2019-2020-1 20175301 20175305 20175318 实验三 实时系统

2019-2020-1 20175301 20175305 20175318 实验三 实时系统

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一 . 实验目的

1.掌握并发程序操作实现
2.学会比较不同进程的优缺点

二 . 实验仪器

嵌入式实验平台UP-TECH S24101

三 . 实验内容

1. 实验三-并发程序-1

学习使用Linux命令wc(1)
基于Linux Socket程序设计实现wc（1）服务器(端口号是你学号的后6位)和客户端
客户端传一个文本文件给服务器
服务器返加文本文件中的单词数

实验代码

server

#include   
#include   
#include   
#include   
#include   
#include 

#define MYPORT 175301

void main(){
    int clientfd;
    struct sockaddr_in remote_addr;
    char buffer[BUFSIZ];
    memset(&remote_addr, 0 , sizeof(remote_addr));
    remote_addr.sin_family=AF_INET;
    remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
    remote_addr.sin_port=htons(MYPORT);

    if((clientfd=socket(PF_INET,SOCK_STREAM,0))<0){  
        perror("socket");  
    }

    if(connect(clientfd, (struct sockaddr *)&remote_addr, sizeof(struct sockaddr))<0){
        perror("connect");
    }

    int len;
    FILE *fp;
    char path[20];
    gets(path);
    fp=fopen(path, "r");
    char readch;
    int i=0;
    while((readch=fgetc(fp))!=EOF){
        if(i<1024){
            buffer[i]=readch;
            i++;
        }
        else{
            i=0;
            int n=send(clientfd, buffer, 1024, 0);
        }
    }
    fclose(fp);
    if(i!=0) 
        send(clientfd, buffer, i, 0);
    long wordscount;
    recv(clientfd, &wordscount, sizeof(long), 0);
    printf("%ld\n", wordscount);
    close(clientfd);
}

client

#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define MYPORT 175301
pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;
int serverfd, clientfd;
char buffer[BUFSIZ];

void *wc(void *m){
    pthread_mutex_lock( &counter_mutex );
    int len, i;
    long wordscount=0;
    int flag=1;
    while(1){
        if((len=recv(clientfd, buffer, 1024, 0))>0){
            for(i=0; i

实验截图

2. 实验三-并发程序-2

使用多线程实现wc服务器并使用同步互斥机制保证计数正确
上方提交代码
下方提交测试
对比单线程版本的性能，并分析原因

实验代码

server

#include   
#include   
#include   
#include   
#include   
#include 

#define MYPORT 175301

void main(){
    int clientfd;
    struct sockaddr_in remote_addr;
    char buffer[BUFSIZ];
    memset(&remote_addr, 0 , sizeof(remote_addr));
    remote_addr.sin_family=AF_INET;
    remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
    remote_addr.sin_port=htons(MYPORT);

    if((clientfd=socket(PF_INET,SOCK_STREAM,0))<0){  
        perror("socket");  
    }

    if(connect(clientfd, (struct sockaddr *)&remote_addr, sizeof(struct sockaddr))<0){
        perror("connect");
    }

    int len;
    FILE *fp;
    char path[20];
    gets(path);
    fp=fopen(path, "r");
    char readch;
    int i=0;
    while((readch=fgetc(fp))!=EOF){
        if(i<1024){
            buffer[i]=readch;
            i++;
        }
        else{
            i=0;
            int n=send(clientfd, buffer, 1024, 0);
        }
    }
    fclose(fp);
    if(i!=0) 
        send(clientfd, buffer, i, 0);
    long wordscount;
    recv(clientfd, &wordscount, sizeof(long), 0);
    printf("%ld\n", wordscount);
    close(clientfd);
}

client

#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define MYPORT 175301
pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;
int serverfd, clientfd;
char buffer[BUFSIZ];

void *wc(void *m){
    pthread_mutex_lock( &counter_mutex );
    int len, i;
    long wordscount=0;
    int flag=1;
    while(1){
        if((len=recv(clientfd, buffer, 1024, 0))>0){
            for(i=0; i

实验截图

3. 实验三-并发程序-3

交叉编译多线程版本服务器并部署到实验箱中
PC机作客户端测试wc服务器
提交测试截图

实验代码

server

#include   
#include   
#include   
#include   
#include   
#include 

#define MYPORT 175301

void main(){
    int clientfd;
    struct sockaddr_in remote_addr;
    char buffer[BUFSIZ];
    memset(&remote_addr, 0 , sizeof(remote_addr));
    remote_addr.sin_family=AF_INET;
    remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
    remote_addr.sin_port=htons(MYPORT);

    if((clientfd=socket(PF_INET,SOCK_STREAM,0))<0){  
        perror("socket");  
    }

    if(connect(clientfd, (struct sockaddr *)&remote_addr, sizeof(struct sockaddr))<0){
        perror("connect");
    }

    int len;
    FILE *fp;
    char path[20];
    gets(path);
    fp=fopen(path, "r");
    char readch;
    int i=0;
    while((readch=fgetc(fp))!=EOF){
        if(i<1024){
            buffer[i]=readch;
            i++;
        }
        else{
            i=0;
            int n=send(clientfd, buffer, 1024, 0);
        }
    }
    fclose(fp);
    if(i!=0) 
        send(clientfd, buffer, i, 0);
    long wordscount;
    recv(clientfd, &wordscount, sizeof(long), 0);
    printf("%ld\n", wordscount);
    close(clientfd);
}

client

#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define MYPORT 175301
pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;
int serverfd, clientfd;
char buffer[BUFSIZ];

void *wc(void *m){
    pthread_mutex_lock( &counter_mutex );
    int len, i;
    long wordscount=0;
    int flag=1;
    while(1){
        if((len=recv(clientfd, buffer, 1024, 0))>0){
            for(i=0; i