How can I implent an thread manager?

I do something in MyThread, the main run() is infinite loop until stop() is called(canRun change to false)
ThreadManager is a class which manger threads. When sometime calls Delete(MyThread * thr), "thr" will be pushed in a queue, and the main run() of ThreadManager get a MyThread pointer from the queue and delete the thread.

I want to block the thread of ThreadManager until "thr" can be deleted, my problem is I don't know when "thr" is terminated.

This is my code here.
Thanks for any suggestions.

Code:

---

class MyThread : public QThread
{
public:
    MyThread() { canRun = true; }
 
    void run()
    {
        while(canRun)
        {
            msleep(50);
            /* do something */
        }
        exec();
    }
    void stop() { canRun = false; }
private:
    bool canRun;
};
 
 
class ThreadManager : public QThread
{
public:
    void run()
    {
        MyThread * thr;
        queue.clear();
        while(true)
        {
            msleep(50);
            while(!queue.isEmpty())
            {
                thr = queue.dequeue();
                thr->stop();
                /* I want to block this thread until
                 * "thr" terminated(can be deleted) */
                 delete thr;
            }
        }
 
    }
 
    MyThread * New() { return (new MyThread); }
    void Delete(MyThread * thr) { queue.push_back(thr); }
 
private:
    QQueue<MyThread*> queue;
};

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The following line should do (using QThread::wait):

Code:

---

thr->wait();

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You should maybe also have a look at the QThreadPool class and the Mandelbrot example that comes with Qt.