Differentiate between the following by providing a distingui

Differentiate between the following by providing a distinguishable definition for each:

a. Periodic task of a real time system

b. Non-periodic/Aperiodic task of a real time system

c. Sporadic task of a real time system

Solution

a) Periodic task of a real time system:

Periodic tasks execute their invocations within the selected regular time intervals.

Example: task T(P) that is characterize by its worst case execution time and the period with relative deadline . Now that the k th invocation of T(P) is characterize by its first start time and relative deadline

b) Aperiodic task of a real time system:

The aperiodic tasks are invoked only once. Their individual arrival times are unknown at the design time.

Example: T(A) has the arrival time and worst case execution time and relative deadline as the parameters.

c) Sporadic task of a real time system:

These tasks can arrive at the system at random points or even at the different point in time Example: a sporadic task T(S) is characterizing by its relative deadline and minimum inter arrival time and worst case execution time.