ofThead blocking does not work

gistfile1.c++

// simple thread class
class MyCustomThread : public ofThread {
protected:
	virtual void threadedFunction() {
		while(true) {
			cout <<  "My own custom thread!" << endl;
			ofSleepMillis(3000);
		}
	}
};


// using the thread
void testApp::setup(){
	// creates a blocking thread (verbose)
	cout << "Start: blocking thread\n";	
	my_thread.startThread(true, true);
	cout << "Stopped: blocking thread\n";
}