The basic setup: I've got two VIs running in parallel. VI1 is the main VI, and VI2 is launched dynamically from VI1 (and is displayed in a subpanel). On close, VI1 waits for VI2 to complete before it stops. In order to share data between these VIs, I've been using a DVR. Since VI1 initializes the DVR, the DVR stays in memory throughout the lifecycle of VI1 and I'm able to read data back from it in VI1 before it closes. Then I made things more complicated: I updated the data of the DVR to be an array of DVRs. With this setup, VI2 is able to create new items and add them to my DVR of DVRs, and everything works great. That is, until it's time to close VI2. When this happens, the DVRs that were created by VI2 are no longer valid, and I'm unable to access the data in these from within VI1 (I get error 1556 when I try to access the data). I've tried a few things (such as creating these new DVRs in a functional global), but without any success. Any suggestions? My guess is that garbage collection is cleaning up the DVRs from VI2 as soon as it leaves memory, but I'm at a loss for a good way to get around this issue. Many thanks!

LabVIEW

@paul_cardinale wrote:

How about a single DVR to a map. Then access data by the key name of the map.

You'd still have the limited lifetime of the reference, and the risk of race conditions.

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