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CICS TS 1.3 virtual printer fix?

We are on CICS TS 1.3. We have a printing function the first write to a TD queue that has a trigger level of 1...

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This worked fine until we introduced a virtual printer. This virtual printer is part of a printing software package. The transaction that offloads the queue runs faster than the one that loads it. Consequently, what should be a single page report becomes broken into a multi-page? How can we get these back in sync?


You might be stuck and have to put up with the split pages unless you can alter all the applications that are using it - if the printing function is isolated in its own XC LINKed program then you should be able to fix things.

I think that what you want to do is alter the Trigger level for the TDQ so that the printing transaction does not get initiated until all of the lines have been sent to the TDQ. This means altering the applications that are using the TDQ. You have also got to guard against multiple writers of the TDQ at the same time (but I hope you are already doing this).

Define the Trigger level for the TDQ to be zero, meaning no ATI of the printing transaction.

So the printing applications should be:

1)  XC ENQ on the TDQ to stop multiple writers 
2) write all the lines to the TDQ 
3) XC SET TDQ TRIGG(number of records written)  which should start the 
printing transaction 
4) go into a loop checking XC INQ TDQ NUMITEMS(n) until n=0 showing all the 
lines have printed or hang about for a bit until at least 1 record has been 
printed 5) XC SET TDQ TRIGG(0) to stop the next usage starting the printing 
6) XC DEQ the TDQ , so letting other people use it. 

An alternative design is not to use Trigger facilities on the TDQ but initiate the printing transaction directly (that depends on how the printing transaction works) as part of the print routine.

A further sneaky thing to consider is that IF you can identify the last line of the set of lines to be printed, you could use the XTDEREQC GLUE to alter the trigger level. Again, define the TDQ with a Trigger of zero and code up a XTDEREQC exit to detect the last line and alter the Trigger Level, to one - so starting the printing function.


This was last published in August 2002

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