Another possibility, linking vi 2 separate appellants

The goal: start a sub - vi one of both parents Vi

Problem: Determination of the State of execution of the Sub VI.  If the Subvi is not ongoing execution and then run from whatever vi is started first.  The Sub vi is a consumer to producer loops that run in Vi of the parent.  The parent vi can be run, or they can be run at the same time.  The Exec. State does not differentiate between the running and reserved to be executed.  This means that if the Sub VI on the block diagram of one of two parents VI then there isn't a way to know if she should be performed.

An example of the Vi is included below.  Vi Coordinator is the Subvi.  I need a way to run the Subvi of whatever this, or who is called first.

Hey eximo.
Your description and VI, you provided I think I have a knowledge base of what you're trying to do. That said, I would like to know if I'm heading down the wrong road. Basically you have 2 main VI each call to a Subvi, but you only want the main VI which runs the first to access and execute the Subvi. I think that the route that you may need to take would be to place the Subvi in a case structure that verifies the value of a global variable that is shared by the two main VI. The 2 hand VI will change then the value of the global variable if it ends and calls the Subvi. However, the downside of this is that you may encounter race conditions. The other way to do would be to reverse your program hierarchy where now monitor you the status of the Exec of the hand two VI and say the Subvi to run data of the hand VI will idle first. In this way, you can be sure that you are only the Subvi execution once and eliminate race conditions. I hope this helps!

-Ryan S.

Tags: NI Software

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