struct _Worker{    _Worker()    {        pWokerbase=NULL;        hThread=INVALID_HANDLE_VALUE;        pListConn=NULL;    }    struct event_base *pWokerbase;    HANDLE hThread;    _ConnList *pListConn;    inline _Conn* GetFreeConn()    {        _Conn*pItem=NULL;        if(pListConn->head!=pListConn->tail)        {            pItem=pListConn->head;            pListConn->head=pListConn->head->next;        }        return pItem;    }    inline void PutFreeConn(_Conn *pItem)    {        pListConn->tail->next=pItem;        pListConn->tail=pItem;    }};