How to tell QThread to wait until work is done ,and then finish?

Question

I have a simple application that uses one worker thread. This worker thread is started and initializes DownloadManager, which is responsible for downloading files from the net.

Answer 1

You can use QThread::exec() call to run your thread in the event loop. The thread will run it until you tell your thread to exit by calling QThread::exit(). So some sample code can look like this:

void DownloadWorker::run()
 {
    DownloadManager* pDownloadManager = new DownloadManager(this);
    connect(pDownloadManager, SIGNAL(finished()), SLOT(exit()));
    connect(pDownloadManager, SIGNAL(error()), SLOT(exit()));
    pDownloadManager->download();
    exec();
 }

That would guarantee you that your thread won't quit until the "finished()" signal of your DownloadManager is issued.

Note: Here I put an example of how to solve your problem but I don't know your whole app code. That means there is not guarantee this code is thread safe and consistent. You need to take care of the mutexes and all the correct synchronization yourself. Be very careful ! Working with such a "low level" thread API requites good understanding of multithereading.

Hope that helps