Partial application in C

[00704a-Liber]

[followups to comp.os.misc]

In article <291 at ns.nsc.com> ddb at ns.nsc.com (David Dyer-Bennet) writes:
|In article <3950006 at hplvly.HP.COM>, boyne at hplvly.HP.COM (Art Boyne) writes:
|> ...on virtual memory machines,
|> ...Having
|> unmodifiable code segments therefore reduces disk activity.
|  No, it's whether the code segments *ACTUALLY ARE* modified that should
|control disk activity; any decent virtual memory system must be able to 
|determine if a writable page has actually been written!  So, truly pure
|code does reduce paging, but the ABILITY to have impure code shouldn't
|cost anything unless it's used.

It still does, however.  If an executing code segment is restricted to being
unmodifiable, then it NEVER has to be written out to disk.

If an executing code segment is modifiable, then a slightly more complex
paging scheme needs to be used.  It can be done, but not without cost.
-- 
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