Нужен рабочий пример того, как использовать QThreadPool

Я хочу использовать MultiThreading WebKit с QThreadPool

Мой код:

webkitrunnable.cpp:

webkitRunnable::webkitRunnable(QUrl inputURL) : url(inputURL)
{
init();
}

void webkitRunnable::run()
{
qDebug() << "run ...";
qDebug() << "webkit runnable --> " << url;

loadPage(url);
}

void webkitRunnable::init()
{
qDebug() << "WebKit--> init webkit";
webView = new QWebView;

connect(webView, SIGNAL(loadFinished(bool)), SLOT(finishLoading(bool)));

manager = new QNetworkAccessManager(this);

manager = webView->page()->networkAccessManager();

webView->page()->setNetworkAccessManager(manager);

connect(manager, SIGNAL(finished(QNetworkReply*)),this, SLOT(replyFinished(QNetworkReply*)));
}

void webkitRunnable::finishLoading(bool)
{
qDebug() << "WebKit--> finish loading";
}

void webkitRunnable::replyFinished(QNetworkReply* Reply)
{
qDebug() << "WebKit--> reply Finished";
}

void webkitRunnable::loadPage(QUrl url)
{
qDebug() << "WebKit--> load Page";
webView->load(url);
webView->setFocus();
}

webkitrunnable.h:

class webkitRunnable : public QObject, public QRunnable
{
Q_OBJECT

public:
webkitRunnable(QUrl inputURL);

void loadPage(QUrl url);

protected:
void run();

signals:

public slots:
void finishLoading(bool);
void replyFinished(QNetworkReply*);

private:
void    init();

QUrl                    url;
QNetworkAccessManager   *manager;
QWebView                *webView;
};

mythread.cpp:

MyThread::MyThread(QObject *parent) :
QObject(parent)
{
threadPool = new QThreadPool(this);
threadPool->setMaxThreadCount(20);

webkit = new webkitRunnable(QUrl("http://www.google.com/"));
}

MyThread::~MyThread()
{
delete threadPool;
}

void MyThread::startMultiThreadLoad(QUrl url)
{
webkit = new webkitRunnable(url);

connect(webkit, SIGNAL(threadFinished(int)), this, SLOT(finished(int)), Qt::QueuedConnection);

for (int i = 0; i < threadPool->maxThreadCount(); i++)
{
threadPool->start(webkit);
qDebug() << "start(active):" << threadPool->activeThreadCount();
}
}

void MyThread::finished(int number)
{
qDebug() << "thread number is: " << number;
qDebug() << "finished(active):" << threadPool->activeThreadCount();
}

mythread.h:

class MyThread : public QObject
{
Q_OBJECT
public:
explicit MyThread(QObject *parent = 0);
~MyThread();
void startMultiThreadLoad(QUrl url);

public slots:
void finished(int);

private:
webkitRunnable* webkit;
QUrl            globalURL;

QThreadPool     *threadPool;
};

Всякий раз, когда webkit->load() выполнено, я получил следующий вывод приложения в Qt Creator:

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QNetworkAccessManager(0x6f1598), parent's thread is QThread(0x65dfd0), current thread is QThread(0x6ccd28)

Как я могу решить это? Кто-нибудь может привести пример?
Спасибо