If you play with the demo application, you'll soon find that it works fine, just not exactly as I described before. I stated that "(the code) sends pingMsg back to the owner every five seconds." As the following image shows, that isn't exactly so.
This image shows one short testing session. During the testing, I started the thread. That caused two messages to be logged. The initial value of 0 is sent from the thread immediately when the thread is started. After that, the main thread sent a new value 42 to the worker thread, and that resulted in an immediate ping response.
After that, I didn't click anything for 11 seconds, which generated two ping messages, each sent 5 seconds after the previous message. Next, I clicked ...
