VI's GUI events disturb another VI's work

[sergey 671]

Platform: Win2K, LabView 6.0i.

I saw that some VI's GUI events (like pressing a mouse button on the VI's caption) pause the VI for a while and may disturb the work of other VIs too. For example, open two attached files and run them both. Then press and hold the left mouse button on a.vi's caption - you will see that both a.vi and b.vi will stop counting for a while.

My problem is that the "b.vi" in my application is a time-critical one, so if the user plays with the application GUI it can crash the application. May I disable such a behaviour by setting VI priorities or somehow else ?

Thank you,
Sergey.

[storeyk]

Well i downloaded your 2 vi's and left mouse button clicked and held down, etc. and i did not see either vi stop counting, or any pause at all.

I'd suggest to try setting the time critcal vi to highest priority, and maybe the other one to lowest priority. If that doesn't work, try cutting out all unnecessary code and indicators and only use globals and locals if absolutely necessary (see performance tips in LV help). If you still have problems you may need to upgrade your computer, clean it up (delete unused programs/files) or reformat/reinstall.

[mikeporter]

I agree wholwheartedly with the other reply. The operation you discribe is not normal and hasn't been for at least a couple major revisions. Something very funky is going on with your system.

Mike...

[sergey 671]

Meanwhile I've got some info from our local NI representative and they say there really is such an effect under W2K OS, so I do not think that the problem is in my specific environment. In Win NT the behaviour is different - only GUI is freezed, but the VI continues to run in the background.

[mikeporter]

Far be from me to suggest that a local rep might be blowing smoke, but I just retried your two VIs on a Win2k machine and nothing I do causes the other VI from even hesitate--let alone stop.

What exactly is the effect? Is there a knowledgebase entry explaining it? Pin your local rep down and get specifics.

Mike...