2019-2020-1 20175335 20175303 20175304 20275327 实验三 并发程序

2019-2020-1 20175335 20175303 20175304 20275327 实验三 并发程序

小组成员：

 20175335、20175303、20175304、20175327

实验目的：
并发程序

一、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

实验过程

wc功能：统计指定文件中的字节数、字数、行数，并将统计结果显示输出。

wc参数：

-c 统计字节数。

-l 统计行数。

-m 统计字符数。

-w 统计字数。

-L 打印最长行的长度。

socket编程模型：

实验代码如下：

server.c服务器

#include<netinet/in.h>  // sockaddr_in  
#include<sys/types.h>   // socket  
#include<sys/socket.h>  // socket  
#include<stdio.h>       // printf  
#include<stdlib.h>      // exit  
#include<string.h>      // bzero  

#define SERVER_PORT 175335
#define LENGTH_OF_LISTEN_QUEUE 20  
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512  



int main(void)  

{    

    struct sockaddr_in server_addr;  
    bzero(&server_addr, sizeof(server_addr));  
    server_addr.sin_family = AF_INET;  
    server_addr.sin_addr.s_addr = htons(INADDR_ANY);  
    server_addr.sin_port = htons(SERVER_PORT);  
  
    int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);  
    if(server_socket_fd < 0)  
    {  
        perror("Create Socket Failed:");  
        exit(1);  
    }  
    int opt = 1;  
    setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));  

    if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))  
    {  
        perror("Server Bind Failed:");  
        exit(1);  
    }  

    if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))  
    {  
        perror("Server Listen Failed:");  
        exit(1);  
    }  
    while(1)  
    {  

        struct sockaddr_in client_addr;  
        socklen_t client_addr_length = sizeof(client_addr);  

        int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);  
        if(new_server_socket_fd < 0)  
        {  
            perror("Server Accept Failed:");  
            break;  
        }  
        char buffer[BUFFER_SIZE];  
        bzero(buffer, BUFFER_SIZE);  
        if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
        {  
            perror("Server Recieve Data Failed:");  
            break;  
        }  
        char file_name[FILE_NAME_MAX_SIZE+1];  
        bzero(file_name, FILE_NAME_MAX_SIZE+1);  
        strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));  
        printf("%s
", file_name);  
        FILE *fp = fopen(file_name, "w");  
        if(NULL == fp)  
        {  
            printf("File:	%s Can Not Open To Write
", file_name);  
            exit(1);  
        }  

        bzero(buffer, BUFFER_SIZE);  
        int length = 0;  
        while((length = recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)  
        {  
        if(strcmp(buffer,"OK")==0) break;
            if(fwrite(buffer, sizeof(char), length, fp) < length)  
            {  
                printf("File:	%s Write Failed
", file_name);  
                break;  
            }  
            bzero(buffer, BUFFER_SIZE);  
        }  
        printf("	%s 接收成功
", file_name);  
        fclose(fp);
    int words=0;
    char s[100];
    FILE *fp2;
    if((fp2=fopen(file_name,"r"))==NULL){
        printf("文件打开失败!
");
        exit(0);
    }
    while(fscanf(fp2,"%s",s)!=EOF)
        words++;
    fclose(fp2);
    sprintf(buffer,"%d",words);
    send(new_server_socket_fd,buffer,BUFFER_SIZE,0);
    close(new_server_socket_fd);  
    }  
    close(server_socket_fd);  
    return 0;  
}

　　

client.c客户端

#include<netinet/in.h>   // sockaddr_in  
#include<sys/types.h>    // socket  
#include<sys/socket.h>   // socket  
#include<stdio.h>        // printf  
#include<stdlib.h>       // exit  
#include<string.h>       // bzero  

#define SERVER_PORT 175335 
#define BUFFER_SIZE 1024  
#define FILE_NAME_MAX_SIZE 512  

int main()  
{  
    // 声明并初始化一个客户端的socket地址结构  
    struct sockaddr_in client_addr;  
    bzero(&client_addr, sizeof(client_addr));  
    client_addr.sin_family = AF_INET;  
    client_addr.sin_addr.s_addr = htons(INADDR_ANY);  
    client_addr.sin_port = htons(0);  

    // 创建socket，若成功，返回socket描述符  
    int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);  
    if(client_socket_fd < 0)  
    {  
        perror("Create Socket Failed:");  
        exit(1);  
    }  

