Real Time Systems

Question 1

What is a hard real time system?

Answer 1

A late result results in system failure

Question 2

What is a weakly hard real time system?

Answer 2

A late result is useless but a proportion of results can be late before the system fails

Question 3

What is a firm real time system?

Answer 3

A late result causes a loss in quality

Question 4

What is a soft real time system?

Answer 4

A late result is less useful than an on time result

Question 5

What does a real time operating system focus on?

Answer 5

Fast switching between tasks
Fast interrupt handling
Predictable response time
Making intelligent switching choices

Question 6

What is static priority scheduling?

Answer 6

Priorities are fixed

Question 7

What is dynamic priority scheduling?

Answer 7

Priorities change throughout execution. The task with the earliest deadline has the highest priority.

Question 8

What is monotone scheduling?

Answer 8

Provides conditions that guarantee a schedule