How to sleep in a worker thread in Qt? - c++

Question

I am creating an example to understand threads in Qt and want my worker thread to sleep for 1 second between each increment so I can see the debug output. But the sleep makes my main GUI thread non-responsive.
Here is my slot functoin in OddCounter class.
void OddCounter::count()
{
for (int i = 0; i < 10; i++)
{
counter += 2;
qDebug() << counter;
QThread::sleep( 1 );
}
}
My mainwindow class which calls this thread is:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
oddCounter = new OddCounter;
connect(this, SIGNAL(startOddCounter()), evenCounter, SLOT(count()), Qt::QueuedConnection );
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
OddCounter oddCounter;
oddCounter.moveToThread( &thread );
thread.start();
emit startOddCounter();
}
The problem is when I press the button, the counter works and displays the next increment after each second passed but the mainwindow is non responsive all this time! This is not right! I want my mainwindow to be responsive and only the thread should sleep. How do I do that?

Answer 1

You have an error in your code: you are creating another OddCounter which you move to the different thread but your original oddCounter to which the signal is connected still lives in the main thread. You should change your code to this:
void MainWindow::on_pushButton_clicked()
{
oddCounter->moveToThread( &thread );
thread.start();
emit startOddCounter();
}