Functional global variable question

[joaorob]

Hello,

I fully understand how a functional global variable (FGV) works and its purpose but I have one last question.

How do I guarantee (or how is it guaranteed) that my sub-VI (the FGV one) is not re-entrant, in other words, how am I sure that when an instance of the FGV is running it does not loose the processor to others?  Is this an option that I can choose in a sub-VI or is it related to the while loop or case strucure that compose a FGV?

Joao

[johnsold]

Joao,

This question would be more suitable for the the LabVIEW Board rather than this one.

Re-entrancy is set (or not) in the Exceution page of the VI Properties dialog. It applies to the entire subVI. Non-reentrant is the default for new VIs, so your VI should not be reentrant unless you set it that way or copied it from a reentrant VI.

Lynn

[0utlaw]

Hi Joao,

For a little more background on configuring reentrancy and the options you have available if you do want to make a subVI reentrant:

LabVIEW Help: Reentrancy: Allowing Simultaneous Calls to the Same SubVI

https://www.ni.com/docs/en-US/bundle/labview/page/reentrancy-allowing-simultaneous-calls-to-the-same...

As Lynn said, all new SubVIs will be non-reentrant by default.

Regards,