usage of "get queue status".vi

#1 07-29-2008, 03:10 AM

I want to show the current status (busy indicator) of my program (producer/consumer routine).
In consumer routine, I checked the current queue status by # element in queue in "get queue status.vi".I anticipate "non-zero" value in the number of queue when one or more event was happened.(As you know in the attachment, I force to insert a time-consuming code for 2 sec to stay in the same iteration number.)
 
Strangely, as you can see the values,  I can't check the event (only 0 of # element at an event) although the event value was passed to consumer routine.What should I check to realize my purpose????? 07-29-2008 02:05 AM? labmaster? ?? ?????

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#2 07-29-2008, 03:40 AM

Hi labmaster,
how many time elapsed between read the status and receive the element? It could be that you read the status and nothing is in there, but your dequeue function has a timeout of -1 so it will wait til it receives the next message.
Mike

#3 07-29-2008, 04:10 AM

Thank you, MikeS81 ,
 
I understand what you mean.
 
Anyway, I don't want to use timeout option in the consumer routine.
 
Therefore, I send a useless event before the main event.
Is it strange?

#4 07-29-2008, 04:40 AM

Hi labmaster,
use the "-1" option. I´m not sure why you need a useless event. Send only the events you need.
Mike

#5 07-29-2008, 04:10 PM

Why don't you want to use a timeout in the consumer loop? As it is, the code will only work if there is a timeout so that the consumer loop spins around so you can catch the element having been placed in the queue.

#6 07-29-2008, 08:40 PM

Auctually, the timeout option was not success in my trials.
When I set to 20 ms or 200 ms, get queue status.vi was not catch the queue state.
 
 

#7 07-30-2008, 01:10 AM

labmaster wrote:
Auctually, the timeout option was not success in my trials.
When I set to 20 ms or 200 ms, get queue status.vi was not catch the queue state.

Hi labmaster,
if you use a timeout, then "get queue status.vi" get nothing because there is no message. Why do you need the status check? If you really need it, you can use a parallel loop in which you read the status of the queue.
 
Mike

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usage of &quot;get queue status&quot;.vi

usage of "get queue status".vi