run code simultaneously

[GRMAN]

Hello, i have an application for logging temperatures in different chambers. Each chamber has a start button to start the timer and logging of temperatures. The code is pretty large. I wanted to be able to run the code for many different chambers simultaneously. For Example, Press start button on Chamber 1 and have that code run. Then Press start on chamber 2 and have that code run while Chamber 1 is still runnng. The code is too large to have a lot of different case structures. I was hoping there was a way i could do this without making a lot of subvi's and Globals. Any suggestion is greatly appreciated.

Mike

[DOC (-) doc]

this is not a problem : you can define it as a VItemplate and run several processes simultaneously

[LV_Pro]

Without having any real information about the structure of your program other than "the code is too large to have a lot of case structures" it is hard to make any definitive statements. You can create indepent vi's for each chamber that encapsulate those functions that are specific to the chamber, which can communicate with the main control loop by global, LV2 globals (A.K.A. "Uninitialize Shift Registers"), Queues, etc. Depending on how the program communicates with the various chambers, you probably have one point of communications, whether GPIB, serial, Analog I/O card,whatever so this part will have to be a function common to all. It will probably require restructuring the code, realizing the common functions vs what are chamber specific. With more information we can probably give more detailed answers.


P.M.

[GRMAN]

This is the vi i am using for stall 1 but i would like to use it for all stalls, allowing stalls to run simultaneously.

[unclebump]

Can you save it as a 7.0 format?? I'd like to look at it.

[GRMAN]

HERE IT IS THANK YOU FOR LOOKING AT IT.

[unclebump]

Still tells me that is a 7.1 format.

[GRMAN]

i AM NOT SURE IF IT SAVED RIGHT, IT IS GIVING ME ALOT OF WARNINGS WHEN I SAVE IT.

[Ramin_E]

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@GRMAN wrote:
Hello, i have an application for logging temperatures in different chambers. Each chamber has a start button to start the timer and logging of temperatures. The code is pretty large. I wanted to be able to run the code for many different chambers simultaneously. For Example, Press start button on Chamber 1 and have that code run. Then Press start on chamber 2 and have that code run while Chamber 1 is still runnng. The code is too large to have a lot of different case structures. I was hoping there was a way i could do this without making a lot of subvi's and Globals. Any suggestion is greatly appreciated.

Mike

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I did something just like this a while back that worked well for me. This way you wont have to re-write or restructure your entire code.
The problem is that you can not have multiple instances of the same VI with the same name in memory, so what you have to do is create multiple instances (copies) of that VI with different names and then you can run them all simultaneously.
I wrote an application (very simple code) that does this. This utility loads a VI, copies it to another location (i.e. temp directory), renames the VI, and then runs it, after running it deletes the copy from HD, VI remains in Memory. Repeat this process to run more instances (rename the copy uniquely every time, I used a random number generator and included it in the name of the VI).
Caution, if you use a global variable, it will be shared among the instances and can cause problems.

Attached is my VI application-
Good luck.