Which Wait-on-Notification's (of all types) are currently Waiting?

[evan1138]

I may have a wait-on-nofication deadlock. Before I use the Navy method (beat to fit, paint to match) by changing a bunch of WoN's Wait-on-Notification-with-History, it would be great simply to be able to see which WoN's are currently waiting. In this way I could maybe see which WoN's were participating in the deadlock and hence rethink my dataflow pattern. I haven't found a tool highlight WoN's, list WoN's, etc. But it sure would be handy.

Any info or ideas?

[tst · Accepted solution]

The desktop execution trace toolkit might show you who's waiting (or at least in which VI). I haven't used it so I'm not sure.

Another option for handling this in code is to use a timeout and not do anything if the timed out output is true, but this is most likely going to be a hack instead of a real solution in your case.

[ColdenR]

It seems like you could also detect which WoNs are using the timeout, as tst said. Your "timed out?" output could just go to an indicator for debugging purposes. If your WoNs are in loops, you could set a small timeout and thus update that indicator more frequently.

[evan1138]

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@Colden R wrote:

It seems like you could also detect which WoNs are using the timeout, as tst said. Your "timed out?" output could just go to an indicator for debugging purposes. If your WoNs are in loops, you could set a small timeout and thus update that indicator more frequently.

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Yes, thanks, I'm trying a variation on that now.

[evan1138]

I finally had time to deal with this bug, and using timeouts and errors with messages I was able to "ladder" up to find the deadlocked WoN's. Tedious, and I ultimately haven't solved it yet, just inserted a workaround for now. Thanks to all. The solution goes to tst who was first with the timeout suggestion.