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- There is one independent thread for each shape
- Active threads are pulsating
- From time to time, a ring shape wants to become a
reader for a while and add a triangle in the center
of its ring
- From time to time, a ring shape wants to become a
writer for a while and add a square in the center
of its ring
- However, there can be at most one writer at a time and
there cannot be readers and writers at the same time
- A shape that is waiting to become a reader/writer freezes
and stops pulsating
- Left click on a pulsating ring shape forces it
to request a change into a reader
- Right click on a pulsating ring shape forces it
to request a change into a writer
- To click on a reader/writer forces it to turn
back into a simple ring shape
- To click on a frozen shape does nothing
- A middle-button click rearranges shapes randomly
(Mouse functions require Java 1.4.)
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Last modified: Mon Dec 10 13:06:42 EST 2007