1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
8 #define _NGX_EVENT_TIMER_H_INCLUDED_
9
10
11 #include <ngx_config.h>
12 #include <ngx_core.h>
13 #include <ngx_event.h>
14
15
16 #define NGX_TIMER_INFINITE (ngx_msec_t) -1
17
18 #define NGX_TIMER_LAZY_DELAY 300
19
20
21 ngx_int_t ngx_event_timer_init(ngx_log_t *log);
22 ngx_msec_t ngx_event_find_timer(void);
23 void ngx_event_expire_timers(void);
24
25
26 #if (NGX_THREADS)
27 extern ngx_mutex_t *ngx_event_timer_mutex;
28 #endif
29
30
31 extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
32
33
34 static ngx_inline void
35 ngx_event_del_timer(ngx_event_t *ev)
36 {
37 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
38 "event timer del: %d: %M",
39 ngx_event_ident(ev->data), ev->timer.key);
40
41 ngx_mutex_lock(ngx_event_timer_mutex);
42
43 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
44
45 ngx_mutex_unlock(ngx_event_timer_mutex);
46
47 #if (NGX_DEBUG)
48 ev->timer.left = NULL;
49 ev->timer.right = NULL;
50 ev->timer.parent = NULL;
51 #endif
52
53 ev->timer_set = 0;
54 }
55
56
57 static ngx_inline void
58 ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
59 {
60 ngx_msec_t key;
61 ngx_msec_int_t diff;
62
63 key = ngx_current_msec + timer;
64
65 if (ev->timer_set) {
66
67 /*
68 * Use a previous timer value if difference between it and a new
69 * value is less than NGX_TIMER_LAZY_DELAY milliseconds: this allows
70 * to minimize the rbtree operations for fast connections.
71 */
72
73 diff = (ngx_msec_int_t) (key - ev->timer.key);
74
75 if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
76 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
77 "event timer: %d, old: %M, new: %M",
78 ngx_event_ident(ev->data), ev->timer.key, key);
79 return;
80 }
81
82 ngx_del_timer(ev);
83 }
84
85 ev->timer.key = key;
86
87 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
88 "event timer add: %d: %M:%M",
89 ngx_event_ident(ev->data), timer, ev->timer.key);
90
91 ngx_mutex_lock(ngx_event_timer_mutex);
92
93 ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
94
95 ngx_mutex_unlock(ngx_event_timer_mutex);
96
97 ev->timer_set = 1;
98 }
99
100
101 #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
102
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