进程调度(C语言实现).doc

.#include#include#includetypedef struct ProcessNode / 进程结点的基本结构 char name; /进程名int service_time; /服务时间int arrive_time; /到达时间int priority; /优先级struct FCFS_time /先到先服务int finish_time; /完成时间 int turnaround_time; /周转时间float weigtharound_time;/带权周转时间FCFS_time; struct SJF_time /短作业优先int finish_time; int turnaround_time; float weigtharound_time;int flag;SJF_time; struct RR_time /时间片轮转的结点int finish_time; int turnaround_time; float weigtharound_time;int flag_time;/赋值为进程的服务时间，为0则进程完成RR_time; struct Pri_time /优先权非抢占式int finish_time; int turnaround_time; float weigtharound_time;Pri_time;struct ProcessNode*next;ProcessNode,*Linklist;void main() int choice; Linklist p,head; Linklist read_information();Linklist FCFS_scheduling(Linklist head); Linklist SJF_scheduling(Linklist head); Linklist RR_scheduling(Linklist head); Linklist Pri_scheduling(Linklist head); head=read_information();/读入进程的基本信息do p=head-next; printf(n);printf(*进程初始信息输出* n); /输出初始化后的进程基本信息printf(n);printf(进程名称 ); printf(到达时间 ); printf(服务时间 ); printf(优先级 ); printf(n);while(p) printf( %c ,p-name); printf( %d ,p-arrive_time); printf( %d ,p-service_time); printf( %d ,p-priority); printf(n); p=p-next;printf(n); printf(* n);/输出进程的调用选择项printf(n);printf(1、FCFS-先到先服务n);printf(2、SJF-短作业优先n);printf(3、RR-时间片轮转n);printf(4、Pri-优先权调度n); printf(5、退出n);printf(n);printf(* n);printf(n);printf(请在15之间选择: );scanf(%d,&choice);printf(n); printf(n); switch(choice) case 1: FCFS_scheduling(head); break; case 2: SJF_scheduling(head); break; case 3: RR_scheduling(head); break; case 4: Pri_scheduling(head); break; / case 5: exit(); while(choice!=5);Linklist read_information()/进程读入函数 int i; intnum; / ProcessNode ;Linklist pro;Linklist p; Linklist head; printf(n); printf(*进程调度算法* n);printf(n);printf(请输入进程的个数:); scanf(%d,&num);printf(n);printf(*初始化信息* n);printf(n); head=(Linklist)malloc(sizeof(ProcessNode);/头结点head-next=NULL;p=head; for(i=1;iname);printf( 到达时间: );scanf(%d,&pro-arrive_time);printf( 服务时间: ); scanf(%d,&pro-service_time);printf( 优先级: );scanf(%d,&pro-priority); /pro-next=head-next; head-next=pro;/逆序建链 p-next=pro; p=pro;/顺序建链/p+;pro-next=NULL; printf(n); return head; Linklist FCFS_scheduling(Linklist head)/先到先服务算法函数 Linklist p; Linklist q;/指向前一进程 p=head-next; while(p) /初始化进程的完成时间、周转时间、带权周转时间，初值均赋为0 p-FCFS_time.finish_time=0; p-FCFS_time.turnaround_time=0; p-FCFS_time.weigtharound_time=0; p=p-next; p=q=head-next; p-FCFS_time.finish_time=p-arrive_time;/避免第一个进程到达时间不为0 while(p) if(p-arrive_timeFCFS_time.finish_time)/下一进程已到达，在等待中 p-FCFS_time.finish_time=(p-service_time)+(q-FCFS_time.finish_time);/服务时间 p-FCFS_time.turnaround_time=(p-FCFS_time.finish_time)-(p-arrive_time);/周转时间 p-FCFS_time.weigtharound_time=(float)(p-FCFS_time.turnaround_time)/(p-service_time);/带权周转时间 else p-FCFS_time.finish_time=p-service_time+p-arrive_time;/服务时间 p-FCFS_time.turnaround_time=(p-FCFS_time.finish_time)-(p-arrive_time);/周转时间 p-FCFS_time.weigtharound_time=(float)(p-FCFS_time.turnaround_time)/(p-service_time);/带权周转时间 q=p; p=p-next; p=head-next; printf(* FCFS * n);/输出先到先服务调度后的进程信息printf(n);printf(进程名称 ); printf(到达时间 ); printf(服务时间 ); printf(优先级 );printf(完成时间 );printf(周转时间 ); printf(带权周转时间 ); printf(n); while(p) printf( %c ,p-name);printf( %d ,p-arrive_time); printf( %d ,p-service_time); printf( %d ,p-priority); printf( %d,p-FCFS_time.finish_time); printf( %d,p-FCFS_time.turnaround_time); printf( %0.2f,p-FCFS_time.weigtharound_time); printf(n);p=p-next; printf(n); printf(* n); printf(n); return head;Linklist SJF_scheduling(Linklist head)/短作业优先算法 Linklist p,r;Linklist q;/指向前一进程结点 int num=0;/记录进程个数 int add_flag=0;/进程完成服务个数int