>> I had a look in the three OS textbooks I have access to. One
>> followed your comments pretty much to the letter, one explained
>> that a one-way scan is normally used because it's easier to
>> program than a two-way scan, and the third states that a two-way
>> scan is normally used "in professional systems" because of its
>> higher efficiency.
> What about the age of those textbooks ?
Just checked - in the order I listed them above, they were published
in 1991, 1993 and 1996 respectively - which to me indicates that the
one-way elevator used to be the preferred system, but changes over the
years have made the two-way elevator preferred now...
Best wishes from Riley.
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