A-level 计算机 2009/CIE/操作系统

基本流程

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  |                                      | Yes                          | Yes                                | Yes
  V                                      |                              |                                    |

开始 - 获取 - 解码 - 执行 - 检查中断 - 否 - 检查更多指令 - 否 - 返回到上一条指令？ - 否 - 结束

操作系统由 4 个组件组成

     User interface  -  provides an interface for the user to communicate with the hardware

     Kernel          -  translates the inputs from the U.I. in Machine Code for the hardware ( device drivers and utilities ) to understand

     Device drivers  -  The set of instructions that the hardware can understand ( a user manual of the device for the kernel , basically )

     Utilities       - Power management, Managing Fragmentation, System Security etc.

调度程序

  The Scheduler is a part of the OS that manages how much time each process spends using the processor.

参考文献