    // 绑定客户端的socket和客户端的socket地址结构 非必需  
    if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))  
    {  
        perror("Client Bind Failed:");  
        exit(1);  
    }  

    // 声明一个服务器端的socket地址结构，并用服务器那边的IP地址及端口对其进行初始化，用于后面的连接  
    struct sockaddr_in server_addr;  
    bzero(&server_addr, sizeof(server_addr));  
    server_addr.sin_family = AF_INET;  
    if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)  
    {  
        perror("Server IP Address Error:");  
        exit(1);  
    }  
    server_addr.sin_port = htons(SERVER_PORT);  
    socklen_t server_addr_length = sizeof(server_addr);  

    // 向服务器发起连接，连接成功后client_socket_fd代表了客户端和服务器的一个socket连接  
    if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)  
    {  
        perror("Can Not Connect To Server IP:");  
        exit(0);  
    }  

    // 输入文件名，并放到缓冲区buffer中等待发送  
    char file_name[FILE_NAME_MAX_SIZE+1];  
    bzero(file_name, FILE_NAME_MAX_SIZE+1);  

    printf("请输入文件名:");
    scanf("%s", file_name);  

    char buffer[BUFFER_SIZE];  
    bzero(buffer, BUFFER_SIZE);  
    strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));  

    // 向服务器发送buffer中的数据  
    if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
    {  
        perror("Send File Name Failed:");  
        exit(1);  
    }  


    // 打开文件并读取文件数据  
        FILE *fp = fopen(file_name, "r");  
        if(NULL == fp)  
        {  
            printf("File:%s Not Found
", file_name);  
        }  
        else  
        {  
            bzero(buffer, BUFFER_SIZE);  
            int length = 0;  
            // 每读取一段数据，便将其发送给服务器，循环直到文件读完为止  
            while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)  
            {  
                if(send(client_socket_fd, buffer, length, 0) < 0)  
                {  
                    printf("Send File:%s Failed./n", file_name);  
                    break;  
                }  
                bzero(buffer, BUFFER_SIZE);  
            }  

            // 关闭文件  

            fclose(fp);  
            printf("%s 传输成功
", file_name);  
        char s[50]; 
        scanf("%s",s);
        send(client_socket_fd,"OK",BUFFER_SIZE,0);
        recv(client_socket_fd,buffer,BUFFER_SIZE,0);    
        printf("%d %s
",atoi(buffer),file_name);

}
    close(client_socket_fd);  
    return 0;  
} 

　　

实验结果如下： 

 

二、实验三-并发程序-2

实验内容及要求：

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。

实验过程：

多线程的优点：

(1)多线程技术使程序的响应速度更快 ,因为用户界面可以在进行其它工作的同时一直处于活动状态;

(2)当前没有进行处理的任务时可以将处理器时间让给其它任务;

(3)占用大量处理时间的任务可以定期将处理器时间让给其它任务;

(4)可以随时停止任务;

(5)可以分别设置各个任务的优先级以优化性能。

(6)多线程一定程度上提高响应速度，在多核的情况下更能充分利用CPU资源。

实验结果：

thread_client.c

#include<stdlib.h>
#include<sys/socket.h>
#include<sys/types.h>       //pthread_t , pthread_attr_t and so on.
#include<stdio.h>
#include<netinet/in.h>      //structure sockaddr_in
#include<arpa/inet.h>       //Func : htonl; htons; ntohl; ntohs
#include<assert.h>          //Func :assert
#include<string.h>          //Func :memset bzero
#include<unistd.h>          //Func :close,write,read
#define SOCK_PORT 9988
#define BUFFER_LENGTH 1024
int main()
{
    int sockfd;
    int tempfd;
    struct sockaddr_in s_addr_in;
    char data_send[BUFFER_LENGTH];
    char data_recv[BUFFER_LENGTH];
    memset(data_send,0,BUFFER_LENGTH);
    memset(data_recv,0,BUFFER_LENGTH);
    sockfd = socket(AF_INET,SOCK_STREAM,0);       //ipv4,TCP
    if(sockfd == -1)
    {
        fprintf(stderr,"socket error!
");
        exit(1);
    }
    //before func connect, set the attr of structure sockaddr.
    memset(&s_addr_in,0,sizeof(s_addr_in));
    s_addr_in.sin_addr.s_addr = inet_addr("127.0.0.1");      //trans char * to in_addr_t
    s_addr_in.sin_family = AF_INET;
    s_addr_in.sin_port = htons(SOCK_PORT);
    tempfd = connect(sockfd,(struct sockaddr *)(&s_addr_in),sizeof(s_addr_in));
    if(tempfd == -1)
    {
        fprintf(stderr,"Connect error! 
");
        exit(1);
    }
    while(1)
    {
        printf("Please Input File Name On Server(input "quit" to quit):	");
    scanf("%s", data_send);        
    //gets(data_send);
        //scanf("%[^
]",data_send);         //or you can also use this
        tempfd = write(sockfd,data_send,BUFFER_LENGTH);
        if(tempfd == -1)
        {
            fprintf(stderr,"write error
");
            exit(0);
        }

