• 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。

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  • 原文地址:https://www.cnblogs.com/DLuob/p/11923218.html
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