Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/C/Firefox/xpcom/threads/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 8 kB

Quelle IdleTaskRunner.cpp Sprache: C

/* -*- 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 "IdleTaskRunner.h"
#include "mozilla/TaskController.h"
#include "nsRefreshDriver.h"

namespace mozilla {

already_AddRefed<IdleTaskRunner> IdleTaskRunner::Create(
    const CallbackType& aCallback, const char* aRunnableName,
    TimeDuration aStartDelay, TimeDuration aMaxDelay,
    TimeDuration aMinimumUsefulBudget, bool aRepeating,
    const MayStopProcessingCallbackType& aMayStopProcessing,
    const RequestInterruptCallbackType& aRequestInterrupt) {
  if (aMayStopProcessing && aMayStopProcessing()) {
    return nullptr;
  }

  RefPtr<IdleTaskRunner> runner = new IdleTaskRunner(
      aCallback, aRunnableName, aStartDelay, aMaxDelay, aMinimumUsefulBudget,
      aRepeating, aMayStopProcessing, aRequestInterrupt);
  runner->Schedule(false);  // Initial scheduling shouldn't use idle dispatch.
  return runner.forget();
}

class IdleTaskRunnerTask : public Task {
public:
  explicit IdleTaskRunnerTask(IdleTaskRunner* aRunner)
      : Task(Kind::MainThreadOnly, EventQueuePriority::Idle),
        mRunner(aRunner),
        mRequestInterrupt(aRunner->mRequestInterrupt) {
    SetManager(TaskController::Get()->GetIdleTaskManager());
  }

  TaskResult Run() override {
    if (mRunner) {
      // IdleTaskRunner::Run can actually trigger the destruction of the
      // IdleTaskRunner. Make sure it doesn't get destroyed before the method
      // finished.
      RefPtr<IdleTaskRunner> runner(mRunner);
      runner->Run();
    }
    return TaskResult::Complete;
  }

  void SetIdleDeadline(TimeStamp aDeadline) override {
    if (mRunner) {
      mRunner->SetIdleDeadline(aDeadline);
    }
  }

  void Cancel() { mRunner = nullptr; }

  bool GetName(nsACString& aName) override {
    if (mRunner) {
      aName.Assign(mRunner->GetName());
    } else {
      aName.Assign("ExpiredIdleTaskRunner");
    }
    return true;
  }

  void RequestInterrupt(uint32_t aInterruptPriority) override {
    if (mRequestInterrupt) {
      mRequestInterrupt(aInterruptPriority);
    }
  }

private:
  IdleTaskRunner* mRunner;

  // Copied here and invoked even if there is no mRunner currently, to avoid
  // race conditions checking mRunner when an interrupt is requested.
  IdleTaskRunner::RequestInterruptCallbackType mRequestInterrupt;
};

IdleTaskRunner::IdleTaskRunner(
    const CallbackType& aCallback, const char* aRunnableName,
    TimeDuration aStartDelay, TimeDuration aMaxDelay,
    TimeDuration aMinimumUsefulBudget, bool aRepeating,
    const MayStopProcessingCallbackType& aMayStopProcessing,
    const RequestInterruptCallbackType& aRequestInterrupt)
    : mCallback(aCallback),
      mStartTime(TimeStamp::Now() + aStartDelay),
      mMaxDelay(aMaxDelay),
      mMinimumUsefulBudget(aMinimumUsefulBudget),
      mRepeating(aRepeating),
      mTimerActive(false),
      mMayStopProcessing(aMayStopProcessing),
      mRequestInterrupt(aRequestInterrupt),
      mName(aRunnableName) {}

void IdleTaskRunner::Run() {
  if (!mCallback) {
    return;
  }

  // Deadline is null when called from timer or RunNextCollectorTimer rather
  // than during idle time.
  TimeStamp now = TimeStamp::Now();

  // Note that if called from RunNextCollectorTimer, we may not have reached
  // mStartTime yet. Pretend we are overdue for idle time.
  bool overdueForIdle = mDeadline.IsNull();
  bool didRun = false;
  bool allowIdleDispatch = false;

  if (mTask) {
    // If we find ourselves here we should usually be running from this task,
    // but there are exceptions. In any case we're doing the work now and don't
    // need our task going forward unless we're re-scheduled.
    nsRefreshDriver::CancelIdleTask(mTask);
    // Extra safety, make sure a task can never have a dangling ptr.
    mTask->Cancel();
    mTask = nullptr;
  }

  if (overdueForIdle || ((now + mMinimumUsefulBudget) < mDeadline)) {
    CancelTimer();
    didRun = mCallback(mDeadline);
    // If we didn't do meaningful work, don't schedule using immediate
    // idle dispatch, since that could lead to a loop until the idle
    // period ends.
    allowIdleDispatch = didRun;
  } else if (now >= mDeadline) {
    allowIdleDispatch = true;
  }

