Mercurial > hg > nginx
annotate src/core/ngx_queue.c @ 4450:4919fb357a5d stable-1.0
Merge of r4406, r4413: copyrights updated.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sun, 05 Feb 2012 20:02:59 +0000 |
parents | 72db8932f782 |
children | 3038bd4d7816 |
rev | line source |
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2026 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4450
4919fb357a5d
Merge of r4406, r4413: copyrights updated.
Maxim Dounin <mdounin@mdounin.ru>
parents:
2026
diff
changeset
|
4 * Copyright (C) Nginx, Inc. |
2026 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
12 /* | |
13 * find the middle queue element if the queue has odd number of elements | |
14 * or the first element of the queue's second part otherwise | |
15 */ | |
16 | |
17 ngx_queue_t * | |
18 ngx_queue_middle(ngx_queue_t *queue) | |
19 { | |
20 ngx_queue_t *middle, *next; | |
21 | |
22 middle = ngx_queue_head(queue); | |
23 | |
24 if (middle == ngx_queue_last(queue)) { | |
25 return middle; | |
26 } | |
27 | |
28 next = ngx_queue_head(queue); | |
29 | |
30 for ( ;; ) { | |
31 middle = ngx_queue_next(middle); | |
32 | |
33 next = ngx_queue_next(next); | |
34 | |
35 if (next == ngx_queue_last(queue)) { | |
36 return middle; | |
37 } | |
38 | |
39 next = ngx_queue_next(next); | |
40 | |
41 if (next == ngx_queue_last(queue)) { | |
42 return middle; | |
43 } | |
44 } | |
45 } | |
46 | |
47 | |
48 /* the stable insertion sort */ | |
49 | |
50 void | |
51 ngx_queue_sort(ngx_queue_t *queue, | |
52 ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *)) | |
53 { | |
54 ngx_queue_t *q, *prev, *next; | |
55 | |
56 q = ngx_queue_head(queue); | |
57 | |
58 if (q == ngx_queue_last(queue)) { | |
59 return; | |
60 } | |
61 | |
62 for (q = ngx_queue_next(q); q != ngx_queue_sentinel(queue); q = next) { | |
63 | |
64 prev = ngx_queue_prev(q); | |
65 next = ngx_queue_next(q); | |
66 | |
67 ngx_queue_remove(q); | |
68 | |
69 do { | |
70 if (cmp(prev, q) <= 0) { | |
71 break; | |
72 } | |
73 | |
74 prev = ngx_queue_prev(prev); | |
75 | |
76 } while (prev != ngx_queue_sentinel(queue)); | |
77 | |
78 ngx_queue_insert_after(prev, q); | |
79 } | |
80 } |