2019-2020-1-20175332-实验三：并发程序

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

代码实现：
代码如下：

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]){
    int count=0;
    char w[100];
    FILE *fp;
    if((fp=fopen(argv[1],"r"))==NULL){
        printf("文件打开失败
");
        exit(0);
    }
    while(fscanf(fp,"%s",w)!=EOF){
        count++;
        }
    printf("%d %s 
",count,argv[1]);
    fclose(fp);
    return 0;
}

Socket通信过程

server

  #include <stdio.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #include <string.h>
  #include <pthread.h>
  #pragma comment(lib,"ws2_32.lib")
  pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;

  #define MY_PORT 175332

  typedef struct socket_counter
{
    SOCKET send_socket;
    char buffer[1024];
}socket_counter;
void my_wc(socket_counter *my_counter);
int main()
{
    SOCKET listen_socket;//声明Socket接口变量
    struct sockaddr_in my_addr;//声明Socket地址变量
    int dummy,rev_length;
    //char buffer[1024];
    char file_name[100];
    pthread_t t;
    socket_counter *my_counter;

    WSADATA wsaDate;

    WSAStartup(MAKEWORD(1,1),&wsaDate);//启动版本

    listen_socket=socket(AF_INET,SOCK_STREAM,0);//声明为IPV4的TCP

    my_addr.sin_family=AF_INET;//IPV4
    my_addr.sin_port=htons(MY_PORT);//端口
    my_addr.sin_addr.s_addr=htonl(INADDR_ANY);//可以连接任一电脑

    dummy = sizeof(SOCKADDR);
    memset(file_name,0,sizeof(file_name));

    if( bind(listen_socket,(struct sockaddr*)&my_addr,sizeof(struct sockaddr))<0)//绑定本地IP与Socket
    {
       printf("Server Bind error!
");
    }

    if(listen(listen_socket,5)<0)//等待序列，默认队列最多为5个请求
    {
        printf("Server Listen error!
");
    }

    while(1)
    {
        my_counter->send_socket=accept(listen_socket,NULL,&dummy);//listen函数创建等待队列后，accept函数处理客户端发来的连接请求
        if(my_counter->send_socket==-1)
        {
            printf("Server Accept failed!
");
            break;
        }
        printf("Accept success!
");
        pthread_create(&t, NULL, &my_wc,my_counter);
        pthread_join(&t, NULL);
    }
    closesocket(listen_socket);//依次关闭连接
    WSACleanup();//清除
    return 0;
}
void my_wc(socket_counter *my_counter){
    pthread_mutex_lock( &counter_mutex );
    int len, i;
    long wordscount=0;
    int flag=1;
    while(1)
    {
        if((len=recv(my_counter->send_socket, my_counter->buffer, 1024, 0))>0)
        {
            for(i=0; i<len; i++)
            {
                if(flag==0)
                {
                    switch(my_counter->buffer[i])
                    {
                        case ' ':
                            wordscount++;
                            break;
                        case '
':
                            wordscount++;
                            break;
                        case '
':
                            wordscount++;
                            break;
                        default:
                            break;
                    }
                }
                if(my_counter->buffer[i]== ' ' || my_counter->buffer[i]=='
' || my_counter->buffer[i]=='
')
                    flag=1;
                else
                    flag=0;
            }
        }
        if(len<1024) break;
    }
    send(my_counter->send_socket, &wordscount, sizeof(long), 0);
    close(my_counter->send_socket);
    pthread_mutex_unlock( &counter_mutex );
}

client

 #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 175332  
 #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;  
}

运行

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 - 学习使用Linux命令wc(1)
  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。
  serve

#include<netinet/in.h>   
#include<sys/types.h>   
#include<sys/socket.h>   
#include<stdio.h>   
#include<stdlib.h>   
#include<string.h>   
#include<pthread.h>  
#define HELLO_WORLD_SERVER_PORT    175332  
#define LENGTH_OF_LISTEN_QUEUE     20  
#define BUFFER_SIZE                1024  
#define FILE_NAME_MAX_SIZE         512  
void *process_client(void *new_server_socket);
int mywc(char file_name[])
{
    char ch;
    int flag=0,num=0;
    int choose=1;
    FILE *fp;

