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Questions and Answers
What are the three main purposes of an operating system?
What are the three main purposes of an operating system?
When is it appropriate for the operating system to forsake the principle of making efficient use of computing hardware?
When is it appropriate for the operating system to forsake the principle of making efficient use of computing hardware?
What is the main difficulty that a programmer must overcome in writing an operating system for a real-time environment?
What is the main difficulty that a programmer must overcome in writing an operating system for a real-time environment?
What is the role of an operating system in managing I/O devices?
What is the role of an operating system in managing I/O devices?
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Which of the following is a key consideration for real-time operating systems?
Which of the following is a key consideration for real-time operating systems?
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What is the argument against including web browsers and mail programs as part of the OS?
What is the argument against including web browsers and mail programs as part of the OS?
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What does the kernel mode and user mode distinction provide?
What does the kernel mode and user mode distinction provide?
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Which of the following is an example of a privileged instruction?
Which of the following is an example of a privileged instruction?
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What issue is highlighted with memory protection by placing the OS in a separate partition?
What issue is highlighted with memory protection by placing the OS in a separate partition?
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What does the client-server model involve?
What does the client-server model involve?
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How is current time computation achieved using timer interrupts?
How is current time computation achieved using timer interrupts?
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Study Notes
- Operating system (OS) for real-time systems requires scheduling schemes that don't exceed response time constraints.
- Debate on whether applications like web browsers and mail programs should be part of OS or not.
- Argument for: Embedded applications have performance advantages as they can utilize features in the OS kernel.
- Argument against: Applications are distinct from OS; performance benefits are offset by security vulnerabilities; leads to a bloated OS.
- Kernel mode and user mode distinction provides rudimentary security by limiting CPU capabilities in user mode and enforcing protection of critical resources.
- Privileged instructions: setting timer value, clearing memory, turning off interrupts, modifying device-status table, accessing I/O device.
- powermemory.png issue with memory protection by placing OS in a separate partition: unprotected memory exposes sensitive data to unauthorized users.
- Multiple modes of operation: provides finer-grained security or allows specific modes for different types of user code or kernel functions.
- Current time computation using timer interrupts: a program sets a timer, sleeps, and updates local state when interrupted.
- Caches: solve transfer problems between components, but require consistent data and cause issues on multiprocessor systems.
- Client-server model: distinct roles - clients request services from servers, while peer-to-peer model: no strict roles - all nodes have equal capabilities.
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Description
Test your knowledge of the three main purposes of an operating system with this quiz. Understand the essential functions of an operating system such as providing a user-friendly environment for program execution, efficient allocation of resources, and control program supervision.
