jinchengdiaodu.rar_4 3 2 1_jinchengdiaodu_操作系统 短作业优先

// zcn.cpp : Defines the entry point for the console application. // #include"stdafx.h" #include<iostream> using namespace std; #define MAX 10 struct task_struct { char name[10]; /*进程名称*/ int number; /*进程编号*/ float come_time; /*到达时间*/ float run_begin_time; /*开始运行时间*/ float run_time; /*运行时间*/ float run_end_time; /*运行结束时间*/ int priority; /*优先级*/ int order; /*运行次序*/ int run_flag; /*调度标志*/ }tasks[MAX]; int counter; /*实际进程个数*/ int fcfs(); /*先来先服务*/ int ps(); /*优先级调度*/ int sjf(); /*短作业优先*/ int hrrn(); /*响应比高优先*/ int pinput(); /*进程参数输入*/ int poutput(); /*调度结果输出*/ //*******************************************主函数*************************** void main(int argc, char* argv[]) { int option; pinput(); printf("请选择调度算法（0~4）:\n"); printf(" 1.先来先服务\n"); printf(" 2.优先级调度\n"); printf(" 3.短作业优先\n"); printf(" 4.响应比高优先\n"); scanf("%d",&option); switch (option) { case 0: printf("运行结束。\n"); break; case 1: printf("对进程按先来先服务调度。\n\n"); fcfs(); poutput(); break; case 2: printf("对进程按优先级调度。\n\n"); ps(); poutput(); break; case 3: printf("对进程按短作业优先调度。\n\n"); sjf(); poutput(); break; case 4: printf("对进程按响应比高优先调度。\n\n"); hrrn(); poutput(); break; } } int fcfs() /*先来先服务*/ { float time_temp=0; int i; int number_schedul; time_temp=tasks[0].come_time; for(i=0;i<counter;i++) { tasks[i].run_begin_time=time_temp; tasks[i].run_end_time=tasks[i].run_begin_time+tasks[i].run_time; tasks[i].run_flag=1; time_temp=tasks[i].run_end_time; number_schedul=i; tasks[number_schedul].order=i+1; } return 0; } int ps() /*优先级调度*/ { float temp_time=0; int i=0,j; int number_schedul,temp_counter; int max_priority; max_priority=tasks[i].priority; j=1; while ((j<counter)&&(tasks[i].come_time==tasks[j].come_time)) { if (tasks[j].priority>tasks[i].priority) { max_priority=tasks[j].priority; i=j; } j++; } /*查找第一个被调度的进程*/ /*对第一个被调度的进程求相应的参数*/ number_schedul=i; tasks[number_schedul].run_begin_time=tasks[number_schedul].come_time; tasks[number_schedul].run_end_time=tasks[number_schedul].run_begin_time+tasks[number_schedul].run_time; tasks[number_schedul].run_flag=1; temp_time=tasks[number_schedul].run_end_time; tasks[number_schedul].order=1; temp_counter=1; while (temp_counter<counter) { max_priority=0; for(j=0;j<counter;j++) { if((tasks[j].come_time<=temp_time)&&(!tasks[j].run_flag)) if (tasks[j].priority>max_priority) { max_priority=tasks[j].priority; number_schedul=j; } } /*查找下一个被调度的进程*/ /*对找到的下一个被调度的进程求相应的参数*/ tasks[number_schedul].run_begin_time=temp_time; tasks[number_schedul].run_end_time=tasks[number_schedul].run_begin_time+tasks[number_schedul].run_time; tasks[number_schedul].run_flag=1; temp_time=tasks[number_schedul].run_end_time; temp_counter++; tasks[number_schedul].order=temp_counter; } return 0; } int sjf() /*短作业优先*/ { float temp_time=0; int i=0,j; int number_schedul,temp_counter; float run_time; run_time=tasks[i].run_time; j=1; while ((j<counter)&&(tasks[i].come_time==tasks[j].come_time)) { if (tasks[j].run_time<tasks[i].run_time) { run_time=tasks[j].run_time; i=j; } j++; } /*查找第一个被调度的进程*/ /*对第一个被调度的进程求相应的参数*/ number_schedul=i; tasks[number_schedul].run_begin_time=tasks[number_schedul].come_time; tasks[number_schedul].run_end_time=tasks[number_schedul].run_begin_time+tasks[number_schedul].run_time; tasks[number_schedul].run_flag=1; temp_time=tasks[number_schedul].run_end_time; tasks[number_schedul].order=1; temp_counter=1; while (temp_counter<counter) { for(j=0;j<counter;j++) { if((tasks[j].come_time<=temp_time)&&(!tasks[j].run_flag)) { run_time=tasks[j].run_time;number_schedul=j;break; } } for(j=0;j<counter;j++) { if((tasks[j].come_time<=temp_time)&&(!tasks[j].run_flag)) if(tasks[j].run_time<run_time) { run_time=tasks[j].run_time; number_schedul=j; } } /*查找下一个被调度的进程*/ /*对找到的下一个被调度的进程求相应的参数*/ tasks[number_schedul].run_begin_time=temp_time; tasks[number_schedul].run_end_time=tasks[number_schedul].run_begin_time+tasks[number_schedul].run_time; tasks[number_schedul].run_flag=1; temp_time=tasks[number_schedul].run_end_time; temp_counter++; tasks[number_schedul].order=temp_counter; } return 0; } int hrrn() /*响应比高优先*/ { int j,number_schedul,temp_counter; float temp_time,respond_rate,max_respond_rate; /*第一个进程被调度*/ tasks[0].run_begin_time=tasks[0].come_time; tasks[0].run_end_time=tasks[0].run_begin_time+tasks[0].run_time; temp_time=tasks[0].run_end_time; tasks[0].run_flag=1; tasks[0].order=1; temp_counter=1; /*调度其他进程*/ while(temp_counter<counter) { max_respond_rate=0; for(j=1;j<counter;j++) { if((tasks[j].come_time<=temp_time)&&(!tasks[j].run_flag)) { respond_rate=(temp_time-tasks[j].come_time)/tasks[j].run_time; if (respond_rate>max_respond_rate) { max_respond_rate=respond_rate; number_schedul=j; } } } /*找响应比高的进程*/ tasks[number_schedul].run_begin_time=temp_time; tasks[number_schedul].run_end_time=tasks[number_schedul].run_begin_time+tasks[number_schedul].run_time; temp_time=tasks[number_schedul].run_end_time; tasks[number_schedul].run_flag=1; temp_counter+=1; tasks[number_schedul].order=temp_counter; } return 0; } int pinput() /*进程参数输入*/ { int i; printf("请输入实际进程个数:\n"); scanf("%d",&counter); //实际进程个数 for(i=0;i<counter;i++) { printf("******************************************\n"); printf("请输入第 %d 个 :\n",i+1); printf("请输入进程名:\n"); scanf("%s",tasks[i].name); printf("请输入进程号:\n"); scanf("%d",&tasks[i].number); printf("请输入进程到达时间:\n"); scanf("%f",&tasks[i].come_time); printf("请输入运行时间:\n"); scanf("%f",&tasks[i].run_time); printf("请输入进程优先级:\n"); scanf("%d",&tasks[i].priority); tasks[i].run_begin_time=0; tasks[i].run_end_time=0; tasks[i].order=0; tasks[i].run_flag=0; } return 0; } int poutput() /*调度结果输出*/ { int i; float turn_round_time=0,f1,w=0; printf("进程名 进程号 到达时间 运行时间 开始运行时间 结束运行时间 优先级 运行次序 \n"); for(i=0;i<counter;i++) { f1=tasks[i].run_end_time-tasks[i].come_time; turn_round_time+=f1; w+=(f1/tasks[i].run_time)