how to deal with one class(object) with several steps function which need to run in multiple threads.

JohnnyZ

Hi all,

Hope I can make it clearly and someone can help me, thanks in advance.

Now I have a class such as:
class A: QObject{
Q_OBJECT
...
private:
Object data1; //queue
Object data2; //queue

void step1(); //create data1
void step2(); //use data1, create data2
void step3(); //use data2

signals:
...
public slots:
...
}

What I want to do is create a A object and run those 3 steps to make a whole task, and those 3 steps need to be run in its own thread, so need 3 threads at all.

I found that only QThread::create() (Qt 5.10+) can make function run in a thread, but I don't know how to do it in this case.

Can anyone give me some suggestions?

mzimmers

I'm not sure I completely understand, but can you create a public function in A that calls your three step functions, and do something like this:

    a = new A();
    thread = new QThread;
    a->moveToThread(thread);
    thread->start();

You'd define a slot in the A c'tor to invoke the public function mentioned above.

SGaist

Hi and welcome to devnet,

Sounds like you should take a look at the Qt state machine framework to model your situation.

MrShawn

Check out QRunnable and QThreadpool.

Setup a threadpool with 3 threads (or more) and make runnables with your tasks that need to be processed.

JohnnyZ

Many thanks to all of you, @mzimmers @SGaist @MrShawn , I will try things you suggested ASAP.