Instructions for the animation
In the animation of reader-writer problem, I represent the room to read and write as the critical section. For every critical section, doors play roles of semaphore. The explanation about matching algorithm and the animation is the following.
:
Readers
and
Writers
:
"wrt"
and
"mutex"
semaphore
The mapping algorithm to image is as follows:
: Readers and Writers 
: "wrt" and "mutex" semaphore 