Update of the indicators of the façade is trolling in the test of the functions in the provider DLL

I'm looking to see if someone can explain a behavior to display weird LabVIEW I see when to test some timeout works in a third party DLL. I have a work around in place but I would still like to know why, without the workaround, the information displayed by the indicators on the front panel are not synchronized with what is happening in the execution of the VI, even though I tried all sorts of things to impose the synchronization. Note that to run the VI in a useful way, you need to be able to communicate with a Galil axes via an Ethernet controller, and which, for the most part, limited this discussion to what the experts among you know happen under the hood of LabVIEW in situations like this.

This is what looks like the VI when my work around (false wait added) is active. It's a small state machine that uses the elements of the array "Test Sequence" to tell him what to do in each step of its implementation. Here he plays a first time-out value, sets a new value of timeout, reading again, the timeout by asking a READING of the controller (without having first asked to say anything), followed by restoring the initial time-out and then tests to stop.  The two indicators in the red rectangle are there to show the current status of the execution, and it is this pair of indicators which are not synchronized with the State of the actual program.

When execution completes, it is what we see.

If the false timeout is too short, then the indicators are not synchronized with the State of the program, or in this case, with the other.  Note that the only time wherever the VI display is static enough for me to take a screenshot as it is during the period of "Test Timeout. When the time-out occurs Finally, things be synchronized and the same results are displayed.

Here's the code.  I am also attaching a folder zipped with the code, just because I don't know if the extracts are smart enough to include all the dll referenced by library call nodes.

Here on the left of the loop indicator 'State' and 'Index' terminals can be seen. The 'fake Wait' needed to make the indicators work synchronously appears below in the same area. Before coming with this 'fix' things I've tried, what has not worked, were:

  • addition of the structure of flat sequence seen here with the indicators in the first panel
  • Entrance to the 'value' property nodes using linked to two indicators with their outputs error Garland at the entrance of the error on the function 'G Read' (test timeout).
  • defining indicators for "synchronous display" (apparently this parameter actually only works with the multi-threaded code, which I don't believe it is)
  • setting false property to "postpone updates on the front panel.

Another thing that worked linked a "probe" to any data path entrance side of the conditional structure. I thought that it causes also a few milliseconds of delay as the expectation.

My best guess at what happens is that display updates are "launch and forget" actions that occur on parallel execution paths in the single execution thread and function on obtaining some of the main process to complete time slices. But when the main process is the name of an external library, which, outside the library can't share time with all other processes that can run in the same thread.  All this makes sense?

This is because all these CFLN calls to the dll are set to run in the UI thread (to view the color orange on the top of the node).

If they eat the cycles in the UI thread, they may not leave enough cycles to LabVIEW to make updates to the user interface of the front panel.

What make these 3 part of the dll?  They need to run in the UI thread?  Is there a problem with the standby so that the DLLs are not pounding the UI thread?

Tags: NI Software

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