Qthread,adding function to qthread

Question

I have a class like that

class Class1 : public QObject
{
    Q_OBJECT
    void a();
    void b();
    ...........

void Class1:a()
{
    for(int i=0;i<10;i++)
        b();//I want here to make parallel 

           //and wait here all threads are done


}

how can I use qhthread here,I ve looked to tutorials they all are just for classes not for a function?

Answer 1

If you need to run a function on a separate thread, you can use QtConcurrent like this:

QtConcurrent::run(this, &Class1::b);

Edit: You can use QFutureSynchronizer to wait for all threads, don't forget to allocate all threads using QThreadPool::globalInstance()->setMaxThreadCount().

Edit 2: You can use synchronizer.futures() to acess all threads return values.

Example:

QThreadPool::globalInstance()->setMaxThreadCount(10);
QFutureSynchronizer<int> synchronizer;
for(int i = 1; i <= 10; i++)
    synchronizer.addFuture(QtConcurrent::run(this, &Class1::b));
synchronizer.waitForFinished();
foreach(QFuture<int> thread, synchronizer.futures())
    qDebug() << thread.result(); //Get the return value of each thread.