GIOS 6200 Spring 2021 Midterm Review

What roles and functionality does an operating system provide?

Threads can only exist on the kernel level

Which of the following are components of an operating system?

An operating system abstracts and arbitrates the use of the computer system.

Distributing memory between multiple processors is an example of abstraction.

Supporting different types of speakers is an example of abstraction.

What is an embedded operating system?

Check all UNIX based operating systems below.

Which of the following is an abstraction?

Which of the following is a mechanism?

To achieve it's goals an operating system supports a number of higher level abstractions and then a key number of mechanisms that operate on top of these abstractions.

Operating systems do not implement policies to determine how mechanisms will be used to manage the underlying hardware.

The policy Least Recently Used (LRU) decides that the pages that have been least recently used over a period of time are the ones that are no longer used in physical memory but instead to be used on disk. This is also known as

What are some good guiding policies when designing an OS? Check all that apply

To achieve it's role of controlling and managing hardware resources on behalf of applications, the application must have special privileges. This is achieved by distinguishing between at least two modes of

The operating system must operate in privileged kernel mode.

User - Kernel switch is supported by which hardware?

What is a trap instruction?

What happens when a trap instruction occurs?

A system call is when the operating system gives privileged access to an application. Examples of this are open(file), send(socket), and malloc(memory).