    scanf("%d",&choose);
    if((fp = fopen(file_name,"r"))==NULL)
    {
        printf("Failure to open %s
",file_name);
        exit(0);
    }

    while((ch=fgetc(fp))!=EOF)
    {
        if(ch==' ' || ch=='
' || ch=='	' ||  ch=='!' || ch=='?' || ch=='"' || ch=='.' || ch== '\,' || ch==':' || ch=='(' || ch==')' || ch==';' || ch=='-')
        {
            flag=0;
        }
        else
        {
            if(flag==0)
            {
                flag=1;
                num++;
            }
        }              
    }
    printf("%d %s
",num,file_name);
    fclose(fp);
    return num;
}
int main(int argc, char **argv)  
{  
 
// 设置一个socket地址结构server_addr,代表服务器internet的地址和端口  
    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(HELLO_WORLD_SERVER_PORT);  
 
// 创建用于internet的流协议(TCP)socket，用server_socket代表服务器向客户端提供服务的接口  
    int server_socket = socket(PF_INET, SOCK_STREAM, 0);  
    if (server_socket < 0)  
    {  
        printf("Create Socket Failed!
");  
        exit(1);  
    }  

// 把socket和socket地址结构绑定   
    if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))  
    {  
        printf("Server Bind Port: %d Failed!
", HELLO_WORLD_SERVER_PORT);  
        exit(1);  
    }  

// server_socket用于监听   
    if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))  
    {  
        printf("Server Listen Failed!
");  
        exit(1);  
    }  
// 服务器端一直运行用以持续为客户端提供服务   
      
    while(1)
    {
// 定义客户端的socket地址结构client_addr，当收到来自客户端的请求后，调用accept  
// 接受此请求，同时将client端的地址和端口等信息写入client_addr中  
        struct sockaddr_in client_addr;  
        socklen_t length = sizeof(client_addr);  

// 接受一个从client端到达server端的连接请求,将客户端的信息保存在client_addr中  
// 如果没有连接请求，则一直等待直到有连接请求为止，这是accept函数的特性，可以  
// 用select()来实现超时检测   
// accpet返回一个新的socket,这个socket用来与此次连接到server的client进行通信  
// 这里的new_server_socket代表了这个通信通道  
        int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);  

        if (new_server_socket < 0)  
        {  
            printf("Server Accept Failed!
");  
              
        }
        //添加进程相关代码
        pthread_t pid;
        if(pthread_create(&pid, NULL, process_client,(void *) &new_server_socket) < 0){
              printf("pthread_create error
");
        }
        
    }

}
void *process_client(void *new_server_socket)
{
        int sockid=*(int *)new_server_socket;
        FILE *fp;
        //接受来自客户端的文件
        char buffer[BUFFER_SIZE]; 
        char file_name[FILE_NAME_MAX_SIZE];
        bzero(buffer, sizeof(buffer));  
        int length=0;
        if(recv(sockid,buffer,BUFFER_SIZE, 0)==-1)
        {
            printf("接受文件名%s失败
",buffer);
        }
        strcpy(file_name,buffer);
        strcat(file_name,"-server");
        if((fp = fopen(file_name,"w"))==NULL)
        {
            printf("Failure to open %s
",file_name);
            exit(0);
        }
        while( length = recv(sockid, buffer, BUFFER_SIZE, 0))
        {
            if(length<0)
            {
                printf("接受文件出错
");
                exit(0);
            }
            
            if(fwrite(buffer,sizeof(char),length,fp)<length)
            {
                printf("写文件失败
");
            }
            bzero(buffer, BUFFER_SIZE);
        }
        fclose(fp);
        printf("文件传输成功");
    int number=0;
        number=mywc(file_name);
        bzero(buffer, BUFFER_SIZE);  
        buffer[0]=number+48;
// 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端  
        /*if (send(new_server_socket, buffer, sizeof(buffer), 0) < 0)  
        {  
            printf("Send number Failed!
");  
             
        }  
        printf("发送单词个数完毕
");*/
        bzero(buffer, sizeof(buffer));  
        printf("File Transfer Finished!
");    
        close(new_server_socket);  
}

client

 #include<netinet/in.h>                         // for sockaddr_in  
 #include<sys/types.h>                          // for socket  
 #include<sys/socket.h>                         // for socket  
 #include<stdio.h>                              // for printf  
 #include<stdlib.h>                             // for exit  
 #include<string.h>                             // for bzero  
  
