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    --- tags: NTUST --- 106 OS homework 2-2 成果報告書 === > 組長:A10615003、張家成、github帳號:GoSomewhereNice > 組員:A10615002、張海鯤、github帳號:haikun233 > 組員:A10615001、趙梓丞、github帳號:zhaozichengkv > github: https://github.com/GoSomewhereNice/xv6-syscall --- # 🙂 使用情境說明(包含流程圖) 當很多進程(process)同時需要運行,cpu會面臨誰先執行誰後執行的選擇,此刻需要為每個進程(process)設定其權限(priority),或修改其權限來讓cpu選擇最高權限的進程(先執行),其餘進程(process)ready。 ![](https://i.imgur.com/aYTM3by.png) --- # 😇 成功畫面 ![](https://i.imgur.com/E4BmnqA.png) --- # 🏃 實作過程(修改哪些檔案[含圖片]) 修改的檔案: 1."Makefile"增加代碼 ![](https://i.imgur.com/msIYKsi.png) 分別為將如下指令添加至系統 ps指令: 列出現有進程pid status priority (將計畫書中listpriority()結合至此) setpr指令: 全稱:setpriority 對指定pid的process設置其priority getpr指令: 全稱:getpriority 查詢指定pid的process所擁有的priority prt指令: 全稱:prioritytest 無限循環的消耗cpu的測試程序 2."defs.h" 增加代碼 ![](https://i.imgur.com/gYaSlEA.png) 分別為 cps: 使cps方法可以被調用的代碼 chpr: 使chpr方法可以被調用的代碼 getpr: 使getpr方法可以被調用的代碼 3."proc.c" 增加代碼 ![](https://i.imgur.com/HEHc1Wc.png) ![](https://i.imgur.com/MQGeuR5.png) ![](https://i.imgur.com/GFp5yFU.png) 分別為 p->priority = 10; 定義表示權限的變量 priority cps: 實現ps指令的代碼 chpr: 實現setpr指令的代碼 getpr 實現getpr指令的代碼 4.proc.h ![](https://i.imgur.com/hmHBte8.png) 定義priority的類型為int,並且範圍為0~20,數值越小權限越大。 5."ps.c"新建文件 ![](https://i.imgur.com/OBAWmWf.png) 調用cps方法實現ps指令。 6."syscall.c"、"syscall.h"、"usys.S"增加代碼 ![](https://i.imgur.com/LK4NqhC.png) ![](https://i.imgur.com/27m76IQ.png) ![](https://i.imgur.com/5RsceOj.png) 將cps、chpr、getpr方法添加至系統中。 7."sysproc.c"增加代碼 ![](https://i.imgur.com/b6Cy8V1.png) 調用cps、chpr、getpr方法時得到的返回值。 8."user.h"增加代碼 ![](https://i.imgur.com/wjw7iwu.png) cps、chpr、getpr的所需參數。 9."prt.c"新建文件 ![](https://i.imgur.com/jXLnDAt.png) 測試程序源碼。 --- # 😎 結論 通過此次system call的作業,我們鑽研並實現了作業系統對於進程的權限管理。我們發現實現的方式並不是唯一的,可以有很多種演算法來判斷進程執行的先後順序,可以根據不同的作業系統來實現不同的權限排程方式。除此之外,在編譯不斷報錯中,我們對於xv6中的文件和其對應的功能和作用有了一定的了解。相信對以後相關領域學習會有很大幫助。 --- # 📅 組員分工 | 組員 | 分工 | |:-----:|:-----------| | 張家成 | 1.setpr指令實現 2.scheduler()方法修改 3.prt.c測試程序初版 4.測試 5.成果報告書| | 張海鯤 | 1."ps"指令實現 2.將"ps"結合了"listpriority()"指令 3.getpr指令實現 4.測試| | 趙梓丞 | 1.prt.c測試程式最終改進版 2.getpr指令實現 3.將nice指令精簡優化至setpr指令和getpr指令中 4.測試| ---

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