how to use chain in rtems?

[Chan Kim]

Through simple test I found the correct method.
ptr = (foo *)chain.Chain.Head.Node.next;
-------------------
   int i;
    rtems_chain_control chain;
    foo *ptr;
    rtems_chain_node *nptr;
    rtems_chain_initialize_empty(&chain);
    for (i=0; i< 10; i++) {
        foo *bar = malloc (sizeof (foo));
        if (!bar) return -1;
        bar->number = 10-i;
        printk("i=%d, bar = %x, bar->number = %d\n", i , bar, bar->number);
        rtems_chain_append(&chain, &bar->node);
    }

    ptr = (foo *)chain.Chain.Head.Node.next;
    printk("ptr = %x, ptr->number = %d\n", ptr, ptr->number);
    rtems_chain_extract(ptr);
    ptr = (foo *)chain.Chain.Head.Node.next;
    printk("ptr->number = %d\n", ptr->number);
    while (1) ;
---------------------result
i=0, bar = 201CEE48, bar->number = 10
i=1, bar = 201CEE60, bar->number = 9
i=2, bar = 201CEE78, bar->number = 8
i=3, bar = 201CEE90, bar->number = 7
i=4, bar = 201CEEA8, bar->number = 6
i=5, bar = 201CEEC0, bar->number = 5
i=6, bar = 201CEED8, bar->number = 4
i=7, bar = 201CEEF0, bar->number = 3
i=8, bar = 201CEF08, bar->number = 2
i=9, bar = 201CEF20, bar->number = 1
ptr = 201CEE48, ptr->number = 10
ptr->number = 9

Chan




보낸 사람 : "Chan Kim" <ckim at etri.re.kr>
보낸 날짜 : 2015-08-25 17:40:08 ( +09:00 )
받는 사람 : users at rtems.org <users at rtems.org>
참조 : 
제목 : how to use chain in rtems?


Hello, all,

To use chain, I added rtems_chain_control queue; in the host structure. 
Also, mrq has rtems_chain_node node; as the first element.

The method I used is 
to initialize : 
rtems_chain_initialize_empty(&host->queue);
to append mrq to the queue : 
rtems_chain_append(&host->queue, &mrq->node);
to get the first node : 
mrq = (struct mmc_request *)host->queue.Chain.Head.fill; (method 1) 
mrq = (struct mmc_reequest *)rtems_chain_head(&host->queue); (method 2)

rtems_chain_extract(&mrq->node); (after method1 or method 2 I did this to distroy the node from the chain)

Is this correct method? I put WR mrq and when I was about to extract that, I enqueued RD mrq, then, when I read the first element,
it is RD mrq (using method 1) or some other value (using method 2).
Please someone tell me how to use it.

Thanks in advance.
Chan
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