 #define HELLO_WORLD_SERVER_PORT       175332  
 #define BUFFER_SIZE                   1024  
 #define FILE_NAME_MAX_SIZE            512  
 int mywc(char file_name[],int choose);
int main(int argc, char **argv)  
{  
    FILE *fp;
    if (argc != 2)  
    {  
        printf("Usage: ./%s ServerIPAddress
", argv[0]);  
        exit(1);  
    }  

// 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口  
    struct sockaddr_in client_addr;  
    bzero(&client_addr, sizeof(client_addr));  
    client_addr.sin_family = AF_INET; // internet协议族  
    client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址  
    client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口  

// 创建用于internet的流协议(TCP)类型socket，用client_socket代表客户端socket  
    int client_socket = socket(AF_INET, SOCK_STREAM, 0);  
    if (client_socket < 0)  
    {  
        printf("Create Socket Failed!
");  
        exit(1);  
    }  

// 把客户端的socket和客户端的socket地址结构绑定   
    if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))  
    {  
        printf("Client Bind Port Failed!
");  
        exit(1);  
    }  

// 设置一个socket地址结构server_addr,代表服务器的internet地址和端口  
    struct sockaddr_in  server_addr;  
    bzero(&server_addr, sizeof(server_addr));  
    server_addr.sin_family = AF_INET;  

// 服务器的IP地址来自程序的参数   
    if (inet_aton(argv[1], &server_addr.sin_addr) == 0)  
    {  
        printf("Server IP Address Error!
");  
        exit(1);  
    }                                                                                                               
    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);  
    socklen_t server_addr_length = sizeof(server_addr);  
    // 向服务器发起连接请求，连接成功后client_socket代表客户端和服务器端的一个socket连接  
    if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)  
    {  
        printf("Can Not Connect To %s!
", argv[1]);  
        exit(1);  
    }  

    char file_name[FILE_NAME_MAX_SIZE + 1];  
    bzero(file_name, sizeof(file_name));  
    printf("请输入文件名:");  
    scanf("%s", file_name);  
    if((fp = fopen(file_name,"r"))==NULL)
    {
         printf("Failure to open %s
",file_name);
         exit(0);
    }
    
    char buffer[BUFFER_SIZE];  
    bzero(buffer, sizeof(buffer));  
    strcpy(buffer,file_name);
    if(send(client_socket,buffer,BUFFER_SIZE,0)==-1)
    {
        printf("发送文件名失败
");
    }
    char ch;
    int i=0;
    while((ch=fgetc(fp))!=EOF)
    {
        buffer[i++]=ch;
        if(i>=BUFFER_SIZE)
        {
            if((send(client_socket, buffer, BUFFER_SIZE, 0))==-1)
            {
                printf("发送文件失败
");
            }
            bzero(buffer, sizeof(buffer));
            i=0;
        }
    }
    if(i<BUFFER_SIZE)
    {
        if((send(client_socket, buffer, i, 0))==-1)
        {
            printf("发送文件失败
");
        }
    }

    printf("%s传输成功
",file_name);
    mywc(file_name,1);

    // 向服务器发送buffer中的数据，此时buffer中存放的是客户端需要接收的文件 
    //以下接收服务器发来的单词个数
    bzero(buffer, sizeof(buffer));

// 传输完毕，关闭socket   
    
    fclose(fp);  
    close(client_socket);  
    return 0;  

}  
 int mywc(char file_name[],int choose)
  {
       FILE *fp;
       char ch;
        int flag=0,num=0;
            if((fp = fopen(file_name,"r"))==NULL)
             {
                  printf("Failure to open %s
",file_name);
                   exit(0);
                }
             while((ch=fgetc(fp))!=EOF)
                     {
                          if(ch==' ' || ch=='
' || ch=='	' ||  ch=='!' || ch=='?' || ch=='"' || ch=='.' || ch== '\,' || ch==':' || ch=='(' || ch==')' || ch==';'     || ch=='-')
                          {
                          flag=0;
                          }
                          else
                          {
                          if(flag==0)
                          {
                          flag=1;
                          num++;
                          }
                          
                          }

                    }

        printf("%d %s
",num,file_name);        
    fclose(fp);
                return num;
}

实验截图

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