  if (mCallback && (mRepeating || !didRun)) {
    Schedule(allowIdleDispatch);
  } else {
    mCallback = nullptr;
  }
}

static void TimedOut(nsITimer* aTimer, void* aClosure) {
  RefPtr<IdleTaskRunner> runner = static_cast<IdleTaskRunner*>(aClosure);
  runner->Run();
}

void IdleTaskRunner::SetIdleDeadline(mozilla::TimeStamp aDeadline) {
  mDeadline = aDeadline;
}

void IdleTaskRunner::SetMinimumUsefulBudget(int64_t aMinimumUsefulBudget) {
  mMinimumUsefulBudget = TimeDuration::FromMilliseconds(aMinimumUsefulBudget);
}

void IdleTaskRunner::SetTimer(TimeDuration aDelay, nsIEventTarget* aTarget) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aTarget->IsOnCurrentThread());
  // aTarget is always the main thread event target provided from
  // NS_DispatchToCurrentThreadQueue(). We ignore aTarget here to ensure that
  // CollectorRunner always run specifically the main thread.
  SetTimerInternal(aDelay);
}

void IdleTaskRunner::Cancel() {
  CancelTimer();
  mTimer = nullptr;
  mScheduleTimer = nullptr;
  mCallback = nullptr;
}

static void ScheduleTimedOut(nsITimer* aTimer, void* aClosure) {
  RefPtr<IdleTaskRunner> runnable = static_cast<IdleTaskRunner*>(aClosure);
  runnable->Schedule(true);
}

void IdleTaskRunner::Schedule(bool aAllowIdleDispatch) {
  if (!mCallback) {
    return;
  }

  if (mMayStopProcessing && mMayStopProcessing()) {
    Cancel();
    return;
  }

  mDeadline = TimeStamp();

  TimeStamp now = TimeStamp::Now();

  if (aAllowIdleDispatch) {
    SetTimerInternal(mMaxDelay);
    if (!mTask) {
      mTask = new IdleTaskRunnerTask(this);
      RefPtr<Task> task(mTask);
      TaskController::Get()->AddTask(task.forget());
    }
    return;
  }

  bool useRefreshDriver = false;
  if (now >= mStartTime) {
    // Detect whether the refresh driver is ticking by checking if
    // GetIdleDeadlineHint returns its input parameter.
    useRefreshDriver =
        (nsRefreshDriver::GetIdleDeadlineHint(
             now, nsRefreshDriver::IdleCheck::OnlyThisProcessRefreshDriver) !=
         now);
  }

  if (useRefreshDriver) {
    if (!mTask) {
      // If a task was already scheduled, no point rescheduling.
      mTask = new IdleTaskRunnerTask(this);
      // RefreshDriver is ticking, let it schedule the idle dispatch.
      nsRefreshDriver::DispatchIdleTaskAfterTickUnlessExists(mTask);
    }
    // Ensure we get called at some point, even if RefreshDriver is stopped.
    SetTimerInternal(mMaxDelay);
  } else {
    // RefreshDriver doesn't seem to be running.
    if (!mScheduleTimer) {
      mScheduleTimer = NS_NewTimer();
      if (!mScheduleTimer) {
        return;
      }
    } else {
      mScheduleTimer->Cancel();
    }
    // We weren't allowed to do idle dispatch immediately, do it after a
    // short timeout. (Or wait for our start time if we haven't started yet.)
    uint32_t waitToSchedule = 16; /* ms */
    if (now < mStartTime) {
      // + 1 to round milliseconds up to be sure to wait until after
      // mStartTime.
      waitToSchedule = (mStartTime - now).ToMilliseconds() + 1;
    }
    mScheduleTimer->InitWithNamedFuncCallback(
        ScheduleTimedOut, this, waitToSchedule,
        nsITimer::TYPE_ONE_SHOT_LOW_PRIORITY, mName);
  }
}

IdleTaskRunner::~IdleTaskRunner() { CancelTimer(); }

void IdleTaskRunner::CancelTimer() {
  if (mTask) {
    nsRefreshDriver::CancelIdleTask(mTask);
    mTask->Cancel();
    mTask = nullptr;
  }
  if (mTimer) {
    mTimer->Cancel();
  }
  if (mScheduleTimer) {
    mScheduleTimer->Cancel();
  }
  mTimerActive = false;
}

void IdleTaskRunner::SetTimerInternal(TimeDuration aDelay) {
  if (mTimerActive) {
    return;
  }
  ResetTimer(aDelay);
}

void IdleTaskRunner::ResetTimer(TimeDuration aDelay) {
  mTimerActive = false;

  if (!mTimer) {
    mTimer = NS_NewTimer();
  } else {
    mTimer->Cancel();
  }

  if (mTimer) {
    mTimer->InitWithNamedFuncCallback(TimedOut, this, aDelay.ToMilliseconds(),
                                      nsITimer::TYPE_ONE_SHOT, mName);
    mTimerActive = true;
  }
}

}  // end of namespace mozilla

quality94%

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.