In my Qt Multi-threaded program, moveToThread() & QCoreApplication::postEvent() dose work only msleep(1) is followed

sinjohr

I am writing a 2-threaded qt program, one thread is main(gui) thread and the other is network thread.

My problem is that the moveToThread() & QCoreApplication::postEvent() mechanism only works when provided with the following msleep() call.

In my network thread, the following code has a problem,

ServerWindowWrapper wrapper;
wrapper.moveToThread(QApplication::instance()->thread());
QEvent* ev = new QEvent();
QCoreApplication::postEvent(&wrapper, ev);
//msleep(1);

In this case, my posted event is ignored. However, if i uncommented the last line "//msleep(1)", the program works fine as I expected.

Someone told me that an eventloop mechanism depends on sleep dose mean the software design is wrong.

So, I want to know whether there is a way to remove "msleep()" without changing my program's behaviors.

tarod.net

@sinjohr I think this things happen. Working with threads is not always a cool path.

According to the documentation, a QEvent::ThreadChange event is sent to the object just before the thread affinity is changed.

You can try to handle the event.

Another option is using the overloaded method

void QCoreApplication::postEvent(QObject * receiver, QEvent * event, int priority)

and use Qt::LowEventPriority.