2018-2019 20165216 实验三 并发程序

2018-2019 20165216《信息安全系统设计基础》实验三 并发程序

实验三-并发程序-1

任务详情

  • 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
    服务器返回文本文件中的单词数

  • 上传代码并至少测试附件中的二个文件

实验步骤

使用man -k wc查找相关命令
继续使用man 1 wc查找相关指令

代码展示 serve.c

#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 165216  
#define LENGTH_OF_LISTEN_QUEUE 20  
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512  

int main(void)  
{  
    // 声明并初始化一个服务器端的socket地址结构  
    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);  

    // 创建socket,若成功,返回socket描述符  
    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));  

    // 绑定socket和socket地址结构  
    if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))  
    {  
        perror("Server Bind Failed:");  
        exit(1);  
    }  

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

    while(1)  
    {  
        // 定义客户端的socket地址结构  
        struct sockaddr_in client_addr;  
        socklen_t client_addr_length = sizeof(client_addr);  

        // 接受连接请求,返回一个新的socket(描述符),这个新socket用于同连接的客户端通信  
        // accept函数会把连接到的客户端信息写到client_addr中  
        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;  
        }  

       // recv函数接收数据到缓冲区buffer中  
        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;  
        }  

        // 然后从buffer(缓冲区)拷贝到file_name中  
        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\n", file_name);  

    // 打开文件,准备写入  
        FILE *fp = fopen(file_name, "w");  
        if(NULL == fp)  
        {  
            printf("File:\t%s Can Not Open To Write\n", file_name);  
            exit(1);  
        }  

    // 从客户端接收数据到buffer中  
        // 每接收一段数据,便将其写入文件中,循环直到文件接收完并写完为止  
        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:\t%s Write Failed\n", file_name);  
                break;  
            }  
            bzero(buffer, BUFFER_SIZE);  
        }  


    // 接收成功后,关闭文件,关闭socket  
        printf("Receive File:\t%s From Client IP Successful!\n", file_name);  
        fclose(fp);


    // 统计文件单词个数,并发送给客户端
    int words=0;
    char s[100];
    FILE *fp2;
    if((fp2=fopen(file_name,"r"))==NULL){
        printf("ERROR!\n");
        exit(0);
    }
    while(fscanf(fp2,"%s",s)!=EOF)
        words++;
    fclose(fp2);
    //printf("%d words.\n",words);


    sprintf(buffer,"%d",words);

    send(new_server_socket_fd,buffer,BUFFER_SIZE,0);

    //send(new_server_socket_fd,&words,sizeof(words),0);
    close(new_server_socket_fd);  



        // 关闭与客户端的连接  

    }  
    // 关闭监听用的socket  
    close(server_socket_fd);  
    return 0;  
} 

client.c

#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 165216 
#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("Please Input File Name On Client:\t");
    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\n", 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("File:%s Transfer Successful!\n", 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 words.\n",atoi(buffer));
    }  

    close(client_socket_fd);  
    return 0;  
} 

运行截图

 

实验三-并发程序-2

任务详情

  • 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

代码展示

serve2.c

 

#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define PORT 165216
#define BUFF_SIZE 1024
#define LISTEN_SIZE 20
typedef struct{
    char type;
    char data[BUFF_SIZE];
}m_package;

void* process_client();

int main(){
    int ss = create_tcp_server(PORT);
    if(-1 == ss)
        exit(-1);
    while(1){
        //接受客户端连接
        socklen_t addrlen = sizeof(struct sockaddr);
        struct sockaddr_in client_addr; //客户端地址结构
        int client_sock = accept(ss, (struct sockaddr*)&client_addr, &addrlen);
        if(client_sock < 0){
            printf("accept error\n");
        }
        printf("accept success\n");

        pthread_t pid;
        if(pthread_create(&pid, NULL, process_client, &client_sock) < 0){
            printf("pthread_create error\n");
        }
    }
}

//处理客户端程序
void *process_client(void *arg){
    int size = 0, fd, count = 0, sockid = *(int*)arg;
    m_package pac;
    long total = 0, cur = 0;
    //循环接收文件
    while(1) {
        memset(&pac, 0, sizeof(pac));
        size = read(sockid, &pac, sizeof(pac));
        if(size > 0){
            if (pac.type == 1){
                fd = open(pac.data, O_CREAT|O_WRONLY, 0777);
                if(-1 == fd){
                    printf("open file error!\n");
                    continue;
                }
                count = total = cur = 0;
            }
            else if (pac.type == 2){
                cur += write(fd, pac.data, strlen(pac.data));
                if(count++ % 5000 == 0){
                    printf("recv from client < %d > : %.01lf\%\n", sockid, cur * 100.0 / total);
                    count = 0;
                }
            }
            else if (pac.type == 3){
                printf("recv from client < %d > : 100.0\%\n", sockid);
                printf("recv success\n");
                close(fd);
            }
            else if(pac.type == 4){//文件长度
                total = strtol(pac.data, NULL, 10);
                printf("%ld\n", total);
            }
        }else{
            printf("client disconnected\n");
            close(sockid);
            break;
        }
    }
    return 0;
}
int start_server(int port, int type){
    //建立服务器套接字
    int ss = socket(AF_INET, type, 0);
    if(ss < 0){
        printf("create socket error\n");
        return -1;
    }

