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renderthread.h Example File
threads/mandelbrot/renderthread.h

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 #ifndef RENDERTHREAD_H
 #define RENDERTHREAD_H

 #include <QMutex>
 #include <QSize>
 #include <QThread>
 #include <QWaitCondition>

 class QImage;

 class RenderThread : public QThread
 {
     Q_OBJECT

 public:
     RenderThread(QObject *parent = 0);
     ~RenderThread();

     void render(double centerX, double centerY, double scaleFactor,
                 QSize resultSize);

 signals:
     void renderedImage(const QImage &image, double scaleFactor);

 protected:
     void run();

 private:
     uint rgbFromWaveLength(double wave);

     QMutex mutex;
     QWaitCondition condition;
     double centerX;
     double centerY;
     double scaleFactor;
     QSize resultSize;
     bool restart;
     bool abort;

     enum { ColormapSize = 512 };
     uint colormap[ColormapSize];
 };

 #endif


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Qt 4.3.5