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[onus]

Hi,in Linux Kernel
following section of code
there is a structure which is defined as

struct list_head {

        struct list_head *next, *prev;

};

It is used in another file as

#define LIST_HEAD_INIT(name) { &(name), &(name) }


#define LIST_HEAD(name) \

        struct list_head name = LIST_HEAD_INIT(name)


static inline void INIT_LIST_HEAD(struct list_head *list)

{

        list->next = list;

        list->prev = list;

}

I came across a book where the code is given as follows in an example

include/linux/list.h

struct list_head {

struct list_head *next,*prev;

};

#define LIST_HEAD_INIT(name) {&(name),&(name)}


#define LIST_HEAD(name) struct list_head name = LIST_HEAD_INIT(name)

#define INIT_LIST_HEAD(ptr) do {\

(ptr)->next = (ptr);(ptr)->prev= (ptr);\

}while(0)

I was not able to understand above code segment.
I am aware of what a #define is but still I could not understand above thing.
Can some one help in understanding with some example.
Not related to Linux Kernel a normal example where I can make a link list with above defined way.