Essays

1619 words - 7 pages

Module 3: Operating-System Structures

System Components

Operating System Services

System Calls

System Programs

System Structure

Virtual Machines

System Design and Implementation

System Generation

Common System Components

Process Management

Main Memory Management

Secondary-Storage Management

I/O System Management

File Management

Protection System

Networking

Command-Interpreter System

Process Management

A process is a program in execution. A process needs certain resources, including CPU time, memory, files, and I/O devices, to accomplish its task.

The operating system is ...view middle of the document...

The operating system is responsible for the following activities in connection with disk management:

Free space management

Storage allocation

Disk scheduling

I/O System Management

The I/O system consists of:

A buffer-caching system

A general device-driver interface

Drivers for specific hardware devices

File Management

A file is a collection of related information defined by its creator. Commonly, files represent programs (both source and object forms) and data.

The operating system is responsible for the following activities in connections with file management:

File creation and deletion.

Directory creation and deletion.

Support of primitives for manipulating files and directories.

Mapping files onto secondary storage.

File backup on stable (nonvolatile) storage media.

Protection System

Protection refers to a mechanism for controlling access by programs, processes, or users to both system and user resources.

The protection mechanism must:

distinguish between authorized and unauthorized usage.

specify the controls to be imposed. //定義法律

provide a means of enforcement. //執行法律

Networking (Distributed Systems)

A distributed system is a collection processors that do not share memory or a clock. Each processor has its own local memory.

The processors in the system are connected through a communication network.

A distributed system provides user access to various system resources.

Access to a shared resource allows:

Computation speed-up

Increased data availability

Enhanced reliability

Command-Interpreter System

Many commands are given to the operating system by control statements which deal with:

process creation and management

I/O handling

secondary-storage management

main-memory management

file-system access

protection

networking

Command-Interpreter System (Cont.)

The program that reads and interprets control statements is called variously:

control-card interpreter

command-line interpreter

shell (in UNIX)

Its function is to get and execute the next command statement.

Operating System Services

Program execution – system capability to load a program into memory and to run it.

I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O.

File-system manipulation – program capability to read, write, create, and delete files.

Communications – exchange of information between processes executing either on the same computer or on different systems tied together by a network. Implemented via shared memory or message passing.

Error detection – ensure correct computing by detecting errors in the CPU and...

Other assignments on Essays

Religion Veil - Uk Essays

397 words - 2 pages Muslim scholars argue that both male and female faithful ought to maintain modest dress. This kind of dressing entails covering the area between the navel and the knee, as well as wearing of silk by men. On the other hand, female dressing has caused controversy for a long time with some believing that the hands and face must ordinarily appear during the day, and the exposure of the full face is not required. In Quran versus, Muhammad instructs

Essays For Stipend

890 words - 4 pages Essay #1 ( One objective of the state stipend program is to recruit students who know and understand the underserved communities served by the public mental health system. Explain how you meet this objective) I understand the struggle underserve communities, such as minorities face because I am part of that population. I grew up in a poor neighborhood were resources were limited and we struggle to get access to government health agencies. There

Essays Of College Assurance Plan

1626 words - 7 pages Table of Contents A. OJT DOCUMENTATION I. Introduction i. Importance of the Plant Practice ii. Objectives iii. Place and Duration of the Plant Practice II. Nature of the Company i. History III. Plant Details i. Plant Location and Description ii. Mode of Operation iii. Plant lay-out Map IV. Processing Operation/Nature of Activities i. Equipment used in the assigned area V

Exam 3 Essays - Mgt 314

664 words - 3 pages Management 314 Exam 3: Essay Question Due: 11 December 2014 Essay 1: Equity theory is based on the notion that individuals compare their inputs and outcomes with those of relevant others. If inequity is apparent based on the ratios, tension is created amongst individuals and one individual will be motivated to reduce the inequity by working less hard. One of the most important types of equity for compensation is internal equity, which

My Essays For My French Test

447 words - 2 pages Friendship is one of the feelings in the world * Pour moi, l’amitié est très importante. * Je me souviens d’avoir lu quelque part « Tout le monde entend ce que tu dis; tes amis écoutent ce que tu dis; mais tes meilleurs amis découvrent ce que tu ne dis pas. » * J’ai deux ou trois amis que je connais depuis l’école primaire et on se voit tout le temps. * On se connaît très bien, on se dit tout sur notre vie sentimentale

