Annotation of embedaddon/nginx/src/event/ngx_event_timer.h, revision 1.1.1.1
1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
9: #define _NGX_EVENT_TIMER_H_INCLUDED_
10:
11:
12: #include <ngx_config.h>
13: #include <ngx_core.h>
14: #include <ngx_event.h>
15:
16:
17: #define NGX_TIMER_INFINITE (ngx_msec_t) -1
18:
19: #define NGX_TIMER_LAZY_DELAY 300
20:
21:
22: ngx_int_t ngx_event_timer_init(ngx_log_t *log);
23: ngx_msec_t ngx_event_find_timer(void);
24: void ngx_event_expire_timers(void);
25:
26:
27: #if (NGX_THREADS)
28: extern ngx_mutex_t *ngx_event_timer_mutex;
29: #endif
30:
31:
32: extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
33:
34:
35: static ngx_inline void
36: ngx_event_del_timer(ngx_event_t *ev)
37: {
38: ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
39: "event timer del: %d: %M",
40: ngx_event_ident(ev->data), ev->timer.key);
41:
42: ngx_mutex_lock(ngx_event_timer_mutex);
43:
44: ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
45:
46: ngx_mutex_unlock(ngx_event_timer_mutex);
47:
48: #if (NGX_DEBUG)
49: ev->timer.left = NULL;
50: ev->timer.right = NULL;
51: ev->timer.parent = NULL;
52: #endif
53:
54: ev->timer_set = 0;
55: }
56:
57:
58: static ngx_inline void
59: ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
60: {
61: ngx_msec_t key;
62: ngx_msec_int_t diff;
63:
64: key = ngx_current_msec + timer;
65:
66: if (ev->timer_set) {
67:
68: /*
69: * Use a previous timer value if difference between it and a new
70: * value is less than NGX_TIMER_LAZY_DELAY milliseconds: this allows
71: * to minimize the rbtree operations for fast connections.
72: */
73:
74: diff = (ngx_msec_int_t) (key - ev->timer.key);
75:
76: if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
77: ