The notes🌏

学习操作系统的笔记，探究Linux的内核

所有的博客排布大致与上课的进度相同，但会与linux的开源内核代码结合，并梳理清代码和整个系统之间的关系

Overview

• Batch Processing System

  jobs在内存外或者外存里，内存始终有一个job在运行，操作系统负责在结束后加载下一个，在IO时停止运行

• Multiprogramming Batch System

  在上一个的基础上，当前job发生IO时，运行另一个job

• Time Sharing System

  各个job轮转运行

现代操作系统都是中断驱动

在中断时，保存和恢复现场状态的过程时不应当被打断的

但低级中断会被高级中断中断

系统调用的功能包括：

• Process control
  • create, terminate
  • load, execute
  • get process attributes, set process attributes
  • wait event, signal event
  • allocate and free memory
• File management
  • create, delete
  • open, close
  • read, write, reposition
  • get file attributes, set file attributes
• Device management
  • request device, release device
  • read, write, reposition
  • get deviece attributes, set device sttributes
  • logically attach or detach device
• Information maintenance
  • get or settime or date,
  • get, set system data
  • get attributes
  • set attributes
• Communications
  • crearte, delete connection
  • send, receive message
  • transfer status information
  • attach or detach remote devices
• Protection
  • get, set permissions