操作系统实验一之进程管理源代码

来源：互联网发布：f3飞控调参软件cf 编辑：程序博客网时间：2024/04/25 21:13

1．目的和要求

通过实验理解进程的概念，进程的组成（PCB结构），进程的并发执行和操作系统进行进程管理的相关原语（主要是进程的创建、执行、撤消）。

2．实验内容

用C语言编程模拟进程管理，至少要有：创建新的进程；查看运行进程；换出某个进程；杀死运行进程以及进程之间通信等功能。

3．主体程序

#include <conio.h>

#include <stdio.h>

#include <stdlib.h>

struct PCB_type

{ int pid;

int priority;

int cputime;

int state;

int shumu=0,pid_l;

struct PCB_type neicun[20];

struct PCB_type hc[10];

int max=0;int number=0;

void create();

void run();

void huanchu();

void kill();

/* 创建新进程 */

void create()

{

if(shumu>=20)

{

printf("\n内存已满，请先结束或换出进程\n");

}

else

{

shumu++;

printf("\n请输入新进程的程序名\n");

scanf("%d",&neicun[shumu-1].pid);

printf("\n请输入新进程的优先级\n");

scanf("%d",&neicun[shumu-1].priority);

printf("\n请输入新进程的运行时间\n");

scanf("%d",&neicun[shumu-1].cputime);

printf("\n创建进程时令其状态为就绪\n");

neicun[shumu-1].state=2;

}

printf("\n创建进程成功!\n");

}

/* 查看当前运行进程 */

void run()

{

int max=0;

for(int i=0;i<shumu;i++)

{

if((neicun[i].state==1)&&(neicun[i].priority>=neicun[max].priority))

max=i;

}

neicun[max].state=3;

printf("当前运行进程程序名:\n%d",neicun[max].pid);

printf("\n该进程的优先级:\n%d",neicun[max].priority);

printf("\n该进程的运行时间:\n%d",neicun[max].cputime);

printf("\n该进程的状态:\n%d",neicun[max].state);

}

/* 换出 */

void huanchu()

{

int k;

printf("请输入要换出程序的程序名:");

scanf("%d",&k);

for(int j=0;j<shumu;j++)

{

if(neicun[j].state==1)

{

hc[number].pid=neicun[j].pid;

hc[number].state=neicun[j].state;

hc[number].priority=neicun[j].priority;

hc[number].cputime=neicun[j].cputime;

number++;

neicun[j].pid=0;

neicun[j].state=0;

neicun[j].priority=0;

neicun[j].cputime=0;

pid_1++;

}

else printf("进程%d无法换出的pid:%d\n",j.neicun[j].pid);

if(number!=0)

for(int i=0;i<number;i++)

{

printf("当前运行进程程序名:\n%d",hc[i].pid);

printf("\n该进程的优先级:\n%d",hc[i].priority);

printf("\n该进程的运行时间:\n%d",hc[i].cputime);

printf("\n该进程的状态:\n%d",hc[i].state);

}

PCB_type temp=neicun[0];

for(k=0;k<=shumu;k++)

{

if(neicun[k].priority>temp.priority)

tmpe=neicun[k];

}

neicun[k].state=1;

}

/* 杀死进程 */

void kill()

{

neicun[max].pid=0;

neicun[max].priority=0;

neicun[max].cputime=0;

neicun[max].state=0;

if(max==(shumu-1))

shumu--;

else{

for(int j=max+1;j<shumu;j++)

{

neicun[j-1].pid=neicun[j].pid;

neicun[j-1].priority=neicun[j].priority;

neicun[j-1].cputime=neicun[j].cputime;

neicun[j-1].state=neicun[j].state;

}

shumu--;

}

max=0;

run();

}

/* int k=0;

printf("请输入要杀死程序的进程名:");

scanf("%d",&k);

if(neicun[k].state=1)

neicun[k].state=2;

neicun[k].cputime=0;

neicun[k].pid=0;

neicun[k].priority=0;

neicun[k].state=0;

if(k==(shumu-1))

shumu--;

else{

for(int j=k+1;j<shumu;j++)

{

neicun[j-1].pid=neicun[j].pid;

neicun[j-1].priority=neicun[j].priority;

neicun[j-1].cputime=neicun[j].cputime;

neicun[j-1].state=neicun[j].state;

}

shumu--;

}

printf("进程%d已被杀死!,k");

}*/

int main()

{

int n,a;

n=1;

while(n==1)

{

system("cls");

printf("\n**********************************************");

printf("\n* 进程演示系统 *");

printf("\n**********************************************");

printf("\n 1.创建新的进程 2.查看运行进程");

printf("\n 3.换出某个进程 4.杀死运行进程");

printf("\n 5.退出系统 ");

printf("\n**********************************************");

printf("\n请选择(1～5):");

scanf("%d",&a);

switch(a)

{ case 1:

create( );

printf("\npress anykey to go on~");

getch();

break;

case 2 :

run();

printf("\npress anykey to go on~");

getch();

break;

case 3 :

huanchu();

printf("\npress anykey to go on~");

getch();

break;

case 4 :

kill();

printf("\npress anykey to go on~");

getch();

break;

case 5 :

exit(0);

default:

n=0;

break;

}

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