ABSTRACT
Em bed ded sys tems are of ten time-crit i cal ap pli ca tions. Not only must the soft - ware en sure that events takes place, but also that they take place within a give time frame. As the num ber of si mul ta neous ac tiv i ties be comes larger, en sur ing the time li - ness of each ac tiv ity be comes more dif fi cult. In a sense, each ac tiv ity com petes for the CPU's at ten tion, and the soft ware de ter mines which one gets it at any given in - stant.
