最近在写操作系统的实验报告，顺带写篇博客~
题目：用C++编程来模拟 进程状态的转换
备注都在上面，一看就懂哈~
#include<stdio.h>#include<stdlib.h>#include<string.h>struct jincheng_type{ int pid; //进程的ID int youxian; //进程的优先级 int daxiao; //进程的大小 int zhuangtai;//进程的状态 char info[10];//新进程的内容};struct jincheng_type neicun[20];//内存容量，最大20个进程int shumu = 0, guaqi = 0, pid, flag = 0;/***********创建新的进程***********/void create(){ if(shumu >= 20) printf("n内存已满，请先唤出或杀死进程n"); else { int i; for( i = 0; i < 20; i++) { if(neicun[i].zhuangtai == 0) break; } printf("n请输入新进程pidn"); scanf("%d", &(neicun[i].pid)); for(int j = 0; j < i; j++) if(neicun[i].pid == neicun[j].pid) { printf("n该进程已存在n"); return; } printf("n请输入进程优先级n"); scanf("%d", &(neicun[i].youxian)); printf("n请输入进程大小n"); scanf("%d", &(neicun[i].daxiao)); printf("n请输入新进程的内容n"); scanf("%s", &(neicun[i].info)); neicun[i].zhuangtai = 1; shumu++; }}/***********查看运行进程***********/void run(){ for(int i = 0; i < 20; i++) { if(neicun[i].zhuangtai == 1) { printf("n pid = %d", neicun[i].pid); printf("youxian = %d",neicun[i].youxian); printf("daxiao = %d",neicun[i].daxiao); printf("zhuangtai = %d", neicun[i].zhuangtai); printf("info = %s", neicun[i].info); flag = 1; } } if(!flag) { printf("n当前没有运行进程n"); }}/***********唤出某个进程***********/void huancun(){ if(!shumu) { printf("n当前没有运行进程n"); return ; } printf("n输入唤出进程的ID值"); scanf("%d", &pid); for(int i = 0; i < 20; i++) { if(pid == neicun[i].pid) { if(neicun[i].zhuangtai == 1) { neicun[i].zhuangtai = 2; guaqi++; printf("n已成功唤出进程n"); } else if(neicun[i].zhuangtai == 0) printf("n要唤出的进程不存在n"); else printf("n要唤出的进程已被挂起n"); flag = 1; break; } } if(flag == 0) printf("n要唤出的进程不存在n");}/***********杀死运行进程***********/void kill(){ if(!shumu) { printf("n当前没有运行进程n"); return; } printf("n输入杀死进程的ID值"); scanf("%d", &pid); for(int i = 0; i < 20; i++) { if(pid == neicun[i].pid) { if(neicun[i].zhuangtai == 1) { neicun[i].zhuangtai = 0; shumu --; printf("n已成功杀死进程n"); } else if(neicun[i].zhuangtai == 0) printf("n要杀死的进程不存在n"); else printf("n要杀死的进程已被挂起n"); flag = 1; break; } } if(!flag) printf("n要杀死的进程不存在n");}/***********唤醒某个进程***********/void huanxing(){ if(!shumu) { printf("n当前没有运行进程n"); return; } printf("n输入pidn"); scanf("%d", &pid); for(int i = 0; i < 20; i++) { if(pid == neicun[i].pid) { flag = false; if(neicun[i].zhuangtai == 2) { neicun[i].zhuangtai = 1; guaqi --; printf("n已成功唤醒进程n"); } else if(neicun[i].zhuangtai == 0) printf("n要唤醒的进程不存在n"); else printf("n要唤醒的进程已被挂起n"); break; } } if(flag)printf("n要唤醒的进程不存在n");}int main(){ int n = 1; int num; for(int i = 0; i < 20; i++) neicun[i].zhuangtai = 0; while(n) { printf("n*********************************************************n"); printf("n 进程演示系统 n"); printf("n 1创建新的进程 2查看运行进程n"); printf("n 3唤出某个进程 4杀死运行进程n"); printf("n 5唤醒某个进程 6退出系统 n"); printf("n*********************************************************n"); printf("n请选择（1~6）n"); scanf("%d", &num); switch(num) { case 1 : create(); break; case 2 : run(); break; case 3 : huancun(); break; case 4 : kill(); break; case 5 : huanxing(); break; case 6 : exit(0); default: n = 0; } flag = 0; }}
运行结果就是这样，之后我们再来对其进行各种操作，请自行尝试，这里不做过多介绍~