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1646
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4412
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4 * Copyright (C) Nginx, Inc.
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1646
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10
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11
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12 #ifndef _NGX_QUEUE_H_INCLUDED_
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13 #define _NGX_QUEUE_H_INCLUDED_
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14
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15
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16 typedef struct ngx_queue_s ngx_queue_t;
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17
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18 struct ngx_queue_s {
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19 ngx_queue_t *prev;
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20 ngx_queue_t *next;
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21 };
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22
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23
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24 #define ngx_queue_init(q) \
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25 (q)->prev = q; \
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26 (q)->next = q
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27
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28
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29 #define ngx_queue_empty(h) \
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30 (h == (h)->prev)
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31
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32
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33 #define ngx_queue_insert_head(h, x) \
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34 (x)->next = (h)->next; \
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35 (x)->next->prev = x; \
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36 (x)->prev = h; \
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37 (h)->next = x
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38
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39
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2026
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40 #define ngx_queue_insert_after ngx_queue_insert_head
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41
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42
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43 #define ngx_queue_insert_tail(h, x) \
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44 (x)->prev = (h)->prev; \
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45 (x)->prev->next = x; \
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46 (x)->next = h; \
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47 (h)->prev = x
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48
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49
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50 #define ngx_queue_head(h) \
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51 (h)->next
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52
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53
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54 #define ngx_queue_last(h) \
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55 (h)->prev
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56
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57
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58 #define ngx_queue_sentinel(h) \
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59 (h)
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60
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61
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62 #define ngx_queue_next(q) \
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63 (q)->next
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64
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65
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66 #define ngx_queue_prev(q) \
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67 (q)->prev
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68
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69
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70 #if (NGX_DEBUG)
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71
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72 #define ngx_queue_remove(x) \
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73 (x)->next->prev = (x)->prev; \
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74 (x)->prev->next = (x)->next; \
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75 (x)->prev = NULL; \
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76 (x)->next = NULL
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77
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78 #else
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79
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80 #define ngx_queue_remove(x) \
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81 (x)->next->prev = (x)->prev; \
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82 (x)->prev->next = (x)->next
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83
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84 #endif
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85
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86
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87 #define ngx_queue_split(h, q, n) \
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88 (n)->prev = (h)->prev; \
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89 (n)->prev->next = n; \
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90 (n)->next = q; \
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91 (h)->prev = (q)->prev; \
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92 (h)->prev->next = h; \
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93 (q)->prev = n;
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94
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95
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96 #define ngx_queue_add(h, n) \
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97 (h)->prev->next = (n)->next; \
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98 (n)->next->prev = (h)->prev; \
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99 (h)->prev = (n)->prev; \
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100 (h)->prev->next = h;
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101
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102
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103 #define ngx_queue_data(q, type, link) \
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104 (type *) ((u_char *) q - offsetof(type, link))
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105
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106
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107 ngx_queue_t *ngx_queue_middle(ngx_queue_t *queue);
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108 void ngx_queue_sort(ngx_queue_t *queue,
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109 ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *));
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110
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111
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112 #endif /* _NGX_QUEUE_H_INCLUDED_ */
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