操作系统实验报告

课程设计实验报告课程名称：操作系统原理姓名：学号：2012年06月18日青岛工学院信息工程系实验报告实验一进程创建1.实验目的了解在linux系统c语言下的编译环境。

熟练地进行程序的编译，执行。

2.实验环境配置Linux系统下3.实验内容（源代码）#include<stdio.h>int main(){int p1,p2;while((p1=fork())==-1);if(p1==0){putchar('b');return 0;}else{putchar('a');while((p2=fork())==-1);if(p2==0){putchar('c');return 0;}}}4.实验结果分析运行结果可能是：baca、baac、aacb等实验二管道通信1.实验目的了解什么是管道熟悉Unix/Linux操作系统支持管道通信2.实验内容（源代码）#include<unistd.h>#include<stdio.h>#include<signal.h>#include<stdlib.h>int pid1,pid2;main(){int fd[3];char OutPipe[100],InPipe[100];pipe(fd);while((pid1=fork())==-1);if(pid1==0){wait(0);printf("p1\n");lockf(fd[0],1,0);printf("p1:");read(fd[0],InPipe,50);printf("%s\n",InPipe);lockf(fd[0],0,0);exit(0);}else{while((pid2=fork())==-1);if(pid2==0){wait(0);printf("p2\n");lockf(fd[0],1,0);printf("p2:");read(fd[0],InPipe,50);printf("%s\n",InPipe);lockf(fd[0],0,0);exit(0);}else{printf("parent\n");sprintf(OutPipe,"child 1 process is sending a message!");write(fd[1],OutPipe,50);sleep(1);sprintf(OutPipe,"Child 2 process is sending a message!");sleep(2);write(fd[1],OutPipe,50);sleep(1);exit(0);}}return 0;}3.实验结果分析可能的执行结果：p1p2parentp2:child 1 process is sending a message!p1:Child 2 process is sending a message!管道运行结果parentp1p1:child 1 process is sending a message!p2p2:Child 2 process is sending a message!p1p2parentp1:child 1 process is sending a message!p2:Child 2 process is sending a message!parentp2p2:child 1 process is sending a message! p1p1:Child 2 process is sending a message!p1parentp1:child 1 process is sending a message! p2p2:Child 2 process is sending a message!实验三软中断通信1.实验目的理解掌握软中断的概念和技术掌握进程之间基于软中断的通信技术2.实验内容（源代码）#include <unistd.h>#include<stdio.h>#include<signal.h>#include<stdlib.h>#include<sys/types.h>#include<sys/wait.h>void waiting(),stop();int wait_mark;main(){int p1,p2;int stdout;while ((p1=fork())==-1);if (p1>0){while((p2=fork())==-1);if(p2>0) {printf("parent\n");wait_mark=1;signal(SIGINT,stop);waiting ();kill(p1,16);kill(p2,17);wait(0);wait(0);printf("parent process is killed !\n");exit(0);}else{signal(SIGINT,stop);printf("p2\n");wait_mark=1;signal(17,stop);waiting();lockf(stdout,1,0);printf("child process 2 is killed by parent!\n"); lockf(stdout,0,0);exit(0);}}else{signal(SIGINT,stop);printf("p1\n");wait_mark=1;signal(16,stop);waiting();lockf(stdout,1,0);printf("child process 1 is killed by parent!\n"); lockf(stdout,0,0);exit(0);}}void waiting(){while(wait_mark!=0);}void stop(){wait_mark=0;}3.实验结果分析发出软中断通信后，挂起结束，子进程打印出相应的代码实验四银行家算法1、实验目的加深对操作系统的进程管理与资源分配了解，深刻理解系统安全性检验算法2、实验内容（源代码）#include<stdio.h>#define M 6#define N 3void main(){int p[N][M];int a,i,j,k,m,flag=1;char b;while(flag){system("CLS");printf("\nthere are %d process in system!\n",N);printf("\nplease input the maxresource!\n");for(i=0;i<N;i++){printf("\ninput the maxresource of p%d:",i);scanf("%d",&p[i][1]);}printf("\nplease input the allocation!\n");for(i=0;i<N;i++){printf("\ninput the allocation of p%d:",i);scanf("%d",&p[i][2]);}printf("\nplease input the available of resources:");scanf("%d",&a);for(i=0;i<N;i++){p[i][3]=p[i][1]-p[i][2];p[i][5]=0;p[i][4]=0;}printf("\n");printf(" Process Id Max Allocation Need Available\n");printf("\n");for(i=0;i<N;i++){printf("P%d %6d %6d %6d %6d\n",i,p[i][1],p[i][2],p[i][3],p[i][4]); printf("\n");}printf("\nnow process will requst resources!");getch();for(j=0;j<N;j++){i=0;while(i<N){if(!p[i][5]){if(p[i][3]<=a){printf(" P%d",i);p[i][4]=a;a=a+p[i][2];p[i][5]=1;}}i++;}}if(p[0][5]==0&&p[1][5]==0&&p[2][5]==0&&p[3][5]==0)printf("\nthere is not enough resources to distribution!\nno process can request successfully!\n");printf("\nthe table of request and distribution is:\n");printf("\n");printf("Process Id Max Allocation Need Available \n");printf("\n");for(i=0;i<N;i++){printf("P%d %6d %6d %6d %6d \n",i,p[i][1],p[i][2],p[i][3],p[i][4]);printf("\n");}printf("please input '1' to continue or '0' to exit!\n");scanf("%d",&flag);}exit();}3、实验结果分析一个进程序列是安全的，如果对于每一个进程Pi(1≤i≤n），它以后尚需要的资源量不超过系统当前剩余资源量与所有进程Pj (j < i )当前占有资源量之和，结果是正确的。