A-level 計算機 2009/CIE/作業系統

基本流程

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  |                                      | Yes                          | Yes                                | Yes
  V                                      |                              |                                    |

開始 - 獲取 - 解碼 - 執行 - 檢查中斷 - 否 - 檢查更多指令 - 否 - 返回到上一條指令？ - 否 - 結束

作業系統由 4 個元件組成

     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.

排程程式

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