Term
| What is an operating system responsible for? (4 points) |
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Definition
| 1 task creation, management and scheduling 2 interrupt servicing 3 communication and synchronization between tasks 4 memory management |
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Term
| What is a Kernel and what does it consist of? |
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Definition
A minimal set of supervisory SW for task scheduling and resource
management.
It consists of a scheduler, kernel objects, and services. |
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Term
| What does the scheduler do? |
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Definition
| It provides algorithms to determines which task executes when. |
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Term
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Definition
In this course, task is used as a generic name for either a process
or a thread. |
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Term
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Definition
| A normal unit of execution in an OS. |
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Term
| What does an OS provide to each process? |
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Definition
| Memory page, CPU registers, queues, kernel objects, and a PCB (process control block) |
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Term
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Definition
| Process Control Block is an abstraction of a process consisting of: ID of the process, CPU registers, process state, address space mapping details, stack pointers, and resources allocated and needed. |
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Term
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Definition
| A lightweight process share address space but has it's own PC, register sets, and stacks. |
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Term
| Name a few pros and cons of threading. |
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Definition
Pros: foreground and background processing, asynchronous processing, modular program structure
Cons: Additional overhead, programming discipline, and difficulty in debugging. |
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Term
| What does a context switch do? |
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Definition
| It saves the currently running task before another task can be executed during multitasking. |
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