How do I run two sub-VIs in parallel and have the faster VI continue to execute while the slower one completes?

I have two sub-VI's - one that makes a laser distance measuring device turn on and return a distance, and another that moves a platform upon which a target is mounted that the laser reflects against. The laser VI takes well under 5 seconds to complet. The platform-moving VI, on the other hand, requires about 30 second. I would like to be able to have the laser on AS the platform moves. Of course, I can accomplish this by running the VIs seperately. However, I would like to control them from a master VI. Currently, the laser turns on as the platform begins to move but then turns off, since the master VI waits on the platform-moving VI to
complete. Any help with this seemingly simple dilemma would be greatly appreciated.

In order to synchronize the two VI's I would recommend using a global variable. By creating a global boolean, you can make reference to it in both programs, and control when your "laser" subVI terminates.
Basically, have your "laser" subVI wait until the global boolean goes true to stop execution. Have the boolean initialized false, and then have your "platform" subVI write a true to the global boolean when it has finished running. This will keep you laser running until the platform has completed its move. Good luck!

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Running two sub vis in parallel

I need to run two sub vis of a main vi simultaneously in parallel.
one sub vi is to run a demo and the other subvi is an application.The demo should run as a small window and the application should run in background

As i said
"If you have the demo vi as floating and the other vi as Default (not floating), the demo vi will allways stay on top"
If you still have problems, just post your vis, (without any unnecessary code), or ask something specific
Message Edited by Pnt on 04-21-2009 08:18 PM
Attachments:
Clipboard-2.jpg ‏44 KB

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How to run two sub vi simultaneously??

i need to run two sub vi simultaneously in one main vi, becasue it is a must the two sub vi run exactly at the same time, but now i find that if i put they in one diagram ,in fact they are not exactly run at the same time. if you see in high light mode Just like the attached simple example code. any one can help me to handle this to run the two subvi exactly at the same time ? how to do it ? thanks so much.
Attachments:
how to run subvi simultaneously.vi ‏11 KB

You are correct, they will not run at exactly the same time. What is it you are actually trying to do? What platform are you developing on? What version of LabVIEW? What processor does your target system have? This information is vital in order for us to assist you. In a nutshell, unless you are running a real-time OS, then the OS you are running is not deterministic. When you say "at the same time", what are you actually referring to? As a note, when executing parrallel operations in LabVIEW, the execution order may or may not be the same with the highlight bubble on as it is when it is running without highlight execution. It is highly unlikely that you will be able to just run two sub-vis at the exact same nS. If you are using DAQ boards, you accomplish this through triggering. Please give a detailed description of what you are doing, and what you see the road blocks being.
Thanks
Paul <--Always Learning!!!
sense and simplicity.
Browse my sample VIs?

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How do I run two sub-VIs in parallel and have the faster VI continue to execute while the slower one completes?

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