04-11-2006
dsberrf has a valid point, this would be a lengthy chapter in a book. Another point is that different kernels has different algorithms for scheduling. But briefly, the "clock" is a component that generates periodic interrupts. The interrupt routine does stuff when it is called by the clock. A major routine is called a certain number of times per second with 100 times per second being a common value. This major routine is called a "clock tick" (or "jiffy" on linux). A process' timeslice might be one tenth of a second so this would be represented as a 10. The timeslice is always some fixed number of "clock ticks". At each clock tick, it is decremented. When it hits zero, the scheduler will decide which process gets the cpu. If no other process wants the cpu, the process might get another timeslice.
There is a lot more to this, but I'm not going to write that lengthy chapter...
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LEARN ABOUT DEBIAN
oclock
OCLOCK(1) General Commands Manual OCLOCK(1)
NAME
oclock - round X clock
SYNOPSIS
oclock [-option ... ]
DESCRIPTION
Oclock simply displays the current time on an analog display.
OPTIONS
-fg color
choose a different color for the both hands and the jewel of the clock
-bg color
choose a different color for the background.
-jewel color
choose a different color for the jewel on the clock.
-minute color
choose a different color for the minute hand of the clock.
-hour color
choose a different color for the hour hand of the clock.
-backing { WhenMapped Always NotUseful }
selects an appropriate level of backing store.
-geometry geometry
define the initial window geometry; see X(7).
-display display
specify the display to use; see X(7).
-bd color
choose a different color for the window border.
-bw width
choose a different width for the window border. As the Clock widget changes its border around quite a bit, this is most usefully
set to zero.
-shape causes the clock to use the Shape extension to create an oval window. This is the default unless the shapeWindow resource is set
to false.
-noshape
causes the clock to not reshape itself and ancestors to exactly fit the outline of the clock.
-transparent
causes the clock to consist only of the jewel, the hands, and the border.
COLORS
If you would like your clock to be viewable in color, include the following in the #ifdef COLOR section you read with xrdb:
*customization: -color
This will cause oclock to pick up the colors in the app-defaults color customization file: /usr/lib/X11/app-defaults/Clock-color. Below
are the default colors:
Clock*Background: grey
Clock*BorderColor: light blue
Clock*hour: yellow
Clock*jewel: yellow
Clock*minute: yellow
SEE ALSO
X(7), X Toolkit documentation
AUTHOR
Keith Packard, MIT X Consortium
X Version 11 oclock 1.0.3 OCLOCK(1)