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| subject: | WaitForMessage(); |
JdBP> Secondary thread 3 :
JdBP> for (;;) {
JdBP> DosSleep(1000) ;
JdBP> update_clock_display () ;
JdBP> }
JdBP> ( Incidentally, Peter Fitzsimmons will tell you
JdBP> that you can also page
JdBP> tune the program by putting the inner loops of the threads as close
JdBP> together as possible, reducing the working set
JdBP> of an idle process. )
Actually, before I started pointing that out, i'd COMPLAIN about the
existence of "thread 3" -- there's no need for any application --
unless it is THE clock application -- to display a clock. This stupid
& unnecessary feature will prevent the program from being swapped out
(or will create swapping activity every second on an overcommitted
system),when the program really doesn't have anything useful to do.
Pete's new application rule #1: An application should only use CPU
cycles as a direct result of activity
from a device (keyb, mouse, modem, for
example).
Exception to rule #1: Scheduled events (For example, a backup
program). Before the event, the program is
blocked.
You are breaking rule #1 if: You are asking (polling) a device to
see if anything has happened since the
last time you polled it.
You are breaking rule #1 if: You have to place a DosSleep() in your
program to prevent "Pulse" from staying
anywhere near 100%.
If you (not Jon de BP:-) are reading this, and can't figure out a way to
abide by this rule, tell us what you are doing and we'll fix it for you!
--- Maximus/2 2.02p1
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