Datasocket bug in Win2K - constantly updated
= OVERVIEW =.
I have a simple Datasocket system which produces a very strange problem on Win2K
After a variable duration (from 30 seconds to 30 minutes), the player datasocket simply stop receiving updates of the writer.
The system features a base Writer DS and DS player that communicate over the DS server localhost. I've included the reader and the writer screws for your tests. In addition, it seems to be easier to reproduce if the screws are compiled into executable files. I've included the executables for the tests. The problem is reproducible when the 'reader' is actually a C++ (using Measurement Studio) program which is integrated into an OCX component (not included).
NOTE: This bug doesn't seem to be reproducible under WinNT.
I spent a lot of time this system... with no luck debugging. I've narrowed it down so that it is very reproducible. Just run the Datasocket server and the two clips EXEs on Win2K (Professional) and wait a while... eventually, you will see the Player stops to get updates.
= DESCRIPTION OF THE SYSTEM =.
The writer of the DS to connect to the DS server in 'write' mode and sends an array of doubles. An "attribute" property is specified as another array of doubles. The writer then updates the connection. The two paintings are supposed to represent the values and timestamps.
The DS drive connects in mode 'reading-auto-update. He is waiting for an update and then reads the table and its "table of attributes.
Take a look at the examples attached... they are very simple.
= PROBLEM =.
The problem is reproducible on Win2K machines.
After a variable period of time (usually no more than 10 minutes) the single drive ceases to receive updates. The DS connection is reported as "Active: connected" and the status is 'ConnectionActive '.
= NOTE =.
I use LV6.02 and the latest version of Datasockets 4.0 (370).
2 screws are in the same delivery system: the User Interface.
On the PC power management is set to "always on" and the power to save them all, functions of sleep, screensavers, etc are disabled.
I use the 'old' datasockets screw (open connection. read/write double vector, close, etc.). I realize that the "bug" I'm reports could in fact be fixed if I used the new Datasocket screws that come with LV6i, but we really don't want to use these screws we find the old screws better because:
1. the older screws seem to be faster to the writing of the major vectors. We discovered this through tests.
2. reliability of maintaining connections. The older screw seem to be more to the maintenance of the connections.
3. the new screws have difficulties getting the items appear (and with the appropriate icon) in the window "Browse measurement data.
No other significant network activity is seen when this bug occurs. It seems to happen randomly.
Tags: NI Software
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