This demos will create shared memory. As the user
space program is using the shared memory, the rt_task
will interrupt the user space program when it accesses
the shared memory causing the user space memory to
print an output. 

Do the following to run the demo:
(You must be a superuser while running these commands)
-----------------------------------------------------------------
> ./configure
> make
> ./instrl
> ch ./shm_app.c
> ./rmrtl


To exit the running shm_app.c, use <CTRL-c>
