Can not Start multiple Thread

Ketan__Patel__0011

Hello friend currently i am working on parallel processing concepts

i want run my 2 or 3 functions parallelly

when i start Thread Number 1 on my button click event that time Thread one is started but after thread number 1 is started i can't perform any other operation in my application until Thread number 1 process is not finished

My Application GUI Is :

My Code is :

   #include "mainwindow.h"       
   #include "ui_mainwindow.h"
                 
   MainWindow::MainWindow(QWidget *parent) :  QMainWindow(parent),      
       ui(new Ui::MainWindow)       
   {       
   ui->setupUi(this);          
     
  TestingThread_1 = new QThread();      
  connect(TestingThread_1,SIGNAL(started()),this,SLOT(Start_Processing_1()));      
          
  TestingThread_2 = new QThread();       
  connect(TestingThread_2,SIGNAL(started()),this,SLOT(Start_Processing_2()));
                
  TestingThread_3 = new QThread();    
  connect(TestingThread_3,SIGNAL(started()),this,SLOT(Start_Processing_3()));      
   }
                 
   MainWindow::~MainWindow()       
   {       
       delete ui;       
   }       
          
   void MainWindow::Start_Processing_1()       
   {       
       for(i = 0 ; i < 100 ; i++)       
       {       
           ui->label->setText(QString::number(i + 1));       
           QThread::msleep(20);       
           qDebug() << i;       
       }       
   }
                 
   void MainWindow::Start_Processing_2()       
   {       
       for(int i = 0 ; i < 100 ; i++)       
       {       
           ui->label_2->setText(QString::number(i + 1));       
           QThread::msleep(20);       
           qDebug() << i;       
       }       
   }
                 
   void MainWindow::Start_Processing_3()       
   {       
       for(int i = 0 ; i < 100 ; i++)       
       {       
           ui->label_3->setText(QString::number(i + 1));       
           QThread::msleep(20);       
           qDebug() << i;       
       }       
   }
                 
   void MainWindow::on_pushButton_clicked()       
   {       
       TestingThread_1->start();       
   }              
   
   void MainWindow::on_pushButton_2_clicked()       
   {       
       TestingThread_2->start();       
   }              
   
   void MainWindow::on_pushButton_3_clicked()       
   {       
       TestingThread_3->start();       
   }

please friends help me to solve this problem
Thanks in Advance

sierdzio

The methods Start_Processing_1(), Start_Processing_2() and Start_Processing_3() are run in your main thread. Your QThread instances do nothing.

Please read and use the docs, the way QThread works is described in detail there. https://doc.qt.io/qt-5/qthread.html

In short:

either subclass QThread and reimplement run()
or use worker object approach