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。

这是我目前正常运作的代码：

输入; ./client1 2344或./client1 2343。（2344和2343是港口）。

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循环中重新分解代码：

    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线程ID的替代：

f77fe700
f6dfd700
f77fe700
f6dfd700
f77fe700

我做错了什么？

感谢丹尼尔

Answer 1

问题1：
```
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);
```
当您的代码到达下一个mysocket（即下一行）时，您正在使用超出范围的本地变量}。
您正在传递变量的地址，即在下一个}

在循环中创建套接字/线程

1 个答案: