Performance problem with processEvents() on Mac OSX

[ahmedb]

Dear all,

- I have a SplashScreen form with a progressBar. and another class is doing processing in a large loop.

- the processing is emiting a signal that's connected to a slot in SplashScreen that updates progress-Bar value and calls processEvents()

- the problem is that when the processing loop was greater than 17,000,000 turns, progress takes over one hour in Mac OSX. however, the same loop took around 2 minutes in Windows and Linux.

Splashscreen.h

class SplashScreen : public QWidget
{
Q_OBJECT
 
public:
    SplashScreen(QWidget *parent = 0);
    ~SplashScreen();
 
public slots:
        void progress(qint32) ;
}

class SplashScreen : public QWidget
{
Q_OBJECT

public:
    SplashScreen(QWidget *parent = 0);
    ~SplashScreen();

public slots:
        void progress(qint32) ;
}

To copy to clipboard, switch view to plain text mode 

SplashScreen.cpp

void SplashScreen::progress(qint32 percent)
{
    ui.progressBar->setValue(percent) ;
    qApp->processEvents() ;
}

void SplashScreen::progress(qint32 percent)
{
    ui.progressBar->setValue(percent) ;
    qApp->processEvents() ;
}

To copy to clipboard, switch view to plain text mode 

processing code:

Source code

connect(this, SIGNAL(progress(qint32)), splashScreenObj, SLOT(progress(qint32))) ;
... 
for(int i=0;i<count;++i)
{
	...
	int percent = (int)((i/count) * 100.0f)
	emit progress( percent) ;
}

connect(this, SIGNAL(progress(qint32)), splashScreenObj, SLOT(progress(qint32))) ;
... 
for(int i=0;i<count;++i)
{
	...
	int percent = (int)((i/count) * 100.0f)
	emit progress( percent) ;
}

To copy to clipboard, switch view to plain text mode 

How can I solve that ?

Thanks in advance,

Ahmed Bedier