rt-thread/include/rtservice.h

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/*
2021-03-08 17:22:21 +08:00
* Copyright (c) 2006-2021, RT-Thread Development Team
2013-06-24 17:06:09 +08:00
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2006-03-16 Bernard the first version
* 2006-09-07 Bernard move the kservice APIs to rtthread.h
* 2007-06-27 Bernard fix the rt_list_remove bug
* 2012-03-22 Bernard rename kservice.h to rtservice.h
* 2017-11-15 JasonJia Modify rt_slist_foreach to rt_slist_for_each_entry.
* Make code cleanup.
*/
#ifndef __RT_SERVICE_H__
#define __RT_SERVICE_H__
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup KernelService
*/
/**@{*/
/**
* rt_container_of - return the member address of ptr, if the type of ptr is the
* struct type.
*/
#define rt_container_of(ptr, type, member) \
((type *)((char *)(ptr) - (unsigned long)(&((type *)0)->member)))
/**
* @brief initialize a list object
*/
#define RT_LIST_OBJECT_INIT(object) { &(object), &(object) }
/**
* @brief initialize a list
*
* @param l list to be initialized
*/
rt_inline void rt_list_init(rt_list_t *l)
{
l->next = l->prev = l;
}
/**
* @brief insert a node after a list
*
* @param l list to insert it
* @param n new node to be inserted
*/
rt_inline void rt_list_insert_after(rt_list_t *l, rt_list_t *n)
{
l->next->prev = n;
n->next = l->next;
l->next = n;
n->prev = l;
}
/**
* @brief insert a node before a list
*
* @param n new node to be inserted
* @param l list to insert it
*/
rt_inline void rt_list_insert_before(rt_list_t *l, rt_list_t *n)
{
l->prev->next = n;
n->prev = l->prev;
l->prev = n;
n->next = l;
}
/**
* @brief remove node from list.
* @param n the node to remove from the list.
*/
rt_inline void rt_list_remove(rt_list_t *n)
{
n->next->prev = n->prev;
n->prev->next = n->next;
n->next = n->prev = n;
}
/**
* @brief tests whether a list is empty
* @param l the list to test.
*/
rt_inline int rt_list_isempty(const rt_list_t *l)
{
return l->next == l;
}
/**
* @brief get the list length
* @param l the list to get.
*/
rt_inline unsigned int rt_list_len(const rt_list_t *l)
{
unsigned int len = 0;
const rt_list_t *p = l;
while (p->next != l)
{
p = p->next;
len ++;
}
return len;
}
/**
* @brief get the struct for this entry
* @param node the entry point
* @param type the type of structure
* @param member the name of list in structure
*/
#define rt_list_entry(node, type, member) \
rt_container_of(node, type, member)
/**
* rt_list_for_each - iterate over a list
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* @pos: the rt_list_t * to use as a loop cursor.
* @head: the head for your list.
*/
#define rt_list_for_each(pos, head) \
for (pos = (head)->next; pos != (head); pos = pos->next)
/**
* rt_list_for_each_safe - iterate over a list safe against removal of list entry
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* @pos: the rt_list_t * to use as a loop cursor.
* @n: another rt_list_t * to use as temporary storage
* @head: the head for your list.
*/
#define rt_list_for_each_safe(pos, n, head) \
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for (pos = (head)->next, n = pos->next; pos != (head); \
pos = n, n = pos->next)
/**
* rt_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 rt_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))
/**
* rt_list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
* @pos: the type * to use as a loop cursor.
* @n: another type * to use as temporary storage
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define rt_list_for_each_entry_safe(pos, n, head, member) \
for (pos = rt_list_entry((head)->next, typeof(*pos), member), \
n = rt_list_entry(pos->member.next, typeof(*pos), member); \
&pos->member != (head); \
pos = n, n = rt_list_entry(n->member.next, typeof(*n), member))
/**
* rt_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 rt_list_first_entry(ptr, type, member) \
rt_list_entry((ptr)->next, type, member)
#define RT_SLIST_OBJECT_INIT(object) { RT_NULL }
/**
* @brief initialize a single list
*
* @param l the single list to be initialized
*/
rt_inline void rt_slist_init(rt_slist_t *l)
{
l->next = RT_NULL;
}
rt_inline void rt_slist_append(rt_slist_t *l, rt_slist_t *n)
{
struct rt_slist_node *node;
node = l;
while (node->next) node = node->next;
/* append the node to the tail */
node->next = n;
n->next = RT_NULL;
}
rt_inline void rt_slist_insert(rt_slist_t *l, rt_slist_t *n)
{
n->next = l->next;
l->next = n;
}
rt_inline unsigned int rt_slist_len(const rt_slist_t *l)
{
unsigned int len = 0;
const rt_slist_t *list = l->next;
while (list != RT_NULL)
{
list = list->next;
len ++;
}
return len;
}
rt_inline rt_slist_t *rt_slist_remove(rt_slist_t *l, rt_slist_t *n)
{
/* remove slist head */
struct rt_slist_node *node = l;
while (node->next && node->next != n) node = node->next;
/* remove node */
if (node->next != (rt_slist_t *)0) node->next = node->next->next;
return l;
}
rt_inline rt_slist_t *rt_slist_first(rt_slist_t *l)
{
return l->next;
}
rt_inline rt_slist_t *rt_slist_tail(rt_slist_t *l)
{
while (l->next) l = l->next;
return l;
}
rt_inline rt_slist_t *rt_slist_next(rt_slist_t *n)
{
return n->next;
}
rt_inline int rt_slist_isempty(rt_slist_t *l)
{
return l->next == RT_NULL;
}
/**
* @brief get the struct for this single list node
* @param node the entry point
* @param type the type of structure
* @param member the name of list in structure
*/
#define rt_slist_entry(node, type, member) \
rt_container_of(node, type, member)
/**
* rt_slist_for_each - iterate over a single list
* @pos: the rt_slist_t * to use as a loop cursor.
* @head: the head for your single list.
*/
#define rt_slist_for_each(pos, head) \
for (pos = (head)->next; pos != RT_NULL; pos = pos->next)
/**
* rt_slist_for_each_entry - iterate over single list of given type
* @pos: the type * to use as a loop cursor.
* @head: the head for your single list.
* @member: the name of the list_struct within the struct.
*/
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#define rt_slist_for_each_entry(pos, head, member) \
for (pos = rt_slist_entry((head)->next, typeof(*pos), member); \
&pos->member != (RT_NULL); \
pos = rt_slist_entry(pos->member.next, typeof(*pos), member))
/**
* rt_slist_first_entry - get the first element from a slist
* @ptr: the slist head to take the element from.
* @type: the type of the struct this is embedded in.
* @member: the name of the slist_struct within the struct.
*
* Note, that slist is expected to be not empty.
*/
#define rt_slist_first_entry(ptr, type, member) \
rt_slist_entry((ptr)->next, type, member)
/**
* rt_slist_tail_entry - get the tail element from a slist
* @ptr: the slist head to take the element from.
* @type: the type of the struct this is embedded in.
* @member: the name of the slist_struct within the struct.
*
* Note, that slist is expected to be not empty.
*/
#define rt_slist_tail_entry(ptr, type, member) \
rt_slist_entry(rt_slist_tail(ptr), type, member)
/**@}*/
#ifdef __cplusplus
}
#endif
#endif