1000ms
// then we will compute the minimum delay:
// max(1000, - (- 50) * 1/0.1) = max(1000, 500) = 1000
//
// mExecutionBudget is -15ms
// factor is 0.01, which is 1 ms/100ms
// delay is 1000ms
// then we will compute the minimum delay:
// max(1000, - (- 15) * 1/0.01) = max(1000, 1500) = 1500
TimeDuration unthrottled =
isBackground ? TimeDuration::FromMilliseconds(
StaticPrefs::dom_min_background_timeout_value())
: TimeDuration();
if (BudgetThrottlingEnabled(isBackground) &&
mExecutionBudget < TimeDuration()) {
// Only throttle if execution budget is less than 0
double factor = 1.0 / GetRegenerationFactor(mWindow.IsBackgroundInternal());
return TimeDuration::Max(unthrottled, -mExecutionBudget.MultDouble(factor));
}
//
return unthrottled;
}
nsresult TimeoutManager::MaybeSchedule(const TimeStamp& aWhen,
const TimeStamp& aNow) {
MOZ_DIAGNOSTIC_ASSERT(mExecutor);
// Before we can schedule the executor we need to make sure that we
// have an updated execution budget.
UpdateBudget(aNow);
return mExecutor->MaybeSchedule(aWhen, MinSchedulingDelay());
}
bool TimeoutManager::IsInvalidFiringId(uint32_t aFiringId) const {
// Check the most common ways to invalidate a firing id first.
// These should be quite fast.
if (aFiringId == InvalidFiringId || mFiringIdStack.IsEmpty()) {
return true;
}
if (mFiringIdStack.Length() == 1) {
return mFiringIdStack[0] != aFiringId;
}
// Next do a range check on the first and last items in the stack
// of active firing ids. This is a bit slower.
uint32_t low = mFiringIdStack[0];
uint32_t high = mFiringIdStack.LastElement();
MOZ_DIAGNOSTIC_ASSERT(low != high);
if (low > high) {
// If the first element is bigger than the last element in the
// stack, that means mNextFiringId wrapped around to zero at
// some point.
std::swap(low, high);
}
MOZ_DIAGNOSTIC_ASSERT(low < high);
if (aFiringId < low || aFiringId > high) {
return true;
}
// Finally, fall back to verifying the firing id is not anywhere
// in the stack. This could be slow for a large stack, but that
// should be rare. It can only happen with deeply nested event
// loop spinning. For example, a page that does a lot of timers
// and a lot of sync XHRs within those timers could be slow here.
return !mFiringIdStack.Contains(aFiringId);
}
// The number of nested timeouts before we start clamping. HTML says 5.
#define DOM_CLAMP_TIMEOUT_NESTING_LEVEL 5u
TimeDuration TimeoutManager::CalculateDelay(Timeout* aTimeout) const {
MOZ_DIAGNOSTIC_ASSERT(aTimeout);
TimeDuration result = aTimeout->mInterval;
if (aTimeout->mNestingLevel >= DOM_CLAMP_TIMEOUT_NESTING_LEVEL) {
uint32_t minTimeoutValue = StaticPrefs::dom_min_timeout_value();
result = TimeDuration::Max(result,
TimeDuration::FromMilliseconds(minTimeoutValue));
}
return result;
}
PerformanceCounter* TimeoutManager::GetPerformanceCounter() {
Document* doc = mWindow.GetDocument();
if (doc) {
dom::DocGroup* docGroup = doc->GetDocGroup();
if (docGroup) {
return docGroup->GetPerformanceCounter();
}
}
return nullptr;
}
void TimeoutManager::RecordExecution(Timeout* aRunningTimeout,
Timeout* aTimeout) {
TimeoutBudgetManager& budgetManager = TimeoutBudgetManager::Get();
TimeStamp now = TimeStamp::Now();
if (aRunningTimeout) {
// If we're running a timeout callback, record any execution until
// now.
TimeDuration duration = budgetManager.RecordExecution(now, aRunningTimeout);
UpdateBudget(now, duration);
// This is an ad-hoc way to use the counters for the timers
// that should be removed at somepoint. See Bug 1482834
PerformanceCounter* counter = GetPerformanceCounter();
if (counter) {
counter->IncrementExecutionDuration(duration.ToMicroseconds());
}
}
if (aTimeout) {
// If we're starting a new timeout callback, start recording.
budgetManager.StartRecording(now);
PerformanceCounter* counter = GetPerformanceCounter();
if (counter) {
counter->IncrementDispatchCounter(DispatchCategory(TaskCategory::Timer));
}
} else {
// Else stop by clearing the start timestamp.
budgetManager.StopRecording();
}
}
void TimeoutManager::UpdateBudget(const TimeStamp& aNow,
const TimeDuration& aDuration) {
if (mWindow.IsChromeWindow()) {
return;
}
// The budget is adjusted by increasing it with the time since the
// last budget update factored with the regeneration rate. If a
// runnable has executed, subtract that duration from the
// budget. The budget updated without consideration of wether the
// window is active or not. If throttling is enabled and the window
// is active and then becomes inactive, an overdrawn budget will
// still be counted against the minimum delay.
