Main Thread isn't getting executed while spanned thread is executing constructor

HI All,
I have a QT widget app, which on bootup creates a new thread(Thread2) while main thread is on welcome screen(Parent window). The Aim of Thread2 is initialize all the subsequent screens which are nothing but multiple window constructors. My welcome screen has a loading gif image which loaded as movie . The problem here is when Thread2 spans, The main thread is becoming unresponsive until thread2 completes. This is making the welcome screen looks hanged as gif image movie is not playing.

Can any one help me how to resolve this problem?

Code:

---

// Gif image 
movie = new QMovie(":/resources/resources/other/loader.gif");
movie->setScaledSize(QSize(ui->gif_label->width(),ui->gif_label->height()));
ui->gif_label->setMovie(movie);
movie->start();
 
//Thread span Process fn
thread2::process()
{
MainMenuScreen = new MainMenu(this);
MainMenuScreen->InitScreens(); // This intScreens fn has all window constructors
}

---

Thanks,
Nagendra.

The GUI must be supported in the main thread. The second thread in this case does not make any sense.
Read about QSplashScreen.