TCP opened briefly crashes LabVIEW

Hello LabVIEW forum! Long time no see. I have been away doing other things but LabVIEW... I am back.

Background:

I'm working on a project where I need to make a TCP connection on a Windows 7 computer. The Windows machine will intentionally restart for each test. When it starts, I need make a TCP connection to a server that starts automatically on the Windows computer and send commands. While it is booting, I try to connect, get an error, try again, etc., until the connection is established.

The problem:

This computer name is not resolved by the DNS or the hosts file. If I try to connect using a host name and host name cannot be resolved, LabVIEW will freeze for a few seconds. If I click on the Red Quit button, I get the error not responding. He will eventually recover and gives me an error 54. The time-out period is not relevant in this situation. No matter how long or how short I put it in, it always crashes LabVIEW for about three to five seconds. If I try to connect by IP address instead, so I don't see this problem. If the machine is off, I just get a time-out error but LabVIEW does not freeze.

I can't post code, but try this: write a VI with an infinite while loop and an indicator connected to the Terminal i and place a delay of 100 ms in it. That and note that the number increments. Now, create and run a second VI with the TCP inside open and use a machine name that does not exist. What I see is that the number in the first VI leave increment. I'm using LabVIEW 2014 32-bit on Windows 7 Ultimate 64 bit. First, open a console and try the ping command on the name that does not exist, you are trying to connect to and verify that it prints an ip number. Some providers Internet will solve all non-existent host names to an IP address they have for their benefit. If this is the case then you will not be able to reproduce this bug.

I have a workaround (putting an entry in my hosts file), but I thought I would mention this possible bug. In addition, it gives me the opportunity to say hi to all my old friends on my favorite Ant! (the list is long but you know who you are)

LabVIEW called Winsock for all network operations. Most of the Winsock operation is synchronous. This isn't a big problem for most code LabVIEW LabVIEW is multithreaded and performs the nodes in some thread the current VI is to. However, some features require access to a global data space and are protected by other means. It can be a global mutex and sometimes it is also solved by forcing the node to run always in the interface of LabVIEW user thread that also runs the message windows and Winsock loop hang in this message loop to do its own internal synchronous pseudo operations.

IP address control is something you can try. It can also block because of the internal Winsock hanging in the application message loop, but maybe it will not be so that you can work around the problem. There is no way for a normal application using the Winsock API in order to avoid delays in internal Winsock for synchronous functions, and the resolutino address API supports asynchronous really not with variants.

Tags: NI Software

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