Type ASSEMBLE
Source Lines : 2,712
Fixes Applied : 20
Most Recent Version : Friday, February 2, 1979
Last Fix ID : [HRC106DK]
Module
DMKVSP
Function
TO HANDLE THE SIMULATION OF ALL USER SIO'S TO A VIRTUAL UNIT
RECORD DEVICE (CARD READER, PUNCH, PRINTER, OR PSEUDO
TIMER) THAT IS SPOOLED RATHER THAN DEDICATED. ALSO, TO
HANDLE CONTROL PROGRAM REQUESTS THAT WISH TO PRINT ON THE
USERS VIRTUAL PRINTER
Attributes
REENTRANT, RESIDENT, ENTERED VIA GOTO FROM DMKVIOEX
Operation
1. IF THE DEVICE IS CP BUSY (VDEVSVC=1): BAL TO
STKCPBLK ROUTINE TO BUILD AND STACK A CPEXBLOK
ON VSPSTK ANCHOR CHAIN TO DELAY THE REQUEST.
WHEN THE CPEXBLOK IS UNSTACKED CONTROL WILL BE
GIVEN TO ROUTINE AT LABEL RETCPEX.
MARK THE VIRTUAL DEVICE AND SUBCHANNEL BUSY, CLEAR THE
CSW AND SAVE THE STORAGE KEY; THEN, IF THE SIO IS TO
PSEUDO TIMER DEVICE, GO HANDLE THAT CASE; OTHERWISE,
CONTINUE
2. FOR SIO'S TO VIRTUAL READERS, PRINTERS AND PUNCHES, TEST
TO SEE IF A FILE IS ALREADY OPEN ON THE DEVICE; IF ONE IS
OPEN, BRANCH TO HANDLE THE PARTICULAR DEVICE TYPE,
OTHERWISE, GO OPEN THE FILE.
3. IF A FILE IS SUCCESFULLY OPENED, CONTINUE PROCESSING FOR
THE GIVEN DEVICE TYPE; OTHERWISE RETURN AN ERROR CON-
DITION TO THE USER
Calls to Other Routines
DMKPGTSG - TO OBTAIN DASD PAGE BUFFER SPACE
DMKRPAGT - TO READ A PAGE BUFFER INTO VIRTUAL MEMORY
DMKRPAPT - WRITE A BUFFER FROM VIRTUAL MEMORY TO DASD
DMKSCNVD - TO GET FULL VIRTUAL DEVICE ADDRESS
DMKSCNVU - TO LOCATE THE VCUBLOK AND VCHBLOK IN ORDER TO POST
ANY PENDING INTERRUPT AFTER INTERPRETATION IS COM-
PLETED
DMKSPLOV - TO OPEN A NEW DASD OUTPUT SPOOL FILE
DMKSPLCV - TO CLOSE A NEW DASD OUTPUT SPOOL FILE
DMKSPLDL - TO PURGE A PARTIALLY COMPLETE FILE
DMKSTKCP - TO QUEUE A CP EXEC BLOK
DMKCVTBH - CONVERT DEVICE ADDRESS FOR ERROR MESSAGES
DMKTMRPT - TO GET USER'S TOTAL PROBLEM TIME USED
DMKERMSG - TO WRITE ERROR MESSAGES
DMKPGTVR - TO RELEASE VIRTUAL BUFFER
DMKPGTVG - TO GET A VIRTUAL BUFFER
DMKPSASC - CHECK IF CCW'S ARE WRITTING INTO A SHARED PAGE
DMKPSACC - TO TEST IF A SHARED PAGE WAS CHANGED BY RUNUSER
DMKVMAPS - TO UNSHARE A NAMED SYSTEM FROM RUNUSER
DMKFREE, DMKFRET, DMKQCNWT, AND DMKCVTDT FOR THE USUAL REASONS
DMKCKSPL - CHECKPOINT THE SFBLOK