Launching a never ending vi in sequence

Hi!
I have a vi that can basically be represented by a while loop that never stops until i press a button.
I want to load and run this vi from a sequence without it hanging up that sequence.
Also, at the end of the sequence it would be great if it could end the loop in the vi.
For this last part I made the vi read out a variable in my locals and stop the loop as soon as it is a certain value.
(I think this is a good solution, but any suggestions are of course welcome )
For being able to run the rest of the sequence, even though the vi never ends, I was less successful.
I tried putting the vi in a subsequence and then running that subsequence in a different thread.
However, stepping through the main sequence, it does steps over the call of the subsequence,
but then the main sequence still freezes until i stop the loop in my vi.
What am i doing wrong exactly? Any help would be much appreciated!
Solved!
Go to Solution.

Run Asynchronous VI basically uses a sequence call module with the "New Thread" option, but I don't think it does much more than that. I think you still have to do ExternallySuspended and/or Termination monitor in your vi. At any rate, I recommend against using Run asynchronous vi as there have been issues with using that step type (confusion over what passing ThisContext means for the most part). See the following link for more details about the issues with Run asynchronous vi if you are interested:
http://forums.ni.com/ni/board/message?board.id=330&message.id=28101&query.id=753835#M28101
As far as termination monitor not detecting whether or not the original thread has completed normally, that is not its purpose and not always what a user might want. For example, you might have a worker thread that you want to keep running even after the thread that launched it completes. There might even be more than two threads in the execution and the execution technically isn't complete until all threads are done, including the asynchronous ones. The purpose of the termination monitor is to give the code module a way to detect when the user is requesting a terminate or abort so that it can return and allow the execution to terminate or abort normally (an execution cannot terminate or abort while a code module is still running).
Like you are suggesting, you can probably pass in the original caller's thread as a parameter to the asynchronous sequence and your VI and call Thread.WaitForEnd on it with a 0 ms timeout to check if it's done in your loop. You need to make sure that you unchecked the "Automatically Wait for the Thread to Complete at the End of the Current Sequence" setting on the advanced panel of your sequence call step though or your threads will both be waiting for each other and never complete. Also the sequence view of the execution is likely to switch to your asynchrous thread at the end because it will be the last thread running, so if you don't want that you should probably just go with passing a boolean variable instead and leave the setting "Automatically Wait for the Thread to Complete at the End of the Current
Sequence" checked. Do not ever pass ThisContext from one thread to another though as that is the source of the problems people are having with Run VI Asynchronously.
Hope this helps,
-Doug

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Attachments:
Report Correct.txt ‏12 KB
Report Upside down.txt ‏15 KB

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