Hello, I am trying to learn Actor framework. But all the online material I found involves nested actors, i.e one actor launching another actor. But how does two parallel actors communicate. I am trying to find material on that. Just to remind you there is no parent actor. The launcher is a simple VI that just launches these two actors and they need to communicate between them. Launcher closes after running the 2 actors. So how do I do that ? Thank you.

Yes, you should learn a bit more about user events. The user event refnum is never created, it is just a constant that cannot be used for anything. That invalid refnum is sent to one actor that just stores it. The actor that receives the user event refnum could generate an event in the sending actor using that refnum. Don't do that. Do not use user events to communicate between actors, use messages. All you need to do is to send a stop message to the other actor when one actor terminates. You also need to make sure your helper loop stops. Look again at what LucianM posted: - create user event - register for that event - call actor core - generate event after actor core returns (ignoring errors!) - destroy user event You can also do that in other VIs: override Pre-Launch Init create and store the stop event refnum override Stop Core generate the stop event, then destroy the refnum send stop message to other actor

Blocking code is not the problem here. The parent Actor Core will execute in parallel to the UI. Check the error output of Send Update Numeric Indicator. The enqueuer is invalid. When you read the enqueuer of Actor B in Actor A's Actor Core, you are reading from the state before it received Actor B's Enqueuer. Create another message that you can send from AC-A to itself that uses the enqueuer from the current class data for Send Update Numeric Indicator.

LabVIEW

Communication Between Parallel Actors

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Here is the final product. Thank you once again for all your help especially you @cordm. I still have a lot to learn in Actor Framework, will ask more questions when I do so.