bool isBackground = mWindow.IsBackgroundInternal();
if (BudgetThrottlingEnabled(isBackground)) {
double factor = GetRegenerationFactor(isBackground);
TimeDuration regenerated = (aNow - mLastBudgetUpdate).MultDouble(factor);
// Clamp the budget to the range of minimum and maximum allowed budget.
mExecutionBudget = TimeDuration::Max(
GetMinBudget(isBackground),
TimeDuration::Min(GetMaxBudget(isBackground),
mExecutionBudget - aDuration + regenerated));
} else {
// If budget throttling isn't enabled, reset the execution budget
// to the max budget specified in preferences. Always doing this
// will catch the case of BudgetThrottlingEnabled going from
// returning true to returning false. This prevent us from looping
// in RunTimeout, due to totalTimeLimit being set to zero and no
// timeouts being executed, even though budget throttling isn't
// active at the moment.
mExecutionBudget = GetMaxBudget(isBackground);
}
mLastBudgetUpdate = aNow;
}
size_t TimeoutManager::GetNumPendingInputs() {
ContentChild* contentChild = ContentChild::GetSingleton();
mozilla::ipc::MessageChannel* channel =
contentChild ? contentChild->GetIPCChannel() : nullptr;
if (channel) {
size_t count = 0;
channel->PeekMessages([&count](const IPC::Message& aMsg) -> bool {
if (nsContentUtils::IsMessageCriticalInputEvent(aMsg)) {
// The max number we can record in the telemetry is 80,
// so we don't need to continue the counting.
if (++count > 80) {
return false;
}
}
return true;
});
return count;
}
return 0;
}
// The longest interval (as PRIntervalTime) we permit, or that our
// timer code can handle, really. See DELAY_INTERVAL_LIMIT in
// nsTimerImpl.h for details.
#define DOM_MAX_TIMEOUT_VALUE DELAY_INTERVAL_LIMIT
uint32_t TimeoutManager::sNestingLevel = 0;
TimeoutManager::TimeoutManager(nsGlobalWindowInner& aWindow,
uint32_t aMaxIdleDeferMS)
: mWindow(aWindow),
mExecutor(new TimeoutExecutor(this, false, 0)),
mIdleExecutor(new TimeoutExecutor(this, true, aMaxIdleDeferMS)),
mTimeouts(*this),
mTimeoutIdCounter(1),
mNextFiringId(InvalidFiringId + 1),
#ifdef DEBUG
mFiringIndex(0),
mLastFiringIndex(-1),
#endif
mRunningTimeout(nullptr),
mIdleTimeouts(*this),
mIdleCallbackTimeoutCounter(1),
mLastBudgetUpdate(TimeStamp::Now()),
mExecutionBudget(GetMaxBudget(mWindow.IsBackgroundInternal())),
mThrottleTimeouts(false),
mThrottleTrackingTimeouts(false),
mBudgetThrottleTimeouts(false),
mIsLoading(false) {
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("TimeoutManager %p created, tracking bucketing %s\n", this,
StaticPrefs::privacy_trackingprotection_annotate_channels()
? "enabled"
: "disabled"));
}
TimeoutManager::~TimeoutManager() {
MOZ_DIAGNOSTIC_ASSERT(mWindow.IsDying());
MOZ_DIAGNOSTIC_ASSERT(!mThrottleTimeoutsTimer);
mExecutor->Shutdown();
mIdleExecutor->Shutdown();
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("TimeoutManager %p destroyed\n", this));
}
uint32_t TimeoutManager::GetTimeoutId(Timeout::Reason aReason) {
switch (aReason) {
case Timeout::Reason::eIdleCallbackTimeout:
return ++mIdleCallbackTimeoutCounter;
case Timeout::Reason::eTimeoutOrInterval:
default:
return ++mTimeoutIdCounter;
}
}
bool TimeoutManager::IsRunningTimeout() const { return mRunningTimeout; }
nsresult TimeoutManager::SetTimeout(TimeoutHandler* aHandler, int32_t interval,
bool aIsInterval, Timeout::Reason aReason,
int32_t* aReturn) {
// If we don't have a document (we could have been unloaded since
// the call to setTimeout was made), do nothing.
nsCOMPtr<Document> doc = mWindow.GetExtantDoc();
if (!doc) {
return NS_OK;
}
// Disallow negative intervals.
interval = std::max(0, interval);
// Make sure we don't proceed with an interval larger than our timer
// code can handle. (Note: we already forced |interval| to be non-negative,
// so the uint32_t cast (to avoid compiler warnings) is ok.)
uint32_t maxTimeoutMs = PR_IntervalToMilliseconds(DOM_MAX_TIMEOUT_VALUE);
if (static_cast<uint32_t>(interval) > maxTimeoutMs) {
interval = maxTimeoutMs;
}
RefPtr<Timeout> timeout = new Timeout();
#ifdef DEBUG
timeout->mFiringIndex = -1;
#endif
timeout->mWindow = &mWindow;
timeout->mIsInterval = aIsInterval;
timeout->mInterval = TimeDuration::FromMilliseconds(interval);
timeout->mScriptHandler = aHandler;
timeout->mReason = aReason;
// No popups from timeouts by default
timeout->mPopupState = PopupBlocker::openAbused;
timeout->mNestingLevel = sNestingLevel < DOM_CLAMP_TIMEOUT_NESTING_LEVEL
? sNestingLevel + 1
: sNestingLevel;
// Now clamp the actual interval we will use for the timer based on
TimeDuration realInterval = CalculateDelay(timeout);
TimeStamp now = TimeStamp::Now();
timeout->SetWhenOrTimeRemaining(now, realInterval);
// If we're not suspended, then set the timer.
