1#ifndef INTERNAL_IO_SLIST_H
2#define INTERNAL_IO_SLIST_H
3
4#include <linux/io_uring_types.h>
5
6#define __wq_list_for_each(pos, head) \
7 for (pos = (head)->first; pos; pos = (pos)->next)
8
9#define wq_list_for_each(pos, prv, head) \
10 for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
11
12#define wq_list_for_each_resume(pos, prv) \
13 for (; pos; prv = pos, pos = (pos)->next)
14
15#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
16
17#define INIT_WQ_LIST(list) do { \
18 (list)->first = NULL; \
19} while (0)
20
21static inline void wq_list_add_after(struct io_wq_work_node *node,
22 struct io_wq_work_node *pos,
23 struct io_wq_work_list *list)
24{
25 struct io_wq_work_node *next = pos->next;
26
27 pos->next = node;
28 node->next = next;
29 if (!next)
30 list->last = node;
31}
32
33static inline void wq_list_add_tail(struct io_wq_work_node *node,
34 struct io_wq_work_list *list)
35{
36 node->next = NULL;
37 if (!list->first) {
38 list->last = node;
39 WRITE_ONCE(list->first, node);
40 } else {
41 list->last->next = node;
42 list->last = node;
43 }
44}
45
46static inline void wq_list_add_head(struct io_wq_work_node *node,
47 struct io_wq_work_list *list)
48{
49 node->next = list->first;
50 if (!node->next)
51 list->last = node;
52 WRITE_ONCE(list->first, node);
53}
54
55static inline void wq_list_cut(struct io_wq_work_list *list,
56 struct io_wq_work_node *last,
57 struct io_wq_work_node *prev)
58{
59 /* first in the list, if prev==NULL */
60 if (!prev)
61 WRITE_ONCE(list->first, last->next);
62 else
63 prev->next = last->next;
64
65 if (last == list->last)
66 list->last = prev;
67 last->next = NULL;
68}
69
70static inline void __wq_list_splice(struct io_wq_work_list *list,
71 struct io_wq_work_node *to)
72{
73 list->last->next = to->next;
74 to->next = list->first;
75 INIT_WQ_LIST(list);
76}
77
78static inline bool wq_list_splice(struct io_wq_work_list *list,
79 struct io_wq_work_node *to)
80{
81 if (!wq_list_empty(list)) {
82 __wq_list_splice(list, to);
83 return true;
84 }
85 return false;
86}
87
88static inline void wq_stack_add_head(struct io_wq_work_node *node,
89 struct io_wq_work_node *stack)
90{
91 node->next = stack->next;
92 stack->next = node;
93}
94
95static inline void wq_list_del(struct io_wq_work_list *list,
96 struct io_wq_work_node *node,
97 struct io_wq_work_node *prev)
98{
99 wq_list_cut(list, last: node, prev);
100}
101
102static inline
103struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
104{
105 struct io_wq_work_node *node = stack->next;
106
107 stack->next = node->next;
108 return node;
109}
110
111static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
112{
113 if (!work->list.next)
114 return NULL;
115
116 return container_of(work->list.next, struct io_wq_work, list);
117}
118
119#endif // INTERNAL_IO_SLIST_H
120

source code of linux/io_uring/slist.h