QueuedCustomType example: use QThread::requestInterruption

Drop the home-made solution with mutex and bool (which could have been
an atomic, but we have had a ready-made solution in QThread for a long
time).

Pick-to: 6.5 6.6
Change-Id: Id213a021f0ae94215afb28ff874fcb597dd1e6f9
Reviewed-by: MohammadHossein Qanbari <mohammad.qanbari@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Mikko Hallamaa <mikko.hallamaa@qt.io>
Reviewed-by: Ed Cooke

examples/corelib/threads/queuedcustomtype/renderthread.cpp

@@ -10,15 +10,10 @@
 RenderThread::RenderThread(QObject *parent)
     : QThread(parent)
 {
-    m_abort = false;
 }
 
 RenderThread::~RenderThread()
 {
-    mutex.lock();
-    m_abort = true;
-    mutex.unlock();
-
     wait();
 }
 
@@ -29,7 +24,6 @@ void RenderThread::processImage(const QImage &image)
         return;
 
     m_image = image;
-    m_abort = false;
     start();
 }
 
@@ -60,17 +54,10 @@ void RenderThread::run()
             const Block block(QRect(x1, y1, x2 - x1 + 1, y2 - y1 + 1),
                         QColor(red/n, green/n, blue/n));
             emit sendBlock(block);
-            if (m_abort)
+            if (isInterruptionRequested())
                 return;
             msleep(10);
         }
     }
 }
 //![processing the image (finish)]
-
-void RenderThread::stopProcess()
-{
-    mutex.lock();
-    m_abort = true;
-    mutex.unlock();
-}

examples/corelib/threads/queuedcustomtype/renderthread.h

@@ -5,7 +5,6 @@
 #define RENDERTHREAD_H
 
 #include <QImage>
-#include <QMutex>
 #include <QThread>
 
 class Block;
@@ -20,7 +19,6 @@ public:
     ~RenderThread();
 
     void processImage(const QImage &image);
-    void stopProcess();
 
 signals:
     void sendBlock(const Block &block);
@@ -29,9 +27,7 @@ protected:
     void run();
 
 private:
-    bool m_abort;
     QImage m_image;
-    QMutex mutex;
 };
 //! [RenderThread class definition]
 

examples/corelib/threads/queuedcustomtype/window.cpp

@@ -29,7 +29,7 @@ Window::Window(QWidget *parent)
     connect(loadButton, &QPushButton::clicked,
             this, QOverload<>::of(&Window::loadImage));
     connect(resetButton, &QPushButton::clicked,
-            thread, &RenderThread::stopProcess);
+            thread, &RenderThread::requestInterruption);
     connect(thread, &RenderThread::finished,
             this, &Window::resetUi);
 //! [set up widgets and connections] //! [connecting signal with custom type]