if (!mWindow.IsSuspended()) {
nsresult rv = MaybeSchedule(timeout->When(), now);
if (NS_FAILED(rv)) {
return rv;
}
}
if (gRunningTimeoutDepth == 0 &&
PopupBlocker::GetPopupControlState() < PopupBlocker::openBlocked) {
// This timeout is *not* set from another timeout and it's set
// while popups are enabled. Propagate the state to the timeout if
// its delay (interval) is equal to or less than what
// "dom.disable_open_click_delay" is set to (in ms).
// This is checking |interval|, not realInterval, on purpose,
// because our lower bound for |realInterval| could be pretty high
// in some cases.
if (interval <= StaticPrefs::dom_disable_open_click_delay()) {
timeout->mPopupState = PopupBlocker::GetPopupControlState();
}
}
Timeouts::SortBy sort(mWindow.IsFrozen() ? Timeouts::SortBy::TimeRemaining
: Timeouts::SortBy::TimeWhen);
timeout->mTimeoutId = GetTimeoutId(aReason);
mTimeouts.Insert(timeout, sort);
*aReturn = timeout->mTimeoutId;
MOZ_LOG(
gTimeoutLog, LogLevel::Debug,
("Set%s(TimeoutManager=%p, timeout=%p, delay=%i, "
"minimum=%f, throttling=%s, state=%s(%s), realInterval=%f) "
"returned timeout ID %u, budget=%d\n",
aIsInterval ? "Interval" : "Timeout", this, timeout.get(), interval,
(CalculateDelay(timeout) - timeout->mInterval).ToMilliseconds(),
mThrottleTimeouts ? "yes" : (mThrottleTimeoutsTimer ? "pending" : "no"),
IsActive() ? "active" : "inactive",
mWindow.IsBackgroundInternal() ? "background" : "foreground",
realInterval.ToMilliseconds(), timeout->mTimeoutId,
int(mExecutionBudget.ToMilliseconds())));
return NS_OK;
}
// Make sure we clear it no matter which list it's in
void TimeoutManager::ClearTimeout(int32_t aTimerId, Timeout::Reason aReason) {
if (ClearTimeoutInternal(aTimerId, aReason, false) ||
mIdleTimeouts.IsEmpty()) {
return; // no need to check the other list if we cleared the timeout
}
ClearTimeoutInternal(aTimerId, aReason, true);
}
bool TimeoutManager::ClearTimeoutInternal(int32_t aTimerId,
Timeout::Reason aReason,
bool aIsIdle) {
uint32_t timerId = (uint32_t)aTimerId;
Timeouts& timeouts = aIsIdle ? mIdleTimeouts : mTimeouts;
RefPtr<TimeoutExecutor>& executor = aIsIdle ? mIdleExecutor : mExecutor;
bool deferredDeletion = false;
Timeout* timeout = timeouts.GetTimeout(timerId, aReason);
if (!timeout) {
return false;
}
bool firstTimeout = timeout == timeouts.GetFirst();
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("%s(TimeoutManager=%p, timeout=%p, ID=%u)\n",
timeout->mReason == Timeout::Reason::eIdleCallbackTimeout
? "CancelIdleCallback"
: timeout->mIsInterval ? "ClearInterval" : "ClearTimeout",
this, timeout, timeout->mTimeoutId));
if (timeout->mRunning) {
/* We're running from inside the timeout. Mark this
timeout for deferred deletion by the code in
RunTimeout() */
timeout->mIsInterval = false;
deferredDeletion = true;
} else {
/* Delete the aTimeout from the pending aTimeout list */
timeout->remove();
}
// We don't need to reschedule the executor if any of the following are true:
// * If the we weren't cancelling the first timeout, then the executor's
// state doesn't need to change. It will only reflect the next soonest
// Timeout.
// * If we did cancel the first Timeout, but its currently running, then
// RunTimeout() will handle rescheduling the executor.
// * If the window has become suspended then we should not start executing
// Timeouts.
if (!firstTimeout || deferredDeletion || mWindow.IsSuspended()) {
return true;
}
// Stop the executor and restart it at the next soonest deadline.
executor->Cancel();
Timeout* nextTimeout = timeouts.GetFirst();
if (nextTimeout) {
if (aIsIdle) {
MOZ_ALWAYS_SUCCEEDS(
executor->MaybeSchedule(nextTimeout->When(), TimeDuration(0)));
} else {
MOZ_ALWAYS_SUCCEEDS(MaybeSchedule(nextTimeout->When()));
}
}
return true;
}
void TimeoutManager::RunTimeout(const TimeStamp& aNow,
const TimeStamp& aTargetDeadline,
bool aProcessIdle) {
MOZ_DIAGNOSTIC_ASSERT(!aNow.IsNull());
MOZ_DIAGNOSTIC_ASSERT(!aTargetDeadline.IsNull());
MOZ_ASSERT_IF(mWindow.IsFrozen(), mWindow.IsSuspended());
if (mWindow.IsSuspended()) {
return;
}
Timeouts& timeouts(aProcessIdle ? mIdleTimeouts : mTimeouts);
// Limit the overall time spent in RunTimeout() to reduce jank.
