- /*
- * Copyright (C) Igor Sysoev
- * Copyright (C) Nginx, Inc.
- */
- #include <ngx_config.h>
- #include <ngx_core.h>
- #ifndef _NGX_QUEUE_H_INCLUDED_
- #define _NGX_QUEUE_H_INCLUDED_
- typedef struct ngx_queue_s ngx_queue_t;
- struct ngx_queue_s {
- ngx_queue_t *prev;
- ngx_queue_t *next;
- };
- #define ngx_queue_init(q) \
- (q)->prev = q; \
- (q)->next = q
- #define ngx_queue_empty(h) \
- (h == (h)->prev)
- #define ngx_queue_insert_head(h, x) \
- (x)->next = (h)->next; \
- (x)->next->prev = x; \
- (x)->prev = h; \
- (h)->next = x
- #define ngx_queue_insert_after ngx_queue_insert_head
- #define ngx_queue_insert_tail(h, x) \
- (x)->prev = (h)->prev; \
- (x)->prev->next = x; \
- (x)->next = h; \
- (h)->prev = x
- #define ngx_queue_head(h) \
- (h)->next
- #define ngx_queue_last(h) \
- (h)->prev
- #define ngx_queue_sentinel(h) \
- (h)
- #define ngx_queue_next(q) \
- (q)->next
- #define ngx_queue_prev(q) \
- (q)->prev
- #if (NGX_DEBUG)
- #define ngx_queue_remove(x) \
- (x)->next->prev = (x)->prev; \
- (x)->prev->next = (x)->next; \
- (x)->prev = NULL; \
- (x)->next = NULL
- #else
- #define ngx_queue_remove(x) \
- (x)->next->prev = (x)->prev; \
- (x)->prev->next = (x)->next
- #endif
- #define ngx_queue_split(h, q, n) \
- (n)->prev = (h)->prev; \
- (n)->prev->next = n; \
- (n)->next = q; \
- (h)->prev = (q)->prev; \
- (h)->prev->next = h; \
- (q)->prev = n;
- #define ngx_queue_add(h, n) \
- (h)->prev->next = (n)->next; \
- (n)->next->prev = (h)->prev; \
- (h)->prev = (n)->prev; \
- (h)->prev->next = h;
- #define ngx_queue_data(q, type, link) \
- (type *) ((u_char *) q - offsetof(type, link))
- ngx_queue_t *ngx_queue_middle(ngx_queue_t *queue);
- void ngx_queue_sort(ngx_queue_t *queue,
- ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *));
- #endif /* _NGX_QUEUE_H_INCLUDED_ */