"Waiting for in time (RT PXI target) real answer" error when the program is waiting interruptions

Hello

I developed an application to detect interruptions generated by an electronic card and act accordingly. The program was developed in labview, but she calls a dll; created with labwindows. The dll is scheduled to open the visa communication, select the events and install the interrupt handler and when an interruption is detected, it reads the value of the different registers of the map and returns to labview to view.

The problem is that when the program expects an interruption, a prompt appears with the message "Waiting for real-time (RT PXI target) real answer" and the only option I have is to click on the button to disconnect the pxi or just wait. If I wait and I generate an interrupt, the prompt disappears and the application view data as it was planned.

To wait for the following code the interruption has been programmed into the function:

While (flag == 0)

{

Sleep (1000);

}

When an interruption occurs, the value of flag set to 1 and function continues without any problem. I am not really sure, but here is probably the problem and it probably isn't the best way to wait for a break because the sleep function suspends the thread to the configured time, but at least the load calculation in the PXI is between 0 and 1%. I was wondering if anyone knows how to wait for a break without 'lost' communication with PXI and if there is a better way to do it.

Any response will be welcome and thank you for them,

Jaime

Hey there.

You see problems with connectivity it's because the thread by DEFAULT CallLibrary nodes running in is the UI (UI) thread - UI thread manages also the important things like, say, communications (especially all the connections for the VI server) and other things that you could run all the time.  A CallLibraryNode is not, by default, intended to be used to execute code that runs for a long period of time.  If you want to do this, you assign the execution of the CallLibrary node to run in the context of a LabVIEW run-time engine thread (by selecting to make it work "in any thread") and not the UI thread.  This can be done through the properties of the CallLibraryNode.  By selecting "run in any thread" the call DLL will be generally in the context of the thread running in the run LabVIEW, which is usually what is meant when even.  The VI CallLibraryNode color change of Orange (UI) to blue (LabVIEW thread) so that you can quickly tell what context the appeal will be in.

The reason the interface thread user is the default thread is because most often DLLS calls need to be serialized (because of functions is not not thread-safe) and so it serves to protect the integrity of the system.  However, if you know your threads are thread-safe, or you will use these threads for a while, it is best to program the CallLibraryNode to use a Thread of LabVIEW execution rather than the UI thread.

For more information on this review on these pages:

https://decibel.NI.com/content/docs/doc-9069

http://zone.NI.com/reference/en-XX/help/371361J-01/lvexcodeconcepts/configuring_the_clf_node/

DLL' happy ing.

-Danny

Tags: NI Hardware

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    Take a look at this tutorial: http://www.vistax64.com/tutorials/117229-icon-cache-rebuild.html
    Note: use an Option. It is easier. For the benefits of others looking for answers, please mark as answer suggestion if it solves your problem.

  • I have a chess program that I would like to transfer (copy) to another computer. How can I download a CD when the program is too large for the CD?

    The CD can usually take 700 MB, and the chess program is much bigger.

    Use a DVD, they will hold 4.7 GB.  However, it probably won't work... you will probably need get the installation package.

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