uint32_t totalTimeLimitMS =
std::max(1u, StaticPrefs::dom_timeout_max_consecutive_callbacks_ms());
const TimeDuration totalTimeLimit =
TimeDuration::Min(TimeDuration::FromMilliseconds(totalTimeLimitMS),
TimeDuration::Max(TimeDuration(), mExecutionBudget));
// Allow up to 25% of our total time budget to be used figuring out which
// timers need to run. This is the initial loop in this method.
const TimeDuration initialTimeLimit =
TimeDuration::FromMilliseconds(totalTimeLimit.ToMilliseconds() / 4);
// Ammortize overhead from from calling TimeStamp::Now() in the initial
// loop, though, by only checking for an elapsed limit every N timeouts.
const uint32_t kNumTimersPerInitialElapsedCheck = 100;
// Start measuring elapsed time immediately. We won't potentially expire
// the time budget until at least one Timeout has run, though.
TimeStamp now(aNow);
TimeStamp start = now;
uint32_t firingId = CreateFiringId();
auto guard = MakeScopeExit([&] { DestroyFiringId(firingId); });
// Make sure that the window and the script context don't go away as
// a result of running timeouts
RefPtr<nsGlobalWindowInner> window(&mWindow);
// Accessing members of mWindow here is safe, because the lifetime of
// TimeoutManager is the same as the lifetime of the containing
// nsGlobalWindow.
// A native timer has gone off. See which of our timeouts need
// servicing
TimeStamp deadline;
if (aTargetDeadline > now) {
// The OS timer fired early (which can happen due to the timers
// having lower precision than TimeStamp does). Set |deadline| to
// be the time when the OS timer *should* have fired so that any
// timers that *should* have fired *will* be fired now.
deadline = aTargetDeadline;
} else {
deadline = now;
}
TimeStamp nextDeadline;
uint32_t numTimersToRun = 0;
// The timeout list is kept in deadline order. Discover the latest timeout
// whose deadline has expired. On some platforms, native timeout events fire
// "early", but we handled that above by setting deadline to aTargetDeadline
// if the timer fired early. So we can stop walking if we get to timeouts
// whose When() is greater than deadline, since once that happens we know
// nothing past that point is expired.
for (Timeout* timeout = timeouts.GetFirst(); timeout != nullptr;
timeout = timeout->getNext()) {
if (totalTimeLimit.IsZero() || timeout->When() > deadline) {
nextDeadline = timeout->When();
break;
}
if (IsInvalidFiringId(timeout->mFiringId)) {
// Mark any timeouts that are on the list to be fired with the
// firing depth so that we can reentrantly run timeouts
timeout->mFiringId = firingId;
numTimersToRun += 1;
// Run only a limited number of timers based on the configured maximum.
if (numTimersToRun % kNumTimersPerInitialElapsedCheck == 0) {
now = TimeStamp::Now();
TimeDuration elapsed(now - start);
if (elapsed >= initialTimeLimit) {
nextDeadline = timeout->When();
break;
}
}
}
}
if (aProcessIdle) {
MOZ_LOG(
gTimeoutLog, LogLevel::Debug,
("Running %u deferred timeouts on idle (TimeoutManager=%p), "
"nextDeadline = %gms from now",
numTimersToRun, this,
nextDeadline.IsNull() ? 0.0 : (nextDeadline - now).ToMilliseconds()));
}
now = TimeStamp::Now();
// Wherever we stopped in the timer list, schedule the executor to
// run for the next unexpired deadline. Note, this *must* be done
// before we start executing any content script handlers. If one
// of them spins the event loop the executor must already be scheduled
// in order for timeouts to fire properly.
if (!nextDeadline.IsNull()) {
// Note, we verified the window is not suspended at the top of
// method and the window should not have been suspended while
// executing the loop above since it doesn't call out to js.
MOZ_DIAGNOSTIC_ASSERT(!mWindow.IsSuspended());
if (aProcessIdle) {
// We don't want to update timing budget for idle queue firings, and
// all timeouts in the IdleTimeouts list have hit their deadlines,
// and so should run as soon as possible.
MOZ_ALWAYS_SUCCEEDS(
mIdleExecutor->MaybeSchedule(nextDeadline, TimeDuration()));
} else {
MOZ_ALWAYS_SUCCEEDS(MaybeSchedule(nextDeadline, now));
}
}
// Maybe the timeout that the event was fired for has been deleted
// and there are no others timeouts with deadlines that make them
// eligible for execution yet. Go away.
if (!numTimersToRun) {
return;
}
// Now we need to search the normal and tracking timer list at the same
// time to run the timers in the scheduled order.
// We stop iterating each list when we go past the last expired timeout from
// that list that we have observed above. That timeout will either be the
// next item after the last timeout we looked at or nullptr if we have
// exhausted the entire list while looking for the last expired timeout.
{
// Use a nested scope in order to make sure the strong references held while
// iterating are freed after the loop.
// The next timeout to run. This is used to advance the loop, but
// we cannot set it until we've run the current timeout, since
// running the current timeout might remove the immediate next
// timeout.
