• 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


    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 <stdio.h>  
    #include <sys/types.h>  
    #include <sys/socket.h>  
    #include <netinet/in.h>  
    #include <arpa/inet.h>  
    #include <string.h>
    
    #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
    ", wordscount);
        close(clientfd);
    }
    

    client

    #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>
    
    #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<len; i++){
                    if(flag==0){
                        switch(buffer[i]){
                            case ' ':
                                wordscount++;
                                break;
                            case '
    ':
                                wordscount++;
                                break;
                            case '
    ':
                                wordscount++;
                                break;
                            default:
                                break;
                        }
                    }
                    if(buffer[i]== ' ' || buffer[i]=='
    ' || buffer[i]=='
    ') 
                        flag=1;
                    else 
                        flag=0;
                }
            }
            if(len<1024) 
                break;
        }
        send(clientfd, &wordscount, sizeof(long), 0);
        close(clientfd);
        pthread_mutex_unlock( &counter_mutex );
        return NULL;
    }
    void main(){
        pthread_t t;
        char arg[30];
    
        struct sockaddr_in my_addr;
        struct sockaddr_in remote_addr;
    
        memset(&my_addr, 0, sizeof(my_addr));
        my_addr.sin_family=AF_INET;
        my_addr.sin_addr.s_addr=INADDR_ANY;
        my_addr.sin_port=htons(MYPORT);
    
        if((serverfd=socket(PF_INET, SOCK_STREAM, 0))==-1){
            perror("socket");
        }
    
        if(bind(serverfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))<0){
            perror("bind");
        }
        listen(serverfd, 5);
        int addrlen=sizeof(struct sockaddr_in);
        while(1){
            if((clientfd=accept(serverfd, (struct sockaddr *)&remote_addr, &addrlen))<0){
                perror("accept");
            }
       
    }
    

    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 <stdio.h>  
    #include <sys/types.h>  
    #include <sys/socket.h>  
    #include <netinet/in.h>  
    #include <arpa/inet.h>  
    #include <string.h>
    
    #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
    ", wordscount);
        close(clientfd);
    }
    

    client

    #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>
    
    #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<len; i++){
                    if(flag==0){
                        switch(buffer[i]){
                            case ' ':
                                wordscount++;
                                break;
                            case '
    ':
                                wordscount++;
                                break;
                            case '
    ':
                                wordscount++;
                                break;
                            default:
                                break;
                        }
                    }
                    if(buffer[i]== ' ' || buffer[i]=='
    ' || buffer[i]=='
    ') 
                        flag=1;
                    else 
                        flag=0;
                }
            }
            if(len<1024) 
                break;
        }
        send(clientfd, &wordscount, sizeof(long), 0);
        close(clientfd);
        pthread_mutex_unlock( &counter_mutex );
        return NULL;
    }
    void main(){
        pthread_t t;
        char arg[30];
    
        struct sockaddr_in my_addr;
        struct sockaddr_in remote_addr;
    
        memset(&my_addr, 0, sizeof(my_addr));
        my_addr.sin_family=AF_INET;
        my_addr.sin_addr.s_addr=INADDR_ANY;
        my_addr.sin_port=htons(MYPORT);
    
        if((serverfd=socket(PF_INET, SOCK_STREAM, 0))==-1){
            perror("socket");
        }
    
        if(bind(serverfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))<0){
            perror("bind");
        }
        listen(serverfd, 5);
        int addrlen=sizeof(struct sockaddr_in);
        while(1){
            if((clientfd=accept(serverfd, (struct sockaddr *)&remote_addr, &addrlen))<0){
                perror("accept");
            }
       
    }
    

    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 <stdio.h>  
    #include <sys/types.h>  
    #include <sys/socket.h>  
    #include <netinet/in.h>  
    #include <arpa/inet.h>  
    #include <string.h>
    
    #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
    ", wordscount);
        close(clientfd);
    }
    

    client

    #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>
    
    #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<len; i++){
                    if(flag==0){
                        switch(buffer[i]){
                            case ' ':
                                wordscount++;
                                break;
                            case '
    ':
                                wordscount++;
                                break;
                            case '
    ':
                                wordscount++;
                                break;
                            default:
                                break;
                        }
                    }
                    if(buffer[i]== ' ' || buffer[i]=='
    ' || buffer[i]=='
    ') 
                        flag=1;
                    else 
                        flag=0;
                }
            }
            if(len<1024) 
                break;
        }
        send(clientfd, &wordscount, sizeof(long), 0);
        close(clientfd);
        pthread_mutex_unlock( &counter_mutex );
        return NULL;
    }
    void main(){
        pthread_t t;
        char arg[30];
    
        struct sockaddr_in my_addr;
        struct sockaddr_in remote_addr;
    
        memset(&my_addr, 0, sizeof(my_addr));
        my_addr.sin_family=AF_INET;
        my_addr.sin_addr.s_addr=INADDR_ANY;
        my_addr.sin_port=htons(MYPORT);
    
        if((serverfd=socket(PF_INET, SOCK_STREAM, 0))==-1){
            perror("socket");
        }
    
        if(bind(serverfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr))<0){
            perror("bind");
        }
        listen(serverfd, 5);
        int addrlen=sizeof(struct sockaddr_in);
        while(1){
            if((clientfd=accept(serverfd, (struct sockaddr *)&remote_addr, &addrlen))<0){
                perror("accept");
            }
       
    }
    
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  • 原文地址:https://www.cnblogs.com/zhangtianyu/p/11924512.html
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