7 lines
3.6 KiB
Plaintext
7 lines
3.6 KiB
Plaintext
en·vÅos PREEMPTIVE
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PREEMPTIVE
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By: Larry Masinter (Masinter.pa@Xerox.com)
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This module turns on pre-emptive process scheduling. Using IL:\\PERIODIC.INTERRUPT, it forces a block in whatever process is running.
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(IL:PREEMPTIVE &OPTIONAL STATE) [Function]
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The function PREEMPTIVE turns preemptive process scheduling on and off. (IL:PREEMPTIVE ':ON) turns it on, (IL:PREEMPTIVE ':OFF) turns it off. (IL:PREEMPTIVE) with no argument returns the current state with no change.
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WARNING WARNING WARNING WARNING DANGER DANGER DANGER DANGER
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PREEMPTIVE is dangerous. Many places in the system do not have monitor locks and other mechanisms to prevent one process from overwriting the data of another in the face of preemptive interrupts. (Most do, of course.)
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I've run with preemptive scheduling turned on for weeks, and about once a day, my screen gets trashed, windows and menus overwritten, etc. This version of PREEMPTIVE is a little more conservative than previous versions, e.g., it checks to see if the system is running in the MENU code and doesn't do a process switch. However:
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USE AT YOUR OWN RISK. CAUTION CAUTION.
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NOTE: Using SPY turns preemptive scheduling OFF. (LIST ((PAGE NIL (PAPERSIZE LETTER FOLIOINFO (ARABIC "" "") STARTINGPAGE# 202) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY MODERN OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO (ARABIC "" "")) (174 36 288 36) NIL) (HEADING NIL (HEADINGTYPE RUNNINGHEAD) (84 744 528 36) NIL) (TEXT NIL NIL (84 96 456 600) NIL))) (PAGE NIL (PAPERSIZE NIL . LETTER) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY MODERN OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO NIL) (174 36 288 36) NIL) (HEADING NIL (HEADINGTYPE RUNNINGHEAD) (84 744 528 36) NIL) (TEXT NIL NIL (84 96 456 600) NIL))) (PAGE NIL (PAPERSIZE NIL . LETTER) (0 0 612 792) ((FOLIO NIL (PARALOOKS (QUAD CENTERED) CHARLOOKS (SUPERSCRIPT 0 INVISIBLE OFF SELECTPOINT OFF PROTECTED OFF SIZE 10 FAMILY MODERN OVERLINE OFF STRIKEOUT OFF UNDERLINE OFF EXPANSION REGULAR SLOPE REGULAR WEIGHT MEDIUM INVERTED OFF USERINFO NIL STYLE NIL) FORMATINFO NIL) (174 36 288 36) NIL) (HEADING NIL (HEADINGTYPE RUNNINGHEAD) (84 744 528 36) NIL) (TEXT NIL NIL (84 96 456 600) NIL))))) - È T - È T 3 È È T , È , È , È , Š Š8 , Š Š8 H È È PAGEHEADING RUNNINGHEAD CLASSIC CLASSIC CLASSIC MODERN
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MODERN
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MODERN MODERN
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MODERN HRULE.GETFN MODERN
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HRULE.GETFN MODERN
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HRULE.GETFN MODERN
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HRULE.GETFN MODERN HRULE.GETFN MODERN , †
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Ù < Û G ' 0 ˜ ,zº |