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[Kernel] Add list_for_each_entry and list_frist_entry routine. 

committed by FH.
This commit is contained in:
Bernard Xiong 2016-05-20 12:24:08 +08:00
parent 36edc2c441
commit bb1cb89b52
1 changed files with 21 additions and 0 deletions
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21
include/rtservice.h
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@ -113,6 +113,27 @@ rt_inline int rt_list_isempty(const rt_list_t *l)
#define rt_list_entry(node, type, member) \
((type *)((char *)(node) - (unsigned long)(&((type *)0)->member)))
/**
* list_for_each_entry - iterate over list of given type
* @pos: the type * to use as a loop cursor.
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry(pos, head, member) \
for (pos = rt_list_entry((head)->next, typeof(*pos), member); \
&pos->member != (head); \
pos = rt_list_entry(pos->member.next, typeof(*pos), member))
/**
* list_first_entry - get the first element from a list
* @ptr: the list head to take the element from.
* @type: the type of the struct this is embedded in.
* @member: the name of the list_struct within the struct.
*
* Note, that list is expected to be not empty.
*/
#define list_first_entry(ptr, type, member) \
rt_list_entry((ptr)->next, type, member)
/*@}*/
#ifdef __cplusplus