Benefast

265 words - 2 pages "Essays" redirects here. For other uses, see Essays (disambiguation). John Locke's 1690 Essay Concerning Human Understanding. An essay is a piece of writing which is often written from an author's personal point of view. Essays can consist of a number of elements, including: literary criticism, political manifestos, learned arguments, observations of daily life, recollections, and reflections of the author. The definition of an essay is

Essay Style

444 words - 2 pages Welcome to Writing Essays, the RLF’s online guide to everything you wanted to know but were afraid to ask about writing undergraduate essays. The guide is a toolbox of essay writing skills and resources that you can choose from to suit your particular needs. It combines descriptive and practical elements. That is, it tells you what things mean and what they are; and it uses examples to show you how they work. Writing Essays takes you

What Is An Essay?

815 words - 4 pages An essay is a piece of writing which is often written from an author's personal point of view. Essays can consist of a number of elements, including: literary criticism, political manifestos, learned arguments, observations of daily life, recollections, and reflections of the author. The definition of an essay is vague, overlapping with those of an article and a short story. Almost all modern essays are written in prose, but works in verse have

Characteristics Pf Expository Essay

1032 words - 5 pages Axia College Material Characteristics of the Expository Essay What Is an Essay? An essay, or personal-opinion paper, is an important part of your college experience because it requires critical thinking as well as organization and research. Essay is a broad term. Sometimes an essay is just a page long; sometimes, essays are five pages or longer. Essays, however, focus on a single subject and idea. They also have different purposes: to

Review Of A Time To Kill

676 words - 3 pages Search Type in your essay topic: ex. Vietnam War JOIN LOGIN CUSTOM ESSAYS HELP CONTACT A time to kill Essay Below is a free essay on "A time to kill" from Anti Essays, your source for free research papers, essays, and term paper examples. “JUSTICE CAN BE COLOR BLIND” “A Time to Kill” takes place in a small Mississippi town, where two white Men kidnap, rape, and nearly beat to death a young black girl. The men are caught, but the

Researchblower

633 words - 3 pages Below is a free essay on "Whistleblowing" from Anti Essays, your source for free research papers, essays, and term paper examples. Whistleblowing is a highly controversial and widely discussed topic in today’s society due to many high profile cases including the circumstances surrounding the Space Shuttle Challenger explosion and what was documented in the movie The Insider about the tobacco industry. Ethically, the decision for someone to

Similar Documents

Essays

1007 words - 5 pages is controversial. Proponents argue that it teaches students how to organize their thoughts clearly in writing; opponents characterize its structure as rigid and repetitive. [edit] Academic essays Longer academic essays (often with a word limit of between 2,000 and 5,000 words) are often more discursive. They sometimes begin with a short summary analysis of what has previously been written on a topic, which is often called a literature review

2 Essays

519 words - 3 pages destructive. This mood is learning for children to obtain directives, carry on a reliable tempo and effort with other people. It pushes up children to get pleasure from developing music and pays attention to music. (Sanwick, 1988). Reference: http://www.ukessays.com/essays/young-people/the-creativity-and-imagination-children-and-young-people-essay.php#ixzz3z2grop1R

Essays

1665 words - 7 pages Binary Decimal Octal and Hexadecimal number systems A number can be represented with different base values. We are familiar with the numbers in the base 10 (known as decimal numbers), with digits taking values 0,1,2,…,8,9. A computer uses a Binary number system which has a base 2 and digits can have only TWO values: 0 and 1. A decimal number with a few digits can be expressed in binary form using a large number of digits. Thus the number 65

Stylistic Analysis Of Various Types Of Essays

2587 words - 11 pages STYLISTIC ANALYSIS OF VARIOUS TYPES OF ESSAYS In this chapter we describe different forms and styles of essay writing. These forms and styles are used by a range of authors, including university students and professional essayists. To characterize the peculiar features of the admission essay we would like to make stylistic analyses of an article. App. 1] The beginning of an essay, paragraph 1, is essential to making