RefPtr<Timeout> next;
for (RefPtr<Timeout> timeout = timeouts.GetFirst(); timeout != nullptr;
timeout = next) {
next = timeout->getNext();
// We should only execute callbacks for the set of expired Timeout
// objects we computed above.
if (timeout->mFiringId != firingId) {
// If the FiringId does not match, but is still valid, then this is
// a Timeout for another RunTimeout() on the call stack (such as in
// the case of nested event loops, for alert() or more likely XHR).
// Just skip it.
if (IsValidFiringId(timeout->mFiringId)) {
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("Skipping Run%s(TimeoutManager=%p, timeout=%p) since "
"firingId %d is valid (processing firingId %d)"
#ifdef DEBUG
" - FiringIndex %" PRId64 " (mLastFiringIndex %" PRId64 ")"
#endif
,
timeout->mIsInterval ? "Interval" : "Timeout", this,
timeout.get(), timeout->mFiringId, firingId
#ifdef DEBUG
,
timeout->mFiringIndex, mFiringIndex
#endif
));
#ifdef DEBUG
// The old FiringIndex assumed no recursion; recursion can cause
// other timers to get fired "in the middle" of a sequence we've
// already assigned firingindexes to. Since we're not going to
// run this timeout now, remove any FiringIndex that was already
// set.
// Since all timers that have FiringIndexes set *must* be ready
// to run and have valid FiringIds, all of them will be 'skipped'
// and reset if we recurse - we don't have to look through the
// list past where we'll stop on the first InvalidFiringId.
timeout->mFiringIndex = -1;
#endif
continue;
}
// If, however, the FiringId is invalid then we have reached Timeout
// objects beyond the list we calculated above. This can happen
// if the Timeout just beyond our last expired Timeout is cancelled
// by one of the callbacks we've just executed. In this case we
// should just stop iterating. We're done.
else {
break;
}
}
MOZ_ASSERT_IF(mWindow.IsFrozen(), mWindow.IsSuspended());
if (mWindow.IsSuspended()) {
break;
}
// The timeout is on the list to run at this depth, go ahead and
// process it.
// Record the first time we try to fire a timeout, and ensure that
// all actual firings occur in that order. This ensures that we
// retain compliance with the spec language
// (https://html.spec.whatwg.org/#dom-settimeout) specifically items
// 15 ("If method context is a Window object, wait until the Document
// associated with method context has been fully active for a further
// timeout milliseconds (not necessarily consecutively)") and item 16
// ("Wait until any invocations of this algorithm that had the same
// method context, that started before this one, and whose timeout is
// equal to or less than this one's, have completed.").
#ifdef DEBUG
if (timeout->mFiringIndex == -1) {
timeout->mFiringIndex = mFiringIndex++;
}
#endif
if (mIsLoading && !aProcessIdle) {
// Any timeouts that would fire during a load will be deferred
// until the load event occurs, but if there's an idle time,
// they'll be run before the load event.
timeout->remove();
// MOZ_RELEASE_ASSERT(timeout->When() <= (TimeStamp::Now()));
mIdleTimeouts.InsertBack(timeout);
if (MOZ_LOG_TEST(gTimeoutLog, LogLevel::Debug)) {
uint32_t num = 0;
for (Timeout* t = mIdleTimeouts.GetFirst(); t != nullptr;
t = t->getNext()) {
num++;
}
MOZ_LOG(
gTimeoutLog, LogLevel::Debug,
("Deferring Run%s(TimeoutManager=%p, timeout=%p (%gms in the "
"past)) (%u deferred)",
timeout->mIsInterval ? "Interval" : "Timeout", this,
timeout.get(), (now - timeout->When()).ToMilliseconds(), num));
}
MOZ_ALWAYS_SUCCEEDS(mIdleExecutor->MaybeSchedule(now, TimeDuration()));
} else {
// Get the script context (a strong ref to prevent it going away)
// for this timeout and ensure the script language is enabled.
nsCOMPtr<nsIScriptContext> scx = mWindow.GetContextInternal();
if (!scx) {
// No context means this window was closed or never properly
// initialized for this language. This timer will never fire
// so just remove it.
timeout->remove();
continue;
}
#ifdef DEBUG
if (timeout->mFiringIndex <= mLastFiringIndex) {
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("Incorrect firing index for Run%s(TimeoutManager=%p, "
"timeout=%p) with "
"firingId %d - FiringIndex %" PRId64
" (mLastFiringIndex %" PRId64 ")",
timeout->mIsInterval ? "Interval" : "Timeout", this,
timeout.get(), timeout->mFiringId, timeout->mFiringIndex,
mFiringIndex));
}
MOZ_ASSERT(timeout->mFiringIndex > mLastFiringIndex);
mLastFiringIndex = timeout->mFiringIndex;
#endif
// This timeout is good to run.
