Operating System

来源 Modern Operating System

Abstractions 抽象

抽象是计算机科学中最为重要的概念之一.

来源 Computer System, Figure 1.18

• Process 进程

  A process is the operating system’s abstraction for a running program.

• Virtual Memory 虚拟内存

  Virtual memory is an abstraction that provides each process with the illusion that it has exclusive use of the main memory

  虚拟内存为每个进程提供了一个假象: 每个进程独占主存, 每个进程看到的内存是一致的; 的基本思路是把一个进程的虚拟内存存储在磁盘上, 然后用主存作为磁盘的高速缓存.

• File 文件

  文件是对 IO 设备的抽象

  A file is a sequence of bytes, nothing more and nothing less. Every I/O device, including disks, keyboards, displays, and even networks, is modeled as a file.

• [Virtual Machine 虚拟机]

  虚拟机

Case Study

• Unix

• Linux

• Windows

Further Readings

Books

• Modern Operating System 现代操作系统

• Computer System - A programmer’s perspective

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Lectures

• Hints for Computer System Design

• On Building Systems that Will Fail

• End-to-End Arguments in System Designs