Questions and Answers
Which of the following best describes a process?
An abstraction of a running program
What is the main difference between a process and a thread?
A process is a member of system-level multitasking, while a thread is a member of process-level multitasking
What does a private data structure of a process typically contain?
Identity, priority level, state of execution, and resources
In what type of operating systems are processes and threads commonly available?
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How are multiple threads within the same process related to each other?
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Which type of system commonly implements polled loops as a background task?
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When are polled loops commonly used in a cyclic code structure?
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What is a variation of the polled loop that uses a fixed clock interrupt?
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What is contact bounce?
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In what type of systems are interrupt-driven systems and cyclic code structures discussed?
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Which type of system commonly implements polled loops as a background task?
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What is a variation of the polled loop that uses a fixed clock interrupt?
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When are polled loops commonly used in a cyclic code structure?
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What is contact bounce?
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In what case does the polled loop poll each cycle for a finite number of times?
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Study Notes
Processes and Threads
- A process is best described as a program in execution, including current activity, memory, and system resources.
- The main difference between a process and a thread is that processes have separate memory spaces, while threads share memory space within a process.
Process Data Structure
- A private data structure of a process typically contains the program counter, stack, and memory allocation.
Operating Systems
- Processes and threads are commonly available in modern, multi-user, and multi-tasking operating systems.
Threads Relationship
- Multiple threads within the same process are related to each other by sharing memory space and system resources.
Polled Loops
- Polled loops are commonly used in real-time systems as a background task.
- Polled loops are used in cyclic code structures to continuously check for a specific condition or event.
- A variation of the polled loop that uses a fixed clock interrupt is called a clock-driven loop.
Interrupt-Driven Systems
- Interrupt-driven systems and cyclic code structures are discussed in real-time systems.
Contact Bounce
- Contact bounce refers to the mechanical rebound effect of a switch or button when pressed, causing multiple signals to be sent.
Polled Loop Variations
- In some cases, a polled loop polls each cycle for a finite number of times, known as a timeout.
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