Help me with the method of use list_head

See more:

C

Linux

i have met this question this days.there are 2 lines of a function.
i want to know what does the list_entry() do?
wether it gets the offset of ptr's member "score" or gets list's member "ptr"?
the list_head is a kind of data structures of the Linux system,and how to use list_head?
i'm a newbie...thx for your help...
:confused: :confused: :confused:

...
curinf = list_entry(cur,struct ptr, list[i]);
curinf->score[i] -= sub;
...

/*the definition of ptr*/
struct ptr {
    struct int *x;
    struct list_head head;
    struct list_head list[4];
    int len;
    short weight;
    unsigned double score[4];
};