connect非阻塞，send和recv是阻塞的，会影响发送和接收吗？

SOCKET/*int*/ sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if(sockfd < 0) 

    {

        return;

    }

    struct sockaddr_in serv_addr;



    //以服务器地址填充结构serv_addr

    serv_addr.sin_family = AF_INET;

    serv_addr.sin_addr.s_addr = inet_addr(strIP);

    serv_addr.sin_port = htons(nPort);

   int iTimeOut = 3000;

    setsockopt(hSocket,SOL_SOCKET,SO_RCVTIMEO,(char*)&iTimeOut,sizeof(iTimeOut));

    setsockopt(hSocket,SOL_SOCKET,SO_SNDTIMEO,(char*)&iTimeOut,sizeof(iTimeOut));    



    int error = -1;

    int len = sizeof(int);

    timeval tm;

    fd_set set;

    unsigned long ul = 1;

    ioctlsocket(sockfd, FIONBIO, &ul); //设置为非阻塞模式

    bool ret = false;

    if( connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)

    {

        tm.tv_sec  = 3;

        tm.tv_usec = 0;

        FD_ZERO(&set);

        FD_SET(sockfd, &set);

        if( select(sockfd+1, NULL, &set, NULL, &tm) > 0)

        {

            getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (char *)&error, /*(socklen_t *)*/&len);

            if(error == 0) 

                ret = true;

            else 

                ret = false;

        } 

        else 

            ret = false;

    }

    else 

        ret = true;

    ul = 0;

    ioctlsocket(sockfd, FIONBIO, &ul); //设置为阻塞模式

    if(!ret) 

    {

        closesocket( sockfd );

        fprintf(stderr , "Cannot Connect the server!/n");

        return;

    }



    fprintf( stderr , "Connected!/n");



    char buff[] = "hello";

    int sl=::send(sockfd,(char*)buff, sizeof(buff), 0);

    char buffer[512] = {0};

    int ret = recv(sockfd, buffer, sizeof(buffer), 0);

    closesocket( sockfd );