Local variable default value

Hi
Just a quick question to get me out of a hole..... I am using local variable to control while loops, and based on a counter value, it turns it on or off. When i probe the value of the actual boolean, it comes up not exectuted, but the local indicator value is true???? is there any way to change this?? i need to to remain false, UNTIL it goes true!
Cheers
Peter
Solved!
Go to Solution.

I think that "Ravens" has hit the nail on the head. Using unprotected shared resources (like local variables) in parallel will open the door to race conditions... the bane of any programmers life!
Here are some useful resources which further explain this concept.
Using a Local, Global, or Shared Variable in Parallel Loops Can Cause Race Conditions
http://digital.ni.com/public.nsf/allkb/4F3CC921B4179F9F86256A3B0045CE2D
Tutorial: Local Variable, Global Variable, and Race Conditions
http://zone.ni.com/devzone/cda/tut/p/id/7585
The first link also mentions the producer/consumer articeture and the semaphore. Both great solutions. However, correctly sequencing your source code (using things like error clusters) will help prevent this issue.
Further more, I wonder if you are initialising your variables??
You should write a value of false to the variable before you enter the main body of your code. This ensure that the first time you read from the variable it will return a known value (false). If you dont do this, the variable will return what ever was the last value written to it.
Hope this has been useful.
Rich R
Applications Engineer
National Instruments UK & Ireland

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pho:
[http://file.itpub.net/f/e38876ad4f6efb7e73980488e7d71f8d/4ae940e9/day_091029/20091029_2b04da1232144feba180OrB23SNvXtoT.gif/p/1.gif]
[http://file.itpub.net/f/d93ddfe61e0eaf80429726c61f1a02ff/4ae940e9/day_091029/20091029_3211ffe04bf0302fbab5FRKnbwmH80p7.gif/p/BW_QUERY_Crystal.gif]
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[http://file.itpub.net/f/39a8510104476707ae21c945db93ecba/4ae97949/day_091029/20091029_32dcbb7e7d99141483aesJ9KBJHXN0Kj.gif/p/2.gif]

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create or replace
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Local variable default value

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