ppc.h: use mftb on ppc
[urcu.git] / include / urcu / hlist.h
1 // SPDX-FileCopyrightText: 2009 Novell Inc.
2 // SPDX-FileCopyrightText: 2010-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 //
4 // SPDX-License-Identifier: LGPL-2.1-only
5
6 #ifndef _KCOMPAT_HLIST_H
7 #define _KCOMPAT_HLIST_H
8
9 /*
10 * Kernel sourcecode compatible lightweight single pointer list head useful
11 * for implementing hash tables
12 *
13 * Author: Jan Blunck <jblunck@suse.de>
14 */
15
16 #include <stddef.h>
17 #include <urcu/compiler.h>
18
19 struct cds_hlist_head {
20 struct cds_hlist_node *next;
21 };
22
23 struct cds_hlist_node {
24 struct cds_hlist_node *next, *prev;
25 };
26
27 /* Initialize a new list head. */
28 static inline
29 void CDS_INIT_HLIST_HEAD(struct cds_hlist_head *ptr)
30 {
31 ptr->next = NULL;
32 }
33
34 #define CDS_HLIST_HEAD(name) \
35 struct cds_hlist_head name = { NULL }
36
37 #define CDS_HLIST_HEAD_INIT(name) \
38 { .next = NULL }
39
40 /* Get typed element from list at a given position. */
41 #define cds_hlist_entry(ptr, type, member) caa_container_of(ptr, type, member)
42
43 /* Get typed element from list at a given position, keeping NULL pointers. */
44 #define cds_hlist_entry_safe(ptr, type, member) \
45 ({ \
46 __typeof__(ptr) ____ret = (ptr); \
47 ____ret ? cds_hlist_entry(____ret, type, member) : NULL; \
48 })
49
50 /* Add new element at the head of the list. */
51 static inline
52 void cds_hlist_add_head(struct cds_hlist_node *newp,
53 struct cds_hlist_head *head)
54 {
55 if (head->next)
56 head->next->prev = newp;
57 newp->next = head->next;
58 newp->prev = (struct cds_hlist_node *) head;
59 head->next = newp;
60 }
61
62 /* Remove element from list. */
63 static inline
64 void cds_hlist_del(struct cds_hlist_node *elem)
65 {
66 if (elem->next)
67 elem->next->prev = elem->prev;
68 elem->prev->next = elem->next;
69 }
70
71 #define cds_hlist_for_each(pos, head) \
72 for (pos = (head)->next; (pos) != NULL; pos = (pos)->next)
73
74 #define cds_hlist_for_each_safe(pos, p, head) \
75 for (pos = (head)->next; \
76 ((pos) != NULL) && (p = (pos)->next, 1); \
77 pos = (p))
78
79 /*
80 * cds_hlist_for_each_entry and cds_hlist_for_each_entry_safe take
81 * respectively 4 and 5 arguments, while the Linux kernel APIs take 3,
82 * and 4. We implement cds_hlist_for_each_entry_2() and
83 * cds_hlist_for_each_entry_safe_2() to follow the Linux kernel APIs.
84 */
85 #define cds_hlist_for_each_entry(entry, pos, head, member) \
86 for (pos = (head)->next, \
87 entry = cds_hlist_entry(pos, __typeof__(*(entry)), member); \
88 (pos) != NULL; \
89 pos = (pos)->next, \
90 entry = cds_hlist_entry(pos, __typeof__(*(entry)), member))
91
92 #define cds_hlist_for_each_entry_safe(entry, pos, p, head, member) \
93 for (pos = (head)->next, \
94 entry = cds_hlist_entry(pos, __typeof__(*(entry)), member); \
95 ((pos) != NULL) && (p = (pos)->next, 1); \
96 pos = (p), \
97 entry = cds_hlist_entry(pos, __typeof__(*entry), member))
98
99 #define cds_hlist_for_each_entry_2(entry, head, member) \
100 for (entry = cds_hlist_entry_safe((head)->next, __typeof__(*(entry)), member); \
101 (entry) != NULL; \
102 entry = cds_hlist_entry_safe((entry)->member.next, __typeof__(*(entry)), member))
103
104 #define cds_hlist_for_each_entry_safe_2(entry, e, head, member) \
105 for (entry = cds_hlist_entry_safe((head)->next, __typeof__(*(entry)), member); \
106 ((entry) != NULL) && (e = (cds_hlist_entry_safe((entry)->member.next, \
107 __typeof__(*(entry)), member)), 1); \
108 entry = e)
109
110 #endif /* _KCOMPAT_HLIST_H */
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