Telemetry::Accumulate(Telemetry::PENDING_CRITICAL_INPUT_WHEN_TIMEOUT,
GetNumPendingInputs());
bool timeout_was_cleared = window->RunTimeoutHandler(timeout, scx);
#if MOZ_GECKO_PROFILER
if (profiler_can_accept_markers()) {
TimeDuration elapsed = now - timeout->SubmitTime();
TimeDuration target = timeout->When() - timeout->SubmitTime();
TimeDuration delta = now - timeout->When();
TimeDuration runtime = TimeStamp::Now() - now;
nsPrintfCString marker(
"%sset%s() for %dms (original target time was %dms (%dms "
"delta)); runtime = %dms",
aProcessIdle ? "Deferred " : "",
timeout->mIsInterval ? "Interval" : "Timeout",
int(elapsed.ToMilliseconds()), int(target.ToMilliseconds()),
int(delta.ToMilliseconds()), int(runtime.ToMilliseconds()));
// don't have end before start...
PROFILER_ADD_MARKER_WITH_PAYLOAD(
"setTimeout", DOM, TextMarkerPayload,
(marker, delta.ToMilliseconds() >= 0 ? timeout->When() : now, now,
Some(mWindow.WindowID())));
}
#endif
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("Run%s(TimeoutManager=%p, timeout=%p) returned %d\n",
timeout->mIsInterval ? "Interval" : "Timeout", this,
timeout.get(), !!timeout_was_cleared));
if (timeout_was_cleared) {
// Make sure we're not holding any Timeout objects alive.
next = nullptr;
// Since ClearAllTimeouts() was called the lists should be empty.
MOZ_DIAGNOSTIC_ASSERT(!HasTimeouts());
return;
}
// If we need to reschedule a setInterval() the delay should be
// calculated based on when its callback started to execute. So
// save off the last time before updating our "now" timestamp to
// account for its callback execution time.
TimeStamp lastCallbackTime = now;
now = TimeStamp::Now();
// If we have a regular interval timer, we re-schedule the
// timeout, accounting for clock drift.
bool needsReinsertion =
RescheduleTimeout(timeout, lastCallbackTime, now);
// Running a timeout can cause another timeout to be deleted, so
// we need to reset the pointer to the following timeout.
next = timeout->getNext();
timeout->remove();
if (needsReinsertion) {
// Insert interval timeout onto the corresponding list sorted in
// deadline order. AddRefs timeout.
// Always re-insert into the normal time queue!
mTimeouts.Insert(timeout, mWindow.IsFrozen()
? Timeouts::SortBy::TimeRemaining
: Timeouts::SortBy::TimeWhen);
}
}
// Check to see if we have run out of time to execute timeout handlers.
// If we've exceeded our time budget then terminate the loop immediately.
TimeDuration elapsed = now - start;
if (elapsed >= totalTimeLimit) {
// We ran out of time. Make sure to schedule the executor to
// run immediately for the next timer, if it exists. Its possible,
// however, that the last timeout handler suspended the window. If
// that happened then we must skip this step.
if (!mWindow.IsSuspended()) {
if (next) {
if (aProcessIdle) {
// We don't want to update timing budget for idle queue firings,
// and all timeouts in the IdleTimeouts list have hit their
// deadlines, and so should run as soon as possible.
// Shouldn't need cancelling since it never waits
MOZ_ALWAYS_SUCCEEDS(
mIdleExecutor->MaybeSchedule(next->When(), TimeDuration()));
} else {
// If we ran out of execution budget we need to force a
// reschedule. By cancelling the executor we will not run
// immediately, but instead reschedule to the minimum
// scheduling delay.
if (mExecutionBudget < TimeDuration()) {
mExecutor->Cancel();
}
MOZ_ALWAYS_SUCCEEDS(MaybeSchedule(next->When(), now));
}
}
}
break;
}
}
}
}
bool TimeoutManager::RescheduleTimeout(Timeout* aTimeout,
const TimeStamp& aLastCallbackTime,
const TimeStamp& aCurrentNow) {
MOZ_DIAGNOSTIC_ASSERT(aLastCallbackTime <= aCurrentNow);
if (!aTimeout->mIsInterval) {
return false;
}
// Automatically increase the nesting level when a setInterval()
// is rescheduled just as if it was using a chained setTimeout().
if (aTimeout->mNestingLevel < DOM_CLAMP_TIMEOUT_NESTING_LEVEL) {
aTimeout->mNestingLevel += 1;
}
// Compute time to next timeout for interval timer.
// Make sure nextInterval is at least CalculateDelay().
TimeDuration nextInterval = CalculateDelay(aTimeout);
TimeStamp firingTime = aLastCallbackTime + nextInterval;
TimeDuration delay = firingTime - aCurrentNow;
#ifdef DEBUG
aTimeout->mFiringIndex = -1;
#endif
// And make sure delay is nonnegative; that might happen if the timer
// thread is firing our timers somewhat early or if they're taking a long
// time to run the callback.
