QGLWidget and QThread, how to render in separate thread?

[DIMEDROLL]

I've found a nice tutorial on multithreaded OpenGL rendering on QGLWidget:
http://doc.trolltech.com/qq/qq06-gli...glapplications
But I have some questions about it:
1.

class GLThread : public QThread

class GLThread : public QThread

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Is it safe to modify GLThread's members:

bool doRendering;
bool doResize;
int w;
...

bool doRendering;
bool doResize;
int w;
...

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when GLThread thread is running and reads each variable every iteration?
I'm talking about

void GLWidget::resizeEvent(QResizeEvent *evt)
{      /*glt is GLThread's object*/
	glt.resizeViewport(evt->size());
}

void GLWidget::resizeEvent(QResizeEvent *evt)
{      /*glt is GLThread's object*/
	glt.resizeViewport(evt->size());
}

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2. Is it safe to modify more complex GLThread's members when GLThread thread is running? E.g.

class MyComplexGLThreadMemberClass {
	int a;
	double b;
	vector<int> c;
};

class MyComplexGLThreadMemberClass {
	int a;
	double b;
	vector<int> c;
};

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3.

class GLWidget : public QGLWidget

class GLWidget : public QGLWidget

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Is it safe to call GLWidget's methods from a running GLThread thread?

void GLThread::run()
{
	glw->makeCurrent();
	while (doRendering) {
			// Rendering code goes here
		glw->swapBuffers();
	}
}

void GLThread::run()
{
	glw->makeCurrent();
	while (doRendering) {
			// Rendering code goes here
		glw->swapBuffers();
	}
}

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Here is my source code for Qt4.7 and exe file built with Qt4.7, you'll need Qt dlls to run it.
TestGl.zip
TestGl_exe.zip