0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_event.h>
|
|
10
|
|
11
|
|
12 #if (NGX_THREADS)
|
|
13 ngx_mutex_t *ngx_event_timer_mutex;
|
|
14 #endif
|
|
15
|
|
16
|
108
|
17 ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
|
|
18 static ngx_rbtree_node_t ngx_event_timer_sentinel;
|
0
|
19
|
274
|
20 /*
|
|
21 * the event timer rbtree may contain the duplicate keys, however,
|
|
22 * it should not be a problem, because we use the rbtree to find
|
|
23 * a minimum timer value only
|
|
24 */
|
0
|
25
|
42
|
26 ngx_int_t
|
|
27 ngx_event_timer_init(ngx_log_t *log)
|
0
|
28 {
|
356
|
29 ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
|
|
30 ngx_rbtree_insert_timer_value);
|
108
|
31
|
0
|
32 #if (NGX_THREADS)
|
108
|
33
|
|
34 if (ngx_event_timer_mutex) {
|
0
|
35 ngx_event_timer_mutex->log = log;
|
|
36 return NGX_OK;
|
|
37 }
|
|
38
|
50
|
39 ngx_event_timer_mutex = ngx_mutex_init(log, 0);
|
|
40 if (ngx_event_timer_mutex == NULL) {
|
0
|
41 return NGX_ERROR;
|
|
42 }
|
108
|
43
|
0
|
44 #endif
|
|
45
|
|
46 return NGX_OK;
|
|
47 }
|
|
48
|
|
49
|
42
|
50 ngx_msec_t
|
|
51 ngx_event_find_timer(void)
|
0
|
52 {
|
110
|
53 ngx_msec_int_t timer;
|
|
54 ngx_rbtree_node_t *node, *root, *sentinel;
|
0
|
55
|
108
|
56 if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
|
0
|
57 return NGX_TIMER_INFINITE;
|
|
58 }
|
|
59
|
112
|
60 ngx_mutex_lock(ngx_event_timer_mutex);
|
0
|
61
|
108
|
62 root = ngx_event_timer_rbtree.root;
|
|
63 sentinel = ngx_event_timer_rbtree.sentinel;
|
|
64
|
|
65 node = ngx_rbtree_min(root, sentinel);
|
0
|
66
|
|
67 ngx_mutex_unlock(ngx_event_timer_mutex);
|
|
68
|
112
|
69 timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec;
|
0
|
70
|
108
|
71 return (ngx_msec_t) (timer > 0 ? timer : 0);
|
0
|
72 }
|
|
73
|
|
74
|
42
|
75 void
|
106
|
76 ngx_event_expire_timers(void)
|
0
|
77 {
|
108
|
78 ngx_event_t *ev;
|
|
79 ngx_rbtree_node_t *node, *root, *sentinel;
|
|
80
|
|
81 sentinel = ngx_event_timer_rbtree.sentinel;
|
0
|
82
|
|
83 for ( ;; ) {
|
|
84
|
112
|
85 ngx_mutex_lock(ngx_event_timer_mutex);
|
0
|
86
|
108
|
87 root = ngx_event_timer_rbtree.root;
|
|
88
|
|
89 if (root == sentinel) {
|
|
90 return;
|
|
91 }
|
|
92
|
|
93 node = ngx_rbtree_min(root, sentinel);
|
0
|
94
|
106
|
95 /* node->key <= ngx_current_time */
|
|
96
|
112
|
97 if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
|
0
|
98 {
|
108
|
99 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
|
0
|
100
|
|
101 #if (NGX_THREADS)
|
|
102
|
|
103 if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
|
|
104
|
|
105 /*
|
|
106 * We can not change the timer of the event that is been
|
|
107 * handling by another thread. And we can not easy walk
|
|
108 * the rbtree to find a next expired timer so we exit the loop.
|
|
109 * However it should be rare case when the event that is
|
|
110 * been handling has expired timer.
|
|
111 */
|
|
112
|
|
113 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
10
|
114 "event %p is busy in expire timers", ev);
|
0
|
115 break;
|
|
116 }
|
|
117 #endif
|
|
118
|
|
119 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
106
|
120 "event timer del: %d: %M",
|
108
|
121 ngx_event_ident(ev->data), ev->timer.key);
|
0
|
122
|
108
|
123 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
|
0
|
124
|
|
125 ngx_mutex_unlock(ngx_event_timer_mutex);
|
|
126
|
|
127 #if (NGX_DEBUG)
|
108
|
128 ev->timer.left = NULL;
|
|
129 ev->timer.right = NULL;
|
|
130 ev->timer.parent = NULL;
|
0
|
131 #endif
|
|
132
|
|
133 ev->timer_set = 0;
|
|
134
|
|
135 #if (NGX_THREADS)
|
|
136 if (ngx_threaded) {
|
112
|
137 ev->posted_timedout = 1;
|
0
|
138
|
112
|
139 ngx_post_event(ev, &ngx_posted_events);
|
0
|
140
|
|
141 ngx_unlock(ev->lock);
|
|
142
|
|
143 continue;
|
|
144 }
|
|
145 #endif
|
|
146
|
|
147 ev->timedout = 1;
|
|
148
|
58
|
149 ev->handler(ev);
|
0
|
150
|
|
151 continue;
|
|
152 }
|
|
153
|
|
154 break;
|
|
155 }
|
|
156
|
|
157 ngx_mutex_unlock(ngx_event_timer_mutex);
|
|
158 }
|