Global variable update - does not work after faithfully working for 1+ year

[zacharia01]

Hi All,

We have a Labview program that acquires temperature and pressure. The pressure measurement is initialized to zero by a reset but which feeds the zero value to pressure when the button is pressed. This has been working perfectly for last 1+ year. The LabVIEW version is 6.1 and it is running on WIndows XP. Last week, when I returned to the lab, I found that computer is restarted (doesnt happen that often, except for some microsoft update). Eversince, the reset button seems inactive, like it doesnot feed the zero to the pressure variable. I checked the code, everything is just fine as it was. I am puzzled by this behavior. Anybody reported similar problem? or what might have caused this and how I can eliminate it.

Many thanks in advance,

Zacharia

[Ben]

---

zacharia01 wrote:

Hi All,

... Anybody reported similar problem? or what might have caused this and how I can eliminate it.

Many thanks in advance,

Zacharia

---

It is very hard to be sure but this sounds like a race condition.

I wrote this Nugget on Action Engines to help people get over using global variables and expand their LabVIEW POWER.

Have fun!

Ben

[jcarmody]

99.99% of all Global variables are evil; you can't trust them.  This one finally turned on you; it probably was planning it for a long time.  I just hope nobody got hurt.