Type ASSEMBLE
Source Lines : 1,476
Fixes Applied : 3
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [HRC106DK]
Module
DMKPGT
Function
TO ALLOCATE A PAGE OF DASD SPACE THAT IS TO BE USED FOR EITHER
VIRTUAL MEMORY PAGING OR FOR SPOOL FILE PAGE BUFFERS
Attributes
SERIALLY REUSABLE, RESIDENT, CALLED VIA BALR
Operation
1. POINT TO FIRST DEVICE TYPE ANCHOR FOR OWNED DEVICES
2. LOCATE THE RDEVBLOK FOR THE NEXT DEVICE WITH TEMPSPACE
ALLOCATED ON IT
3. POINT TO THE PROPER RECBLOK ANCHOR (FOR EITHER PAGING OR
SPOOLING) AND LOCATE THE FIRST RECBLOK WITH AN AVAIL-
BLE PAGE. IF A RECBLOK IS FOUND, GO TO STEP 6
4. IF NO ALLOCATED CYLINDER HAS AN AVAILABLE PAGE, LOCATE THE
THE NEXT AVAILABLE CYLINDER, WORKING OUTWARD FROM THE
CENTER OF THE TEMPSPACE AREA. IF NO CYLINDER IS AVAILABLE,
GO TO STEP 2; OTHERWISE, CONTINUE
5. CONSTRUCT A NEW RECBLOK FOR THE ALLOCATED CYLINDER, AND
CHAIN IT TO THE END OF THE CURRENT CHAIN
6. CALCULATE THE ADDRESS OF THE ALLOCATED PAGE, MARK IT AS
ALLOCATED, AND PASS THE ADDRESS BACK TO THE CALLER