check thread status in gwt

I have gwt app. And I want run something in the different thread. After thread was created I return status something like "in progress". Then thread fail (file not found, or something else) for example. How I can check thread status and return status to user? Check status every N sec? Any suggestions?
What you describe is named 'Polling'. There also are some GWT 'Push' solutions, where you keep the connection open and send events as they happen; do some searches on 'GWT push' and look at the literature.

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