service_time_min;int arrive_time;int k;p=head-next;/首元结点 while(p) /初始化进程的完成时间、周转时间、带权周转时间，初值均赋为0 p-SJF_time.finish_time=0; p-SJF_time.turnaround_time=0; p-SJF_time.weigtharound_time=0; p-SJF_time.flag=0; +num; q=p; p=p-next; q-next=head-next;/将创建的进程队列变为循环队列 p=head-next;q=p;p-SJF_time.finish_time=p-arrive_time+p-service_time; p-SJF_time.turnaround_time=(p-SJF_time.finish_time)-(p-arrive_time);/周转时间 p-SJF_time.weigtharound_time=(float)(p-SJF_time.turnaround_time)/(p-service_time);/带权周转时间q-SJF_time.finish_time=p-SJF_time.finish_time; p-SJF_time.flag=1;add_flag=1;p=p-next; do if(p-SJF_time.flag=1)p=p-next; else if(p-arrive_time)(q-SJF_time.finish_time) service_time_min=p-service_time; arrive_time=p-arrive_time; while(p-arrive_time=arrive_time&p-SJF_time.flag=0)/寻找最短的作业 if(p-next-service_time)service_time)service_time_min=p-next-service_time;p=p-next; else p=p-next; p=q-next; r=q; while(p-service_time!=service_time_min)p=p-next;/指针指向最短作业 p-SJF_time.finish_time=p-arrive_time+p-service_time; p-SJF_time.flag=1;+add_flag; p-SJF_time.turnaround_time=(p-SJF_time.finish_time)-(p-arrive_time);/周转时间 p-SJF_time.weigtharound_time=(float)(p-SJF_time.turnaround_time)/(p-service_time);/带权周转时间 q=p;p=r-next; else k=0; service_time_min=p-service_time; while(p-arrive_time)SJF_time.finish_time)&kSJF_time.flag=1) p=p-next;+k; else if(p-SJF_time.flag!=1)&(p-service_time)service_time; p=p-next;+k; else p=p-next;+k; p=q-next; r=q; while(p-service_time!=service_time_min)p=p-next;/指针指向最短作业 p-SJF_time.finish_time=q-SJF_time.finish_time+p-service_time; p-SJF_time.turnaround_time=(p-SJF_time.finish_time)-(p-arrive_time);/周转时间 p-SJF_time.weigtharound_time=(float)(p-SJF_time.turnaround_time)/(p-service_time);/带权周转时间 p-SJF_time.flag=1;+add_flag; /q=p;p=p-next; q=p;p=r-next; while(add_flag!=num); for(p=head-next;num0;num-)/断开循环队列 q=p;p=p-next;q-next=NULL; p=head-next;/指向链首，输出短作业调度后的进程信息 printf(n); printf(* SJF * n);printf(n);printf(进程名称 ); printf(到达时间 ); printf(服务时间 ); printf(优先级 );printf(完成时间 );printf(周转时间 ); printf(带权周转时间 ); printf(n); while(p) printf( %c ,p-name);printf( %d ,p-arrive_time); printf( %d ,p-service_time); printf( %d ,p-priority); printf( %d,p-SJF_time.finish_time); printf( %d,p-SJF_time.turnaround_time); printf( %0.2f,p-SJF_time.weigtharound_time); printf(n);p=p-next; printf(n); printf(* n); printf(n); return head;Linklist RR_scheduling(Linklist head)/时间片轮转算法Linklist q;/指向前一进程结点 Linklist p;int q_time;/时间片大小int num=0;/记录进程个数 int add_flag=0;/进程完成服务个数 printf(请输入时间片的大小: );scanf(%d,&q_time); p=head-next; while(p) /初始化进程的完成时间、周转时间、带权周转时间，初值均赋为0 p-RR_time.finish_time=0; p-RR_time.turnaround_time=0; p-RR_time.weigtharound_time=0; p-RR_time.flag_time=p-service_time; q=p; +num; p=p-next; q-next=head-next;/将创建的进程队列变为循环队列 p=head-next; q-RR_time.finish_time=p-arrive_time;do /* printf(n); printf(* n); printf( %c ,p-name); printf( %d ,p-arrive_time); printf( %d ,p-service_time); printf( %d ,p-priority); printf( %d,p-RR_time.finish_time); printf(n); */ if(p-RR_time.flag_time)(q_time)/服务时间大于时间片 p-RR_time.finish_time=(q-RR_time.finish_time)+(q_time);/累加完成时间 p-RR_time.flag_time=(p-RR_time.flag_time)-(q_time); if(p-next-arrive_time)RR_time.finish_time)/有进程等待 q=p;p=p-next; else /当前进程未完成，无进程等待，指针不向后移 q=p; else if(p-RR_time.flag_time)=0)/进程已经完成 p=p-next; else p-RR_time.finish_time=(q-RR_time.finish_time)+(p-RR_time.flag_time); p-RR_time.flag_time=0; +add_flag; p-RR_time.turnaround_time=(p-RR_time.finish_time)-(p-arrive_time);/周转时间 p-RR_time.weigtharound_time=(float)(p-RR_time.turnaround_time)/(p-service_time);/带权周转时间 if(p-next-arrive_time)RR_time.finish_time)/有进程等待 q=p;p=p-n