在循环中创建套接字/线程

Question

我正在努力尝试通过 for 循环创建套接字；循环将为每个套接字创建一个线程。

这是我当前运行良好的代码：

输入； ./client1 2344 或 ./client1 2343。 （2344 和 2343 是端口）。

处理套接字，每个都有一个线程：

    struct sockaddr_in serv; /* socket info about our server */
    struct sockaddr_in serv2; /* socket info about our server */
    int mysocket;            /* socket used to listen for incoming connections */
    int mysocket2;

    memset(&serv, 0, sizeof(serv));           /* zero the struct before filling the fields */
    serv.sin_family = AF_INET;                /* set the type of connection to TCP/IP */
    serv.sin_addr.s_addr = htonl(INADDR_ANY); /* set our address to any interface */
    serv.sin_port = htons(PORTNUM);          
    memset(&serv2, 0, sizeof(serv2));           /* zero the struct before filling the fields */
    serv2.sin_family = AF_INET;                /* set the type of connection to TCP/IP */
    serv2.sin_addr.s_addr = htonl(INADDR_ANY); /* set our address to any interface */
    serv2.sin_port = htons(PORTNUM2);           /* set the server port number */
    // see http://stackoverflow.com/questions/15976137/local-host-server-socket-program-not-working

    mysocket = socket(AF_INET, SOCK_STREAM, 0);    
    mysocket2 = socket(AF_INET, SOCK_STREAM, 0);

    int optVal = 1;
    if (setsockopt(mysocket, SOL_SOCKET, SO_REUSEADDR, &optVal, sizeof(int)) < 0) {
        perror("Error setting socket option");
        exit(1);
    }    
    if (setsockopt(mysocket2, SOL_SOCKET, SO_REUSEADDR, &optVal, sizeof(int)) < 0) {
        perror("Error setting socket option");
        exit(1);
    }


    if (bind(mysocket, (struct sockaddr *)&serv, sizeof(struct sockaddr_in))){
        perror("Error binding socket to port");
        exit(1);
    }
    if (bind(mysocket2, (struct sockaddr *)&serv2, sizeof(struct sockaddr_in))){
        perror("Error binding socket to port");
        exit(1);
    }
    /* start listening, allowing a queue of up to 1 pending connection */
    listen(mysocket, SOMAXCONN);
    listen(mysocket2, SOMAXCONN);

    pthread_t inc_x_thread1;
    pthread_t inc_x_thread2;

    pthread_create(&inc_x_thread1, NULL, run, &mysocket);
    pthread_create(&inc_x_thread2, NULL, run, &mysocket2);
    pthread_join(inc_x_thread1, NULL);
    pthread_join(inc_x_thread2, NULL);

以下代码是我尝试在 for 循环中重构代码：

    int socketDeckPair = 0;
    int threads = 2; 
    pthread_t* tid[2];
    char* ports[] = {"2343", "2344"};

    //This is where the information about the incoming connection will
    for(;socketDeckPair < 2; socketDeckPair=socketDeckPair+1){
        struct sockaddr_in serv; /* socket info about our server */

        int mysocket;            /* socket used to listen for incoming connections */

        memset(&serv, 0, sizeof(serv));           /* zero the struct before filling the fields */
        serv.sin_family = AF_INET;                /* set the type of connection to TCP/IP */
        serv.sin_addr.s_addr = htonl(INADDR_ANY); /* set our address to any interface */
        serv.sin_port = htons(atoi(ports[socketDeckPair]));           /* set the server port number */

        mysocket = socket(AF_INET, SOCK_STREAM, 0);

        int optVal = 1;
        if (setsockopt(mysocket, SOL_SOCKET, SO_REUSEADDR, &optVal, sizeof(int)) < 0) {
            perror("Error setting socket option");
            exit(1);
        }

        if (bind(mysocket, (struct sockaddr *)&serv, sizeof(struct sockaddr_in))){
            perror("Error binding socket to port");
            exit(1);
        }

        listen(mysocket, SOMAXCONN);

        pthread_create(&tid[socketDeckPair], NULL, run, &mysocket);
    }
    int i = 0;
    for(; i < threads; i++){
        pthread_join(tid[i], NULL);
    }

现在如果我尝试运行./client1 2344，我会得到奇怪的结果。每次我运行 ./client1 时，线程 id 的备用：

f77fe700
f6dfd700
f77fe700
f6dfd700
f77fe700

我做错了什么？

谢谢 丹尼尔

Answer 1

• 问题一：

  pthread_t* tid[2];
  

  必须是：

  pthread_t tid[2];
  

---

• 问题 2：
  在for 循环内的以下行中：

  pthread_create(&tid[socketDeckPair], NULL, run, &mysocket);
  

  您正在使用局部变量 mysocket，当代码到达下一个 }（即：下一行）时，该变量超出范围。
  您正在传递变量的地址，该地址在下一个 }

  中已过时