Interruption within S-function

Hi ,

I am looking for a way to create several interruption in a S-function.

For the moment I use Mex file sample times which able me to call my function every X time. But there is no priority when I use this method.

What I would like to do is to create 3 interruptions to interrupt my C code: One at 125µs , one at 250µs and one with a variable time which could be modified during the simulink simulation.

Hope someone can answer.