        if(strcmp(data_send,"quit") == 0)  //quit,write the quit request and shutdown client
        {
            break;
        }
        else
        {
            tempfd = read(sockfd,data_recv,BUFFER_LENGTH);
            assert(tempfd != -1);
            printf("%s
",data_recv);
            memset(data_send,0,BUFFER_LENGTH);
            memset(data_recv,0,BUFFER_LENGTH);
        }
    char buffer[BUFFER_LENGTH];
    int length=0;
    bzero(buffer, BUFFER_LENGTH);
        length = recv(sockfd, buffer, BUFFER_LENGTH, 0);
        buffer[length] = '';
        printf("count=%s
", buffer);
        bzero(buffer, BUFFER_LENGTH);
    }
    int ret = shutdown(sockfd,SHUT_WR);       //or you can use func close()--<unistd.h> to close the fd
    assert(ret != -1);
    return 0;
}

thread_server.c

#include<stdlib.h>
#include<pthread.h>
#include<sys/socket.h>
#include<sys/types.h>       //pthread_t , pthread_attr_t and so on.
#include<stdio.h>
#include<netinet/in.h>      //structure sockaddr_in
#include<arpa/inet.h>       //Func : htonl; htons; ntohl; ntohs
#include<assert.h>          //Func :assert
#include<string.h>          //Func :memset bzero
#include<unistd.h>          //Func :close,write,read
#define SOCK_PORT 9988
#define BUFFER_LENGTH 1024
#define MAX_CONN_LIMIT 512     //MAX connection limit
static void Data_handle(void * sock_fd);   //Only can be seen in the file
int CountWordsOfEuropeanTxtFile(char *szFileName);
int CountWordsInOneLine(const char *szLine);
int main()
{
    int sockfd_server;
    int sockfd;
    int fd_temp;
    struct sockaddr_in s_addr_in;
    struct sockaddr_in s_addr_client;
    int client_length;
    sockfd_server = socket(AF_INET,SOCK_STREAM,0);  //ipv4,TCP
    assert(sockfd_server != -1);
    //before bind(), set the attr of structure sockaddr.
    memset(&s_addr_in,0,sizeof(s_addr_in));
    s_addr_in.sin_family = AF_INET;
    s_addr_in.sin_addr.s_addr = htonl(INADDR_ANY);  //trans addr from uint32_t host byte order to network byte order.
    s_addr_in.sin_port = htons(SOCK_PORT);          //trans port from uint16_t host byte order to network byte order.
    fd_temp = bind(sockfd_server,(const struct sockaddr *)(&s_addr_in),sizeof(s_addr_in));
    if(fd_temp == -1)
    {
        fprintf(stderr,"bind error!
");
        exit(1);
    }
    fd_temp = listen(sockfd_server,MAX_CONN_LIMIT);
    if(fd_temp == -1)
    {
        fprintf(stderr,"listen error!
");
        exit(1);
    }
    while(1)
    {
        printf("waiting for new connection...
");
        pthread_t thread_id;
        client_length = sizeof(s_addr_client);
        //Block here. Until server accpets a new connection.
        sockfd = accept(sockfd_server,(struct sockaddr * restrict)(&s_addr_client),(socklen_t *)(&client_length));
        if(sockfd == -1)
        {
            fprintf(stderr,"Accept error!
");
            continue;                               //ignore current socket ,continue while loop.
        }
        printf("A new connection occurs!
");
        if(pthread_create(&thread_id,NULL,(void *)(&Data_handle),(void *)(&sockfd)) == -1)
        {
            fprintf(stderr,"pthread_create error!
");
            break;                                  //break while loop
        }
    }
    //Clear
    int ret = shutdown(sockfd_server,SHUT_WR); //shut down the all or part of a full-duplex connection.
    assert(ret != -1);
    printf("Server shuts down
");
    return 0;
}
static void Data_handle(void * sock_fd)
{
    int fd = *((int *)sock_fd);
    int i_recvBytes;
    char data_recv[BUFFER_LENGTH];
    const char * data_send = "Server has received your request!
";
    while(1)
    {
        printf("waiting for file_name...
");
        //Reset data.
        memset(data_recv,0,BUFFER_LENGTH);
        i_recvBytes = read(fd,data_recv,BUFFER_LENGTH);
        if(i_recvBytes == 0)
        {
            printf("Maybe the client has closed
");
            break;
        }
        if(i_recvBytes == -1)
        {
            fprintf(stderr,"read error!
");
            break;
        }
        if(strcmp(data_recv,"quit")==0)
        {
            printf("Quit command!
");
            break;                           //Break the while loop.
        }
        printf("read from client : %s
",data_recv);
        
