使用 setsockopt 设置 TCP_NODELAY

const char chOpt=1;
int nErr=setsockopt( m_socket, IPPROTO_TCP, TCP_NODELAY, &chOpt, sizeof(char));
if(nErr==-1)
{
    TRACE(_T("setsockopt() error\n"),WSAGetLastError());
    return ;
}

case TCP_NODELAY:
if (val) {
    tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH;
    tcp_push_pending_frames(sk);
} else {
    tp->nonagle &= ~TCP_NAGLE_OFF;
}
break;