操作系统课程设计.docx

任务一、进程创建、控制与撤消目的:通过进程的创建和控制的设计来达到如下目的:加深对进程概念的理解,明确进程和程序的区别;进一步认识并发执行的概念,区别顺序执行和并发执行;分析进程争用临界资源的现象,学****解决进程互斥的方法;内容:在WINDOWS环境下模拟实验:编写一程序,来模拟进程的创建和撤消,要求通过终端键盘输入三、四作业的名称、大小、优先级等。系统为它创建进程,并把进程控制块PCB的内容送到终端显示器上输出。同时模拟内存空间为作业分配内存空间,并把结果用图形形象地表示出来,同样通过终端输出。按进程的优先级的顺序撤消进程,同时通过终端显示PCB的撤消过程和内存的释放过程程序流程图:源代码如下:#include<iostream>;usingnamespacestd;structPCB{ intpid; intpriority; intsize; intdetail; intisrun;};PCBrunning[20],ready[20];intsum=0,pid_1;voidchoose();voidmenu();intcreate(){ if(sum>=20) { cout<<"内存已满,请先结束或换出进程"<<endl; } else { cout<<"请输入第"<<sum+1<<"个进程"<<endl; cout<<"请输入进程的pid"<<endl;cin>>running[sum+1].pid; cout<<"请输入新的进程的优先级"<<endl; cin>>running[sum+1].priority; cout<<"请输入新的进程的大小"<<endl; cin>>running[sum+1].size; cout<<"请输入新的进程的详情"<<endl; cin>>running[sum+1].detail; running[sum+1].isrun=1;sum++; } returnrunning[sum-1].isrun; choose();}voiddisplay(){ intpid; cout<<"请输入进程的pid"<<endl; cin>>pid; if(pid>0&&pid<=20&&running[pid].isrun==1) { cout<<"进程的pid是:"<<running[pid].pid<<endl; cout<<"进程的优先级是:"<<running[pid].priority<<endl; cout<<"进程的大小是:"<<running[pid].size<<endl; cout<<"进程的相关信息:"<<running[pid].detail<<endl; } else { cout<<"所查看运行进程不存在"<<endl; } choose();}voidreplace(){ intpid1,pid2; cout<<"请输入第一个替换进程的pid"<<endl; cin>>pid1; cout<<"请输入第二个替换进程的pid"<<endl; cin>>pid2; if(pid1>0&&pid1<=20&&running[pid1].isrun==1) { if(running[pid1].priority>running[pid2].priority) { ready[20].pid=running[pid1].pid; ready[20].priority=running[pid1].priority; ready[20].size=running[pid1].size; ready[20].detail=running[pid1].detail; running[pid1].pid=running[pid2].pid; running[pid1].priority=running[pid2].priority; running[pid1].size=running[pid2].size; running[pid1].detail=running[pid2].detail; running[pid2].pid=ready[20].pid; running[pid2].priority=ready[20].priority; running[pid2].size=ready[20].size; running[pid2].detail=ready[20].detail; cout<<"替换完成"<<endl; cout<<"被替换进程的pid是:"<<ready[20].pid<<endl; cout<<"被替换进程的优先级是:",ready[20].priority; cout<<"被替换进程的大小是:"<<ready[20].size<<endl; cout<<"被