usage of "get queue status".vi

[labmaster]

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?

메시지가 07-29-2008 02:05 AM에 labmaster에 의해 편집되었음

[MikeS81]

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

[labmaster]

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?

[MikeS81]

Hi labmaster,

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

Mike

[smercurio_fc]

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.

[labmaster]

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.

[MikeS81]

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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.

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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