Bug discovered in LabVIEW 8.5.1 with reentrant VIs

Hi NI,
I discovered a bug with the way LabVIEW handles the state of front panel controls for reentrant VIs that have the front panel open during execution. Essentially, what is happening is that the Boolean text on the FP button is not getting updated properly. Sometimes it will update correclty, other times it won't. This makes the bug intermittent.
Please see the attached example code for a demo.
Doing the following does NOT make the bug go away:
reentrant_gui.vi --> VI Properties --> Execution --> Check "Clear indicators when called"
Doing the following does make the bug go away:
reentrant_gui.vi --> VI Properties --> Execution --> Select "Preallocate clone for each instance"
However, in theory it should not be necessary to preallocate a clone since the FP values are wired into the vi before it is called (see the simple demo code). Plus, for my application, I need to minimize the amount of RAM occupied by my program, so I don't want to preallocate clones for each instance.
Cheers,
Richard
Attachments:
lv_reentrant_bug_illustrated.llb ‏35 KB

I'm running 8.6.1, and I see what I would expect, when I run your code
Your instance:
copies NUMERIC IN to NUMERIC OUT
Copies its BOOLEAN's property BOOLTEXT.TEXT to STRING OUT
Sets its BOOLEAN's property BOOLTEXT.TEXT from STRING IN
Reads the BOOLEAN (no effect)
Waits 100 mSec
You call two of these in a loop, one fed with the loop counter "i", and a string of "i", the other called with 0.0, and "blah"
The first time up, I don't know what I'll get from the STRING OUT, it depends on what the BOOLTEXT.TEXT property is set to.
The NARRAY 1 is labeled "should contain 0 to N", and it indeed should contain 0 to N-1, and it does.
The NARRAY 2 is labeled "should contain all 0s, and it indeed should, and it does.
The SARRAY 1 is labeled "should contain all OKs". but it really should contain the strings "X","0',"1","2","3",... where X is indeterminate the first time up.
The SARRAY 2 is labeled "should contain all OKs, but it really should contain all "blah"s, and it does.
I don't know why you are expecting "OK".
I see no bug at all.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

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