actionLib: what is `preempt` and how to use it?

asked 2015-09-29 01:40:09 -0500

I'm following the actionLib tutorial.

I found in both GoalCallbackMethod and ExecuteCallbackMethod tutorials, the server use either callbacks or isPreemptRequested to handle the preempt.

But I didn't find anything related to preempt in the client side.

So I'm wondering how the preempt works? How could I send a work to server and say it is a preempted work.

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