Hi Forum,
             I am new to QNX and basically porting from io-net to io-pkt.

I will be using nw_pthread_create() , I was looking at some implementations as suggested by the website for porting and 
I see that there is a init function as 6th argument, where  wtp is intialized and on it "wtp->quiesce_callout" is called
 for a user specific function which basically will call "MsgSendPulse()".

Is it a must to have a init_function. What if I put all NULLs to the extra last 3  arugments in nw_pthread_create()? 
Will it work?

And I have a question regarding the iov_t. 

The existing implementation for io-net was done using iov now I am trying to port to io-pkt. Do I need to use iov or  
just copy the address of my data location to mbuf to send it across to other machine using "if_output()" funtion 
available on ifnet struct. 

I am thinking if_output() function will take care of sending it in its own format and on the other end when mbuf is 
received I will have
 a "PFIL_IN" hook which gets the mbuf content.

The below is the structs of iov on io-net.h file

typedef struct _net_iovec net_iov_t;

struct _net_iovec {
	void    *iov_base;
	paddr_t  iov_phys;
	size_t   iov_len;
};


typedef struct _net_buf net_buf_t;

struct _net_buf {
	TAILQ_ENTRY(_net_buf) ptrs;
	int niov;
	net_iov_t *net_iov;
};


I also see that in io-net implementation at some point we need to insert net_buf in "_npkt" struct as described below. I
 have just copied some code line below from my io-net implementation.

    /* Insert net_buf in npkt */
    TAILQ_INSERT_HEAD(&npkt->buffers, nb, ptrs);
/* Setup iov, it lives right after the net_buf */
    iov = (net_iov_t *)(nb + 1);
    nb->niov = 1;
    nb->net_iov = iov;
    iov->iov_base = (char *)ptr; /* Iov points to data buffer */
    /* Align it */
    if (((int) iov->iov_base) % 4) {
        (char *)iov->iov_base += 3;
        
        iov->iov_base = (char *)((int)iov->iov_base & ~3);
    }
    iov->iov_len = HM_TOTAL_PACKET_SZ;
    iov->iov_phys = (paddr_t)(pfilter_ctrl->npi->mphys(iov->iov_base));
    npkt->org_data = ptr;
    npkt->next = NULL;
    npkt->tot_iov = 1;
    return npkt;



For "io-pkt" implementation I have the iov_t on the nw_stk_ctl struct  in nw_datastruct.h . 

Is it a must to use iov to send and receive data.

Thanks
Vinod