1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_event.h>
11
12
13 ngx_rbtree_t ngx_event_timer_rbtree;
14 static ngx_rbtree_node_t ngx_event_timer_sentinel;
15
16 /*
17 * the event timer rbtree may contain the duplicate keys, however,
18 * it should not be a problem, because we use the rbtree to find
19 * a minimum timer value only
20 */
21
22 ngx_int_t
ngx_event_timer_init(ngx_log_t * log)23 ngx_event_timer_init(ngx_log_t *log)
24 {
25 ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
26 ngx_rbtree_insert_timer_value);
27
28 return NGX_OK;
29 }
30
31
32 ngx_msec_t
ngx_event_find_timer(void)33 ngx_event_find_timer(void)
34 {
35 ngx_msec_int_t timer;
36 ngx_rbtree_node_t *node, *root, *sentinel;
37
38 if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
39 return NGX_TIMER_INFINITE;
40 }
41
42 root = ngx_event_timer_rbtree.root;
43 sentinel = ngx_event_timer_rbtree.sentinel;
44
45 node = ngx_rbtree_min(root, sentinel);
46
47 timer = (ngx_msec_int_t) (node->key - ngx_current_msec);
48
49 return (ngx_msec_t) (timer > 0 ? timer : 0);
50 }
51
52
53 void
ngx_event_expire_timers(void)54 ngx_event_expire_timers(void)
55 {
56 ngx_event_t *ev;
57 ngx_rbtree_node_t *node, *root, *sentinel;
58
59 sentinel = ngx_event_timer_rbtree.sentinel;
60
61 for ( ;; ) {
62 root = ngx_event_timer_rbtree.root;
63
64 if (root == sentinel) {
65 return;
66 }
67
68 node = ngx_rbtree_min(root, sentinel);
69
70 /* node->key > ngx_current_msec */
71
72 if ((ngx_msec_int_t) (node->key - ngx_current_msec) > 0) {
73 return;
74 }
75
76 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
77
78 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
79 "event timer del: %d: %M",
80 ngx_event_ident(ev->data), ev->timer.key);
81
82 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
83
84 #if (NGX_DEBUG)
85 ev->timer.left = NULL;
86 ev->timer.right = NULL;
87 ev->timer.parent = NULL;
88 #endif
89
90 ev->timer_set = 0;
91
92 ev->timedout = 1;
93
94 ev->handler(ev);
95 }
96 }
97
98
99 ngx_int_t
ngx_event_no_timers_left(void)100 ngx_event_no_timers_left(void)
101 {
102 ngx_event_t *ev;
103 ngx_rbtree_node_t *node, *root, *sentinel;
104
105 sentinel = ngx_event_timer_rbtree.sentinel;
106 root = ngx_event_timer_rbtree.root;
107
108 if (root == sentinel) {
109 return NGX_OK;
110 }
111
112 for (node = ngx_rbtree_min(root, sentinel);
113 node;
114 node = ngx_rbtree_next(&ngx_event_timer_rbtree, node))
115 {
116 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
117
118 if (!ev->cancelable) {
119 return NGX_AGAIN;
120 }
121 }
122
123 /* only cancelable timers left */
124
125 return NGX_OK;
126 }
127