rr時(shí)間片輪轉(zhuǎn)調(diào)度代碼

rr時(shí)間片輪轉(zhuǎn)調(diào)度代碼時(shí)間片輪轉(zhuǎn)調(diào)度算法是一種常用的進(jìn)程調(diào)度算法，它是一種基于時(shí)間片的調(diào)度算法。在操作系統(tǒng)中，多個(gè)進(jìn)程需要競爭CPU的使用權(quán)。時(shí)間片輪轉(zhuǎn)調(diào)度算法通過給每個(gè)進(jìn)程分配相同的時(shí)間片，在每個(gè)時(shí)間片結(jié)束時(shí)切換到下一個(gè)進(jìn)程，以實(shí)現(xiàn)公平的資源分配和提高系統(tǒng)的響應(yīng)性。下面我將介紹時(shí)間片輪轉(zhuǎn)調(diào)度算法的原理和代碼實(shí)現(xiàn)。時(shí)間片輪轉(zhuǎn)調(diào)度算法的原理是將所有就緒狀態(tài)的進(jìn)程按照到達(dá)順序排成一個(gè)隊(duì)列，并為每個(gè)進(jìn)程分配一個(gè)固定長度的時(shí)間片。當(dāng)一個(gè)進(jìn)程的時(shí)間片用完后，系統(tǒng)將當(dāng)前進(jìn)程放到隊(duì)尾，從隊(duì)列的頭部取下一個(gè)進(jìn)程執(zhí)行，如此循環(huán)執(zhí)行，直到所有進(jìn)程都執(zhí)行完畢。下面是一個(gè)使用C語言實(shí)現(xiàn)時(shí)間片輪轉(zhuǎn)調(diào)度算法的示例代碼：```c#include<stdio.h>#defineMAX_PROCESSES10#defineTIME_SLICE5structProcess{intpid;intburst_time;intremaining_time;};voidroundRobinScheduling(structProcessprocesses[],intn){inti,j;inttotal_time=0;inttotal_waiting_time=0;inttime_quantum=TIME_SLICE;for(i=0;i<n;i++){total_time+=processes[i].burst_time;processes[i].remaining_time=processes[i].burst_time;}while(total_time>0){for(i=0;i<n;i++){if(processes[i].remaining_time>0){if(processes[i].remaining_time<=time_quantum){total_time-=processes[i].remaining_time;total_waiting_time+=total_time;processes[i].remaining_time=0;}else{total_time-=time_quantum;total_waiting_time+=total_time;processes[i].remaining_time-=time_quantum;}}}}floataverage_waiting_time=(float)total_waiting_time/n;printf("Averagewaitingtime:%.2f\n",average_waiting_time);}intmain(){structProcessprocesses[MAX_PROCESSES];intn,i;printf("Enterthenumberofprocesses:");scanf("%d",&n);for(i=0;i<n;i++){printf("Enterbursttimeforprocess%d:",i+1);scanf("%d",&processes[i].burst_time);processes[i].pid=i+1;}roundRobinScheduling(processes,n);return0;}```在該代碼中，我們定義了一個(gè)進(jìn)程的結(jié)構(gòu)體`Process`，包含進(jìn)程的id、執(zhí)行時(shí)間和剩余執(zhí)行時(shí)間。`roundRobinScheduling`函數(shù)使用時(shí)間片輪轉(zhuǎn)調(diào)度算法來計(jì)算平均等待時(shí)間。首先，計(jì)算所有進(jìn)程的總執(zhí)行時(shí)間`total_time`，然后在每個(gè)時(shí)間片中進(jìn)行循環(huán)，對每個(gè)進(jìn)程進(jìn)行判斷，如果剩余執(zhí)行時(shí)間小于等于時(shí)間片，那么將剩余執(zhí)行時(shí)間減去剩余時(shí)間，并計(jì)算總等待時(shí)間。如果剩余執(zhí)行時(shí)間大于時(shí)間片，那么將剩余執(zhí)行時(shí)間減去時(shí)間片，并計(jì)算總等待時(shí)間。最后，計(jì)算平均等待時(shí)間并輸出。主函數(shù)中通過用戶輸入設(shè)置進(jìn)程的數(shù)量和各個(gè)進(jìn)程的執(zhí)行時(shí)間，然后調(diào)用`roundRobinScheduling`函數(shù)進(jìn)行調(diào)度。通過使用時(shí)間片輪轉(zhuǎn)調(diào)度算法，我們可以公平地安排多個(gè)進(jìn)程的執(zhí)行，實(shí)現(xiàn)資源的均衡利用。此算