Type ASSEMBLE
Source Lines : 1,735
Fixes Applied : 5
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [HRC066DK]
Module
DMKSCH
Function
TO MAINTAIN QUEUES OF RUNNABLE AND ELIGIBLE USERS, TO ALTER
USERS DISPATCHING STATUS, AND TO PERIODICALLY RECALCULATE
USERS WORKING SET AND DISPATCHING PRIORITY, AND TO MAINTAIN
STATISTICS ON UTILIZATION AND CONTENTION FOR MAJOR RESOURCES
DMKSCH ALSO CONTAINS THE ROUTINES THAT MAINTAIN THE SYSTEM TOD
CLOCK COMPARATOR REQUEST QUEUE AND THE CODE THAT MONITORS FAV-
ORED EXECUTION USERS
Attributes
SERIALLY REUSABLE, RESIDENT, CALLED VIA BALR
Operation
A. MAIN STATUS CHANGE MAINTENANCE
1. STAMP/UNSTAMP USER'S "REAL" TIMER(S)
2. IF USER IS RUNNABLE, SKIP TO STEP 6.
3. IF USER WAS RUNNABLE BEFORE, MARK NOT RUNNABLE
IF IN ELIGIBLE LIST DROP FROM LIST.
4. IF USER IS IN AN IDLE WAIT STATE, DROP FROM Q
5. GO TO SECTION B TO LOOK FOR ELIGIBLE USERS TO ADD TO Q
6. IF USER IS RUNNABLE, MARK IT RUNNABLE.
7. IF USER WAS RUNNABLE BUT NOT IN Q BEFORE, GO TO SECTION
B TO LOOK FOR USERS TO ADD TO Q
8. IF USER WAS NOT RUNNABLE BEFORE, ADD TO APPROPRIATE RUN-
NABLE LIST
9. IF USER'S TIME SLICE HAS BEEN EXCEEDED, DROP FROM Q
10. IF USER HAS GONE COMPUTE BOUND, DROP TO LOW PRIORITY
11. GO TO SECTION B
Calls to Other Routines
DMKMIDNT - CALLED TO ALTER DATE AT MIDNIGHT
DMKFRET - TO RELEASE STORAGE
DMKQCNWT - TO WRITE OVERLOAD DIAGNOSTICS TO OPERATOR.
DMKPTRRS COUNT REF. PAGES AND ADD TO FLUSH LIST
DMKLOKSP - TO OBTAIN SPIN LOCKS