if (delay < TimeDuration(0)) {
delay = TimeDuration(0);
}
aTimeout->SetWhenOrTimeRemaining(aCurrentNow, delay);
if (mWindow.IsSuspended()) {
return true;
}
nsresult rv = MaybeSchedule(aTimeout->When(), aCurrentNow);
NS_ENSURE_SUCCESS(rv, false);
return true;
}
void TimeoutManager::ClearAllTimeouts() {
bool seenRunningTimeout = false;
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("ClearAllTimeouts(TimeoutManager=%p)\n", this));
if (mThrottleTimeoutsTimer) {
mThrottleTimeoutsTimer->Cancel();
mThrottleTimeoutsTimer = nullptr;
}
mExecutor->Cancel();
mIdleExecutor->Cancel();
ForEachUnorderedTimeout([&](Timeout* aTimeout) {
/* If RunTimeout() is higher up on the stack for this
window, e.g. as a result of document.write from a timeout,
then we need to reset the list insertion point for
newly-created timeouts in case the user adds a timeout,
before we pop the stack back to RunTimeout. */
if (mRunningTimeout == aTimeout) {
seenRunningTimeout = true;
}
// Set timeout->mCleared to true to indicate that the timeout was
// cleared and taken out of the list of timeouts
aTimeout->mCleared = true;
});
// Clear out our lists
mTimeouts.Clear();
mIdleTimeouts.Clear();
}
void TimeoutManager::Timeouts::Insert(Timeout* aTimeout, SortBy aSortBy) {
// Start at mLastTimeout and go backwards. Stop if we see a Timeout with a
// valid FiringId since those timers are currently being processed by
// RunTimeout. This optimizes for the common case of insertion at the end.
Timeout* prevSibling;
for (prevSibling = GetLast();
prevSibling &&
// This condition needs to match the one in SetTimeoutOrInterval that
// determines whether to set When() or TimeRemaining().
(aSortBy == SortBy::TimeRemaining
? prevSibling->TimeRemaining() > aTimeout->TimeRemaining()
: prevSibling->When() > aTimeout->When()) &&
// Check the firing ID last since it will evaluate true in the vast
// majority of cases.
mManager.IsInvalidFiringId(prevSibling->mFiringId);
prevSibling = prevSibling->getPrevious()) {
/* Do nothing; just searching */
}
// Now link in aTimeout after prevSibling.
if (prevSibling) {
aTimeout->SetTimeoutContainer(mTimeouts);
prevSibling->setNext(aTimeout);
} else {
InsertFront(aTimeout);
}
aTimeout->mFiringId = InvalidFiringId;
}
Timeout* TimeoutManager::BeginRunningTimeout(Timeout* aTimeout) {
Timeout* currentTimeout = mRunningTimeout;
mRunningTimeout = aTimeout;
++gRunningTimeoutDepth;
RecordExecution(currentTimeout, aTimeout);
return currentTimeout;
}
void TimeoutManager::EndRunningTimeout(Timeout* aTimeout) {
--gRunningTimeoutDepth;
RecordExecution(mRunningTimeout, aTimeout);
mRunningTimeout = aTimeout;
}
void TimeoutManager::UnmarkGrayTimers() {
ForEachUnorderedTimeout([](Timeout* aTimeout) {
if (aTimeout->mScriptHandler) {
aTimeout->mScriptHandler->MarkForCC();
}
});
}
void TimeoutManager::Suspend() {
MOZ_LOG(gTimeoutLog, LogLevel::Debug, ("Suspend(TimeoutManager=%p)\n", this));
if (mThrottleTimeoutsTimer) {
mThrottleTimeoutsTimer->Cancel();
mThrottleTimeoutsTimer = nullptr;
}
mExecutor->Cancel();
mIdleExecutor->Cancel();
}
void TimeoutManager::Resume() {
MOZ_LOG(gTimeoutLog, LogLevel::Debug, ("Resume(TimeoutManager=%p)\n", this));
// When Suspend() has been called after IsDocumentLoaded(), but the
// throttle tracking timer never managed to fire, start the timer
// again.
if (mWindow.IsDocumentLoaded() && !mThrottleTimeouts) {
MaybeStartThrottleTimeout();
}
Timeout* nextTimeout = mTimeouts.GetFirst();
if (nextTimeout) {
MOZ_ALWAYS_SUCCEEDS(MaybeSchedule(nextTimeout->When()));
}
nextTimeout = mIdleTimeouts.GetFirst();
if (nextTimeout) {
MOZ_ALWAYS_SUCCEEDS(
mIdleExecutor->MaybeSchedule(nextTimeout->When(), TimeDuration()));
}
}
void TimeoutManager::Freeze() {
MOZ_LOG(gTimeoutLog, LogLevel::Debug, ("Freeze(TimeoutManager=%p)\n", this));
TimeStamp now = TimeStamp::Now();
ForEachUnorderedTimeout([&](Timeout* aTimeout) {
// Save the current remaining time for this timeout. We will
// re-apply it when the window is Thaw()'d. This effectively
// shifts timers to the right as if time does not pass while
// the window is frozen.
TimeDuration delta(0);
if (aTimeout->When() > now) {
delta = aTimeout->When() - now;
}
aTimeout->SetWhenOrTimeRemaining(now, delta);
MOZ_DIAGNOSTIC_ASSERT(aTimeout->TimeRemaining() == delta);
});
}
void TimeoutManager::Thaw() {
MOZ_LOG(gTimeoutLog, LogLevel::Debug, ("Thaw(TimeoutManager=%p)\n", this));
TimeStamp now = TimeStamp::Now();
ForEachUnorderedTimeout([&](Timeout* aTimeout) {
// Set When() back to the time when the timer is supposed to fire.
aTimeout->SetWhenOrTimeRemaining(now, aTimeout->TimeRemaining());
MOZ_DIAGNOSTIC_ASSERT(!aTimeout->When().IsNull());
});
}
void TimeoutManager::UpdateBackgroundState() {
mExecutionBudget = GetMaxBudget(mWindow.IsBackgroundInternal());
// When the window moves to the background or foreground we should
// reschedule the TimeoutExecutor in case the MinSchedulingDelay()
// changed. Only do this if the window is not suspended and we
// actually have a timeout.
