How to wait till all the Qt concurent threads finished with exec() and then continue

I am running 5 threads as below

Code:

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void dialog::myfunction()
{
   for(int i=0; i< 5 ; i++
   {
      QtConcurrent::run()
    }
 
    QEventLoop l_event;
    i_event.exec()
 
   qDebu() <<"All threads finished";
 
}

---

I want to wait here till all the threads get finished.

Code:

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void QFutureSynchronizer::waitForFinished () //is hanging my main GUI.

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So I want to use some thing like this QEventLoop::exec(); But qDebug() is not getting called at all, Is there a way to reach qDebug() once all the threads finished.
For some other reason I can not use QFutureWatcher().

Any suggestions ?

Quote:

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Originally Posted by prasad_N

I am running 5 threads as below

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No, that schedules 5 tasks on the global thread pool.
Whether that gets executed by 5 threads or any other number depends on that thread pool.

Quote:

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Originally Posted by prasad_N

So I want to use some thing like this QEventLoop::exec(); But qDebug() is not getting called at all

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There seems to be nothing that quits the even loop.

Quote:

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Originally Posted by prasad_N

For some other reason I can not use QFutureWatcher().

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Why not? QtConcurrent::run() returns a QFuture

Cheers,
_

I did some thing like this.

Code:

---

void dialog::myfunction()
{
   for(int i=0; i< 5 ; i++
   {
      QtConcurrent::run()
    }
 
    m_eventLoop= new QEventLoop();   //QPointer<QEventLoop> m_eventLoop;  QPointer automatically make a pointer NULL when it gets deleted  
    m_eventLoop->exec(); 
 
   //do things after threads finished
 
    qDebug() <<"All threads finished";
 
}
 
 
void dialog::finishedAllThread()
{
    if(m_eventLoop){
        m_eventLoop->quit();
        m_eventLoop->deleteLater();
    }
}

---

//I use QFutureWatcher, finished() signal to get to know when all the threads finished
//I can use QFutureWatcher actually, But I should not do things in slot instead I should do things in myfunction() only.

Glad the read that you have solved the problem :)

Cheers,
_