Sometimes 'main.py is not responding' message comes out

[spdkimo]

[Step to reproduce]

1. on ioter, Select a device type and click 'Start'
2. After device onboarding, Try to close the device window (or click Power on button)
3. 'main.py is not responding' message comes out

[Cause]
Awaiting for the subprocess to exit, the delay could make the UI not operate, resulting in the error dialog shows up. But in this case, the device window and the error dialog would be disappeared shortly.

[Enhancement]
If there are any progress dialog shows during that time, user would feel comfortable

[junyong-sim]

https://github.com/Samsung/ioter/blob/main/src/common/process_controller.py#L104
The child.wait(timeout=10) blocks user event.
As the result, 'main.py is not responding' message shown.

I think there are three options to solve this issue.

1. remove child.wait(timeout=10) from termination func. But, I can't convince that it doesn't make jombi process. So, we have to do many tests.
2. make thread to execute termination func. But, main should wait termination thread before exit. I think we need to do a lot of job.
3. just keep it as current status for stability.

[spdkimo]

How about showing progress dialog?
It would be more descriptive way to termination process

[junyong-sim]

How about showing progress dialog? It would be more descriptive way to termination process

It's also good idea. My concern is only that this progress dialog will be shown whenever process terminated.
I wonder if it looks good. So, I think we might be able to decide it with a demo.

[junyong-sim]

How about showing progress dialog? It would be more descriptive way to termination process

It's also good idea. My concern is only that this progress dialog will be shown whenever process terminated. I wonder if it looks good. So, I think we might be able to decide it with a demo.

I tried to create a message box while terminating devices. But, it didn't work well.
It seems that all operations was stucked during child.wait(timeout=10).
Do you have any idea about that ?

+    ## Check key Press Event ##
+    def mousePressEvent(self, event):
+        print('mousePressEvent')
+        if ProcessController.is_terminating():
+            re = QMessageBox.information(self, "Info", "Please, wait for a few seconds.\nWe are terminating devices safely.",
+                                      QMessageBox.Ok, QMessageBox.Ok)
+            if re == QMessageBox.Ok:
+                event.accept()
+            else:
+                event.ignore()