1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) NGINX, Inc.
5 */
6
7 #ifndef _NXT_LIST_H_INCLUDED_
8 #define _NXT_LIST_H_INCLUDED_
9
10
11 typedef struct nxt_list_part_s nxt_list_part_t;
12
13 struct nxt_list_part_s {
14 nxt_list_part_t *next;
15 uintptr_t nelts;
16 char data[];
17 };
18
19
20 typedef struct {
21 nxt_list_part_t *last;
22 #if (NXT_64BIT)
23 uint32_t size;
24 uint32_t nalloc;
25 #else
26 uint16_t size;
27 uint16_t nalloc;
28 #endif
29 nxt_mp_t *mem_pool;
30 nxt_list_part_t part;
31 } nxt_list_t;
32
33
34 typedef struct {
35 nxt_list_part_t *part;
36 uintptr_t elt;
37 } nxt_list_next_t;
38
39
40 #define nxt_list_part(list) \
41 (&(list)->part)
42
43
44 #define nxt_list_data(part) \
45 ((void *) part->data)
46
47
48 #define nxt_list_first(list) \
49 nxt_list_data(nxt_list_part(list))
50
51
52 nxt_inline void *
nxt_list_elt(nxt_list_t * list,nxt_uint_t n)53 nxt_list_elt(nxt_list_t *list, nxt_uint_t n)
54 {
55 nxt_list_part_t *part;
56
57 if (nxt_fast_path((list) != NULL)) {
58 part = nxt_list_part(list);
59
60 while (part != NULL) {
61 if (n < (nxt_uint_t) part->nelts) {
62 return nxt_pointer_to(nxt_list_data(part), n * (list)->size);
63 }
64
65 n -= (nxt_uint_t) part->nelts;
66 part = part->next;
67 }
68 }
69
70 return NULL;
71 }
72
73
74 #define nxt_list_each(elt, list) \
75 do { \
76 if (nxt_fast_path((list) != NULL)) { \
77 void *_end; \
78 nxt_list_part_t *_part = nxt_list_part(list); \
79 \
80 do { \
81 elt = nxt_list_data(_part); \
82 \
83 for (_end = (elt + _part->nelts); elt != _end; elt++) { \
84
85 #define nxt_list_loop \
86 } \
87 \
88 _part = _part->next; \
89 \
90 } while (_part != NULL); \
91 } \
92 } while (0)
93
94
95 NXT_EXPORT nxt_list_t *nxt_list_create(nxt_mp_t *mp, nxt_uint_t n, size_t size);
96 NXT_EXPORT void *nxt_list_add(nxt_list_t *list);
97 NXT_EXPORT void *nxt_list_zero_add(nxt_list_t *list);
98
99 NXT_EXPORT void *nxt_list_next(nxt_list_t *list, nxt_list_next_t *next);
100
101
102 #define nxt_list_next_value(list, next) \
103 (nxt_pointer_to(nxt_list_data((next)->part), (next)->elt * (list)->size))
104
105
106 nxt_inline nxt_uint_t
nxt_list_nelts(nxt_list_t * list)107 nxt_list_nelts(nxt_list_t *list)
108 {
109 nxt_uint_t n;
110 nxt_list_part_t *part;
111
112 n = 0;
113
114 if (nxt_fast_path((list) != NULL)) {
115 part = nxt_list_part(list);
116
117 do {
118 n += (nxt_uint_t) part->nelts;
119 part = part->next;
120 } while (part != NULL);
121 }
122
123 return n;
124 }
125
126
127 #endif /* _NXT_LIST_H_INCLUDED_ */
128