    //设置服务器地址
    struct sockaddr_in server_addr;	//服务器地址结构
    bzero(&server_addr, sizeof(struct sockaddr_in)); //清零
    server_addr.sin_family = AF_INET; //协议族
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY); //ip地址
    server_addr.sin_port = htons(port); //端口
    //绑定地址结构到套接字描述符
    if(bind(ss, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0){
        printf("bind error\n");
        return -1;
    }
    //TCP
    if(SOCK_STREAM == type){
        //设置侦听
        if(listen(ss, LISTEN_SIZE) < 0){
            printf("listen error\n");
            return -1;
        }
        printf("tcp server start\n");
    }
    else
        printf("udp server start\n");
    return ss;
}

int create_tcp_server(int port){
    start_server(port, SOCK_STREAM);
}

int create_udp_server(int port){
    start_server(port, SOCK_DGRAM);
}

 

  

 

client2.c

 

#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define PORT 165216
#define BUFF_SIZE 1024
#define LISTEN_SIZE 20
typedef struct{
    char type;
    char data[BUFF_SIZE];
}m_package;

int main(){
    //创建连接
    int sock_fd = connect_tcp("127.0.0.1", PORT);
    if(-1 == sock_fd)
        return -1;

    m_package pac;
    int fd, cur = 0, count = 0;
    long filesize = 0;
    while(1){
        //打开文件
        memset(&pac, 0, sizeof(pac));
        pac.type = 1;
        // strcpy(pac.data, "/home/SKZH/a.txt");
        scanf("%s", pac.data);
        //获取文件信息
        struct stat sfile;
        stat(pac.data, &sfile );
        filesize = sfile.st_size;
        time_t t;
        long begin = time(&t);
        cur = count = 0;

        fd = open(pac.data, O_RDONLY);
        if(-1 == fd){
            printf("file open error\n");
            continue;
        }
        //读取文件并发送
        //发送文件名
        strcpy(pac.data, strrchr(pac.data, '/') + 1);
        write(sock_fd, &pac, sizeof(pac));
        memset(&pac, 0, sizeof(pac));

        //发送文件长度
        pac.type = 4;
        sprintf(pac.data,"%ld",filesize);
        write(sock_fd, &pac, sizeof(pac));
        memset(&pac, 0, sizeof(pac));

        int read_len = 0;
        while((read_len = read(fd, pac.data, BUFF_SIZE)) > 0){
            pac.type = 2;
            write(sock_fd, &pac, sizeof(pac));
            memset(&pac, 0, sizeof(pac));
            cur += read_len;
            if(count++ % 5000 == 0){
                count = 0;
                printf("send to server : %.1lf\%\n", cur * 100.0 / filesize);
            }
        }

        //发送结束标记
        memset(&pac, 3, sizeof(pac));
        write(sock_fd, &pac, BUFF_SIZE + 1);
        close(fd);

        printf("send to server : 100.0\%\n");
        printf("file size : %d B\n", filesize);
        printf("time : %ld ms\n", time(&t) - begin);
        printf("send file success\n");
        printf("------------------------\n");
    }
    close(sock_fd);
}
int connectsock(char* server_ip, int server_port, int type){
    int sock_fd = socket(AF_INET, type, 0);
    if(-1 == sock_fd){
        printf("create socket error\n");
        return -1;
    }

    struct sockaddr_in server_addr;
    //设置服务器地址
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(server_port);
    inet_pton(AF_INET, server_ip, &server_addr.sin_addr);

    //连接服务器
    if(-1 == connect(sock_fd, (struct sockaddr*)&server_addr, sizeof(struct sockaddr_in))){
        printf("connect server error\n");
        return -1;
    }

    printf("connect server success\n");
    return sock_fd;
}

int connect_tcp(char* server_ip, int server_port){
    return connectsock(server_ip, server_port, SOCK_STREAM);
}

int connect_udp(char* server_ip, int server_port){
    return connectsock(server_ip, server_port, SOCK_DGRAM);
}

 

  

 

运行截图

对比单线程的性能,并分析原因

线程是程序中的一个执行流,每个线程都有自己的专有寄存器(栈指针、程序计数器等),但代码区是共享的。而多线程,则是多个执行流的意思。而这样做的好处是显而易见的,它可以将任务的多个部分分给不同线程,各自的完成自己的任务,增加时间效率,而单线程必须在上一任务完成的情况下才能进行下个任务。

而且,多线程还可以提升CPU的利用率,假如顺序完成任务中的一环需要占用的CPU是10%,那么剩下的90%就可以说是浪费了,而多线程能够提升这个利用率。

当然,线程越多并不是越好,如果希望通过多线程执行任务让程序运行得更快,会面临非常多的挑战,比如上下文切换的问题、死锁的问题,以及受限于硬件和软件的资源限制问题.

就上下文切换来说,cpu以很高的频率进行线程的切换而分配给线程,让我们感觉是同时进行的,假如任务简单而我们又分配多线程,其中的协调所用的资源反而会更多。

这个就如同电脑核心一般,电脑的核心并不是越多越好,就拿游戏说,现在的游戏优化大多以双核以及四核为核心,多的核心反而浪费,假如你有10个核心,玩个1核优化的游戏,那就真的是“一核有难,九核围观”了。

posted @ 2018-11-14 17:52  许愿神王  阅读(185)  评论(0编辑  收藏  举报