shared variable bug

[rberger]

Hello all:

With the attached project, run the shared variable bug.vi and press the button labeled Press me First.  Then press the button labeled Press me Second.  On both string indicators there shoud be text that say Hi There! in both string indicators.  However, sometimes I only get only a Hi OR There! (did I say OR ) and sometimes and empty string for both itring indicator outputs.

Note this only happens when you FIRST run the VI.  To repeat the bug, you will have to stop the VI and unload it from memory.

Can somebody else confirm this behavior?  If confirmed, this is obviously a bug.

Robert

[rberger]

Excuse my typos & I forgot to mention I'm using LV8.5

Robert

[Matt_W1]

I get the same behavior which doesn't seem correct to me either but I'm not that familiar with shared variables.

The variables are outputting a no value warning when they mess up. So you could that to make a work around. Also adding front panel controls that are data bound to the variables seems to make the problem go away.

Matt W

[vt92]

There seems to be some sort of latency when you read the value of the shared variable.   I took your example, but I moved the read of the shared var. outside of the loop.  After the first boolean is pressed, it took two loop iterations ~100 mS for the shared variable value (read) to update.

[rberger]

Thanks for the reply.  But the problem is I have two separate apps.  Each loop in my original attachment can be viewed as a separate app.  Thus, changing the architecture would be a major pain.  I must add this did not occur in LV 8.2.
My argument is it's a bug in LV 8.5

Robert


Message Edited by rberger on 01-29-2008 10:19 AM