Strange behavior notifier

Hi all

I was experimenting with the notifiers before using it in a project and have noticed what I think is a very odd behavior. That's what's happening (using vi attached):

  1. Press the button "generate new value. This writes a value to a notifier.
  2. Press "read value". He grabs a reference by name to the notifier, awaits a notification (0ms) and then close this reference. The FP "Reader CV" indicator shows reading the value and "timed out?" If the expectation on the notification function has expired. Also the reference appears in digital form so that we can see what is happening.

Now, here's the confusion . The first time you press read the value that it returns the correct value, then if you tap it again and again and again... you---> waiting for notifying expires each subsequent time.

This behavior is confusing because each time that we are entering a new reference to the declarant is why we should expect the same behavior every time. If we read the same reference every time, I expect to get a value for the first time and the time-out on all subsequent reads until a new notification is affirmed.

Now for double confusion ! Now if you are generating a new value and then press "read value", and then 'read value 2' they return valid data without delay---> what is the difference between urgent "read value" twice and pressing <'read value'="" followed="" by="" 'read="" value="" 2'="">. In all cases, enter us a new reference to an existing notification, he read and close it.

It seems that a new reference is "newest and most unique" when in a different loop?

Thanks for any help,

Steve.

PS more confusion is that we create the reference to the author of the notification in the playback loop once the notification has been affirmed, that we would have NEVER this notification in the playback loop. Unless we use the primitive "wait on notification with history", which by the way doesn't work that would be expected.

An important thing to understand the behavior of the primitive of waiting (and that is documented in the help) is that each instance of the primitive on the diagram retains its own history. The reference is not relevant in this case, it points to the same applicant.

This should also help to explain your second question - each instance of the primitive has its own notification and until it reads, this notification is waiting so he could read it.

Your third question, throw an eye on the previous entry ignore, default, F.

The history queue was created precisely because of this problem and especially to handle a case where you use the same instance for several notifiers (such as iterating over the authors of notifications in a loop). Aid should say that she has some overhead.

Tags: NI Software

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