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Questions and Answers
Which type of time deals with a quantitative notion of time measured using a physical clock?
Which type of time deals with a quantitative notion of time measured using a physical clock?
- Logical time
- Virtual time
- Real time (correct)
- System time
What kind of time is expressed using terms like 'before,' 'after,' 'sometimes,' and 'eventually'?
What kind of time is expressed using terms like 'before,' 'after,' 'sometimes,' and 'eventually'?
- Virtual time
- Logical time (correct)
- System time
- Real time
In a real-time system, what must occur during the evolution of external events?
In a real-time system, what must occur during the evolution of external events?
- System time synchronization
- Reactions (correct)
- Controlled environment measurement
- Quantitative measurement
How is system time measured in relation to the external environment in a real-time system?
How is system time measured in relation to the external environment in a real-time system?
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When is a system considered a real-time system?
When is a system considered a real-time system?
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Study Notes
Real Time and Logical Time
- Real Time is a quantitative notion of time measured using a physical clock.
- Example of Real Time: after a certain event occurs (temperature exceeds 250°C), the corresponding action (coolant shower) must complete within 100 mSec.
- Real Time indicates reaction to external events must occur during their evolution.
System Time
- System Time (internal time) has to be measured with the same time scale as the controlled environment (external environment).
Real-Time System
- A system can be called a real-time system when quantitative time is used to describe the behavior of the system.
Logical Time
- Logical Time (aka Virtual Time) deals with a qualitative notion of time.
- Example of Logical Time: expressed as ‘before’, ‘after’, ‘sometimes’, ‘eventually’, etc.
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