In the event-based model, a task is defined as a stream of requests
(called jobs, or task's instances) for a shared resource (the CPU).
Each job is characterized by:
a computation time c,
a request time r,
an absolute deadline d
Tasks are scheduled according to their temporal requirements: for example,
the priority of a task can be proportional to the job's deadline (EDF priority
assignment - dynamic priorities), or to the task's period (RM priority
assignment - fixed priorities).
