Lecture 2 Introduction

What is an Operating System?

1. Referee

　　– Manage sharing of resources, Protection, Isolation

　　» Resource allocation, isolation, communication

2. Illusionist

　　– Provide clean, easy to use abstractions of physical resources

　　　　» Infinite memory, dedicated machine

　　　　» Higher level objects: files, users, messages

　　» Masking limitations, virtualization

3. Glue

　　– Common services

　　　　» Storage, Window system, Networking

　　　　» Sharing, Authorization

　　　　»Look and feel

Four fundamental OS concepts

1. Thread

　　– Single unique execution context

　　– Program Counter, Registers, Execution Flags, Stack

2. Address Space w/ Translation

　　– Programs execute in an address space that is distinct from the memory space of the physical machine

3. Process

　　– An instance of an executing program is a process consisting of an address space and one or more threads of control

4. Dual Mode operation/Protection

　　– Only the “system” has the ability to access certain resources

　　– The OS and the hardware are protected from user programs and user programs are isolated from one another by controlling the translation from program virtual addresses to machine physical addresses

ps: difference between threads 与 processes

　　- process encapsulate one or more threads sharing process resources

　　- Processes provides memory protection, threads more efficient than processes

Some other BIG OS Concepts

　　• Interrupt handlers (including syscall and trap)

　 • File System

　　　　– Integrates processes, users, cwd, protection

　　• Key Layers: OS Lib, Syscall, Subsystem, Driver
　　　　– User handler on OS descriptors
　　• Process control
　　　　– fork, wait, signal, exec
　　• Communication through sockets
　　• Client-Server Protocol

转载于:https://www.cnblogs.com/whuyt/p/4864075.html

Lecture 2 Introduction相关推荐

(To Learn More) ML Lecture 0-1: Introduction of Machine Learning
ML Lecture 0-1: Introduction of Machine Learning 视频链接:https://www.youtube.com/watch?v=CXgbekl66jc \q ...
Lecture 1:Introduction to Systems Analysis and Design
Lecture 1 PartA1: Introduction to Systems Analysis and Design 重点: PartA1: information technology inf ...
cs224 -Lecture 1:Introduction and Word Vectors
1.课程介绍了解有效的现代深度学习方法: - 首先回顾一些基础知识,然后介绍NLP中的关键方法:递归网络,注意力机制等: 了解人类语言的全貌,以及理解和产生语言的困难: 理解并有能力为NLP中的主要 ...
[1天搞懂深度学习] 读书笔记 lecture I:Introduction of deep learning
- 通常机器学习,目的是,找到一个函数,针对任何输入:语音,图片,文字,都能够自动输出正确的结果. - 而我们可以弄一个函数集合,这个集合针对同一个猫的图片的输入,可能有多种输出,比如猫,狗,猴子等, ...
Lecture 002-LP introduction
Outline •LP preliminaries •LP history •LP algorithms •LPstandard form ------------------------------ ...
CS269I：Incentives in Computer Science 学习笔记 Lecture 13：Introduction to Auctions（拍卖简介）
Lecture 13 Introduction to Auctions(拍卖简介) 1 Preamble(前言) 为什么计算机科学家要关心拍卖?直到最近(甚至可能仍然),提到拍卖,我们脑海中联想到的图 ...
[深度学习基础] 斯坦福CS231n李飞飞计算机视觉Lecture 1笔记
前言:目前做深度学习也有一段时间了,系统的知识也学了很多,但是大多数都是自己在网上所获得的零散的知识,最近看了李飞飞的斯坦福网上公开课,觉得可以好好的巩固一下基础,对每个Lecture做一下笔记,De ...
MIT 6.824 l01 Introduction
6.824 2020 Lecture 1: Introduction 6.824: Distributed Systems Engineering What is a distributed syst ...
『UC Berkeley CS267』Lesson1: Introduction and Overview
Lecture1 视频链接:CS267 (Sp22) - Lecture 1: Introduction and Overview - YouTube 不会完全记录课程内容,具体内容可以看知乎文章:U ...

Lecture 2 Introduction

Lecture 2 Introduction相关推荐

最新文章

热门文章