I see your point now, thanks. Indeed, _http member variable lives in the main thread when I call a.start(). Run method of the "a" instance uses _http once and then exits with "exec()", leaving event loop alive.

I will rearrange the code by the scheme below. Do you consider it to be a proper usage of event loop and QNAM?

Qt Code: 
  1. class myClass : public QThread
  2. {
  3. public:
  4.    myClass () 
  5.    { 
  6.        connect(this, SIGNAL(doComm()), this, SLOT(onDoComm()), Qt::Queued);
  7.    }
  8.    void run()   { exec();  }
  9.    void startComm() {emit doComm();}
  10. signals:
  11.    void doComm();
  12. slots:
  13.    void onDoComm() {_http.post(...);};
  14.    void isFinished(QNetworReply* r) {r->deleteLater(); emit doComm();}
  15. private:
  16.    QNAM _http;
  17. };
  18.  
  19. main
  20. {
  21.     myClass a;
  22.     a.start();
  23.     a.startComm();
  24.  
  25.     int i;
  26.     std::cin >> i;
  27. }
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