    char buffer[BUFFER_LENGTH];
    int count=0;
    bzero(buffer, BUFFER_LENGTH);
    count = CountWordsOfEuropeanTxtFile(data_recv);
    sprintf(buffer,"%d", count);
        send(fd, buffer, sizeof(buffer), 0);
        if(write(fd,data_send,strlen(data_send)) == -1)
        {
            break;
        }
    }
    //Clear
    printf("terminating current client_connection...
");
    close(fd);            //close a file descriptor.
    pthread_exit(NULL);   //terminate calling thread!
}
int CountWordsOfEuropeanTxtFile(char *szFileName)
{
    int nWords = 0;//词计数变量，初始值为0
    FILE *fp; //文件指针
    char carrBuffer[1024];//每行字符缓冲，每行最多1024个字符
    //打开文件
    if ((fp = fopen(szFileName,  "r")) == NULL)
    {
        return -1;  //文件打开不成功是返回-1
    }
    while (!feof(fp))//如果没有读到文件末尾 
    {
        //从文件中读一行
        if (fgets(carrBuffer, sizeof(carrBuffer),fp) != NULL)
            //统计每行词数
            nWords += CountWordsInOneLine(carrBuffer);
    }

    //关闭文件
    fclose(fp);
    return nWords;
}
int CountWordsInOneLine(const char *szLine)
{
    int nWords = 0;
    int i=0;
    for (;i<strlen(szLine);i++)
    {
        if (*(szLine+i)!=' ')
        {
            nWords++;
            while ((*(szLine+i)!=' ')&&(*(szLine+i)!=''))
            {
                i++;
            }
        }

    }
            //printf("%d	",nWords);
    
    return nWords;
}

实验截图：

三、实验三-并发程序-3

一、实验内容：

1.交叉编译多线程版本服务器并部署到实验箱中
2.PC机作客户端测试wc服务器。

二、实验步骤：
1.参考实验1在Ubuntu中对服务器代码交叉编译。
2.将实验箱与电脑连接好，配置好网络模式并能ping通；
3.打开虚拟机命令行终端，配置/etc/exports；
sudo vim /etc/exports
NFS允许挂载的目录及权限在文件/etc/exports中进行了定义。需要把/home/linux/175204zyz/sy3目录共享出来，那么我们只需要在/etc/exports文件末添加如下一行：
/home/linux/175204zyz/sy3 *(rw,sync,no_root_squash,no_subtree_check)
保存并推出，随后重启服务：
sudo /etc/init.d/nfs-kernel-server restart
4.在超级终端中mount -t nfs -o nolock 192.168.0.230（宿主机IP）:/home/linux/175204zyz/sy3；
5.然后运行程序。

三、实验截图

超级终端：

 

四、实验里遇到的困难及解决办法：

• 问题1：Fatal error: stdafx.h : No such file or directory

• 问题1解决办法：建工程自带，将其删除即可；或者是手动添加头文件
  

• 问题2:
• 

• 问题2 解决办法：pthread并非linux系统默认的库，编译时需要引入pthread，可在编译时加入-lpthread来完成。

• 问题3:在使用超级终端时无法ping通。
• 问题3 的解决办法：1、关闭防火墙和打开本地网络连接。

  　　　　　            2、勾选本地连接属性里的VMware Bridge Protocol（百度）。

    　　　　             3、关闭本机的WLAN连接，将虚拟机设置里的网络适配器选择为桥接模式。