RTL scheduler

Hi,
   I am new to the world of RTLinux and I was wondering if anyone
could point me to some comprehensive tutorial on RTLinux scheduler. I
am trying to figure out how RTLinux scheduler deals with the deadline.
For example, let us consider that we are running a real-time
application which will read data from a port at each 100 micros. That
means if that code starts at time t1, it'll have to finish before
t1+100 and have to be scheduled to run again at t1+100.

   What happens if it can't finish before t1+100? At that point
there'll be new set of data on the port to be read while the old data
is still being read by real-time application. Does RTLinux stops the
currently executing application and does a fresh start for the new set
of data? I was doing some research regarding scheduling in real-time
systems. I used QNX before. I know that QNX works that way ( stops old
process which is not finished within deadline and starts a new
process).

   Any input on this will be highly appreciated.

thanks,
santanu
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