TCP IP multi client connection does not work correctly

My program is a software communication client server where data of a cDaq collector server sends data to the client, and the client sends the command to the server to run. The problem I've encountered is when I sedn a command to the server, it shows that the server is receiving but it it is not running properly. Please take a look and see where I was wrong. I was stuck on this during some time. After this post, I'll add the subvis more

Note to admin - screws removed by the request of the user.

Missing Untitled 1 library.

What does "not execute properly" mean?  What is it to do or not to do, and what you expect it to do?

I see a problem in the Subvi the TCP - IP protocol client.  Why are you enqueueing an element then immediately made it?  You go to the queue again after the end of the Subvi.  But you have a loop in parallel when remove you the element.  You have a race condition.  Two things can happen.

1. data gets in queue and removed inside the Subvi.  When it ends, it gets queued again in the same queue.  Then the parallel loop might it dequeue and work with it.  I'm guessing that if this order of execution occurs, it probably behave correctly for you.

GOLD.

2. data gets queued inside the Subvi.  The parallel loop with the dequeue is sitting there waiting for something, removes the element and works with.  Then the dequeue inside the Subvi that's always waiting for an element in the queue who won't, because now you have locked the code.  The loop cannot iterate to get more and more data in the queue.

You have a lot of strange queue operations past in this sub - VI and an another Subvi in the parallel loop.  Why you get another reference to the queue, rinsing, then release this reference to queue.  I won't even try to guess how that would complicate the 2 scenarios, I already listed above.

I offer several examples of queue to understand how they work.  Any given queue must have 1 wait operation, otherwise remove it will run to steal the other's data.

Tags: NI Software

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