/// <summary>
/// 处理服务器套接字
/// </summary>
/// <param name="item">待处理的PollItem</param>
private void HandleServerSocket(PollItem item)
{
//如果出错或者挂起，则关闭连接
if ((item.Mode & (PollMode.PollError | PollMode.PollHangUp)) != 0)
{
poll.Unregister(server);
server.Close();
}
//否则建立一个新的socket，然后让侦听中的插口去accept它，以后数据的读写应该在新的socket中进行。
else
{
Socket newSocket = server.Accept();
newSocket.Blocking = false;
SingleSocket newSingleSocket = new SingleSocket(this, newSocket, handler);
singleSocketDictionary[newSocket.Handle] = newSingleSocket;
poll.Register(newSocket, PollMode.PollIn);
handler.MakeExternalConnection(newSingleSocket);
}
}