winscape 2318

To relate this EXACT topic to one near and dear to Barb's heart, Tom Hastings' name appears on both the CTSS scheduler, and on the one in CLKCSS.MAC of the PDP-6-10 Time Sharing Monitor (the software later known as TOPS-10).

see

in ctss-listings.zip file mitc8c0, near line 8900 (search for SCDA)

************* TIME SHARING SCHEDULING ALGORITHM ************* 07-22-70 1321.5 PAGE 1 * T. HASTINGS AND R. DALEY * * MINOR MODIFICATIONS BY G. SCHROEDER WHEN NEW * I-O PACKAGE INSTALLED....SUMMER,1965. * MINOR CHANGES FOR NEW COMMAND PROCESSOR * SPRING 1968 plus 1 ...... P.R. BOS * * THE SCHEDULING ALGORITHM PERFORMS THE FOLLOWING FUNCTIONS * * 1. DETERMINES WHICH USER IS TO RUN NEXT * 2. DETERMINES WHEN NEXT USER IS TO RUN * 3. DETERMINES HOW LONG NEXT USER IS TO RUN * 4. CHARGES USERS FOR SWAPPING AND RUNNING TIME * 5. KEEPS TRACK OF THE STATUS OF EACH USER * * THE SCHEDULING ALGORITHM IS CALLED FROM THE SUPERVISOR BY * EXECUTE SCHED. (EVENT, USER, ARG) * AFTER ALL TRAPS HAVE BEEN DISABLED

and

(This is a modified version part of a DECUS submission for "PDP-8-PDP-10 REAL TIME DATA ACQUISITION SYSTEM", author: Peter M. Hurley).

breastLE CLKCSS - SCHEDULING ALGORITHM FOR NON-SWAPPING SYSTEMS SUBTTL T. HASTINGS-TH TS3.17 6 SEP 67 V001 XP VCLKCS,001 ;PUT VERSION NUMBER IN GLOB LISTING AND LOADER STORAGE MAP

;SCHEDULING ALGORITHM IS: ;CALLED EVERY 60TH OF A SECOND WHEN CURRENT JOB IS USER MODE ;CALLED WHEN CURRENT JOB IS IN EXEC MODE AND: ; 1. JUST STARTED TO WAIT FOR IO ; 2. JUST STARTED TO WAIT FOR A BUSY SHARABLE DEVICE ; 3. RETURNING TO USER MODE AFTER TYPING CONTROL C ; 4. RETURNING TO USER MODE AFTER CLOCK TRIED TO INTERRUPT ; CURRENT JOB WHILE IT WAS IN EXEC MODE ; 5. AN ERROR OCCURRED IN CURRENT JOB