if (!mWindow.IsSuspended()) {
Timeout* nextTimeout = mTimeouts.GetFirst();
if (nextTimeout) {
mExecutor->Cancel();
MOZ_ALWAYS_SUCCEEDS(MaybeSchedule(nextTimeout->When()));
}
// the Idle queue should all be past their firing time, so there we just
// need to restart the queue
// XXX May not be needed if we don't stop the idle queue, as
// MinSchedulingDelay isn't relevant here
nextTimeout = mIdleTimeouts.GetFirst();
if (nextTimeout) {
mIdleExecutor->Cancel();
MOZ_ALWAYS_SUCCEEDS(
mIdleExecutor->MaybeSchedule(nextTimeout->When(), TimeDuration()));
}
}
}
namespace {
class ThrottleTimeoutsCallback final : public nsITimerCallback,
public nsINamed {
public:
explicit ThrottleTimeoutsCallback(nsGlobalWindowInner* aWindow)
: mWindow(aWindow) {}
NS_DECL_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
NS_IMETHOD GetName(nsACString& aName) override {
aName.AssignLiteral("ThrottleTimeoutsCallback");
return NS_OK;
}
private:
~ThrottleTimeoutsCallback() = default;
private:
// The strong reference here keeps the Window and hence the TimeoutManager
// object itself alive.
RefPtr<nsGlobalWindowInner> mWindow;
};
NS_IMPL_ISUPPORTS(ThrottleTimeoutsCallback, nsITimerCallback, nsINamed)
NS_IMETHODIMP
ThrottleTimeoutsCallback::Notify(nsITimer* aTimer) {
mWindow->TimeoutManager().StartThrottlingTimeouts();
mWindow = nullptr;
return NS_OK;
}
} // namespace
bool TimeoutManager::BudgetThrottlingEnabled(bool aIsBackground) const {
// A window can be throttled using budget if
// * It isn't active
// * If it isn't using WebRTC
// * If it hasn't got open WebSockets
// * If it hasn't got active IndexedDB databases
// Note that we allow both foreground and background to be
// considered for budget throttling. What determines if they are if
// budget throttling is enabled is the max budget.
if ((aIsBackground
? StaticPrefs::dom_timeout_background_throttling_max_budget()
: StaticPrefs::dom_timeout_foreground_throttling_max_budget()) < 0) {
return false;
}
if (!mBudgetThrottleTimeouts || IsActive()) {
return false;
}
// Check if there are any active IndexedDB databases
if (mWindow.HasActiveIndexedDBDatabases()) {
return false;
}
// Check if we have active PeerConnection
if (mWindow.HasActivePeerConnections()) {
return false;
}
if (mWindow.HasOpenWebSockets()) {
return false;
}
return true;
}
void TimeoutManager::StartThrottlingTimeouts() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(mThrottleTimeoutsTimer);
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("TimeoutManager %p started to throttle tracking timeouts\n", this));
MOZ_DIAGNOSTIC_ASSERT(!mThrottleTimeouts);
mThrottleTimeouts = true;
mThrottleTrackingTimeouts = true;
mBudgetThrottleTimeouts =
StaticPrefs::dom_timeout_enable_budget_timer_throttling();
mThrottleTimeoutsTimer = nullptr;
}
void TimeoutManager::OnDocumentLoaded() {
// The load event may be firing again if we're coming back to the page by
// navigating through the session history, so we need to ensure to only call
// this when mThrottleTimeouts hasn't been set yet.
if (!mThrottleTimeouts) {
MaybeStartThrottleTimeout();
}
}
void TimeoutManager::MaybeStartThrottleTimeout() {
if (StaticPrefs::dom_timeout_throttling_delay() <= 0 || mWindow.IsDying() ||
mWindow.IsSuspended()) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(!mThrottleTimeouts);
MOZ_LOG(gTimeoutLog, LogLevel::Debug,
("TimeoutManager %p delaying tracking timeout throttling by %dms\n",
this, StaticPrefs::dom_timeout_throttling_delay()));
nsCOMPtr<nsITimerCallback> callback = new ThrottleTimeoutsCallback(&mWindow);
NS_NewTimerWithCallback(getter_AddRefs(mThrottleTimeoutsTimer), callback,
StaticPrefs::dom_timeout_throttling_delay(),
nsITimer::TYPE_ONE_SHOT, EventTarget());
}
void TimeoutManager::BeginSyncOperation() {
// If we're beginning a sync operation, the currently running
// timeout will be put on hold. To not get into an inconsistent
// state, where the currently running timeout appears to take time
// equivalent to the period of us spinning up a new event loop,
// record what we have and stop recording until we reach
// EndSyncOperation.
RecordExecution(mRunningTimeout, nullptr);
}
void TimeoutManager::EndSyncOperation() {
// If we're running a timeout, restart the measurement from here.
RecordExecution(nullptr, mRunningTimeout);
}
nsIEventTarget* TimeoutManager::EventTarget() {
return mWindow.GetBrowsingContextGroup()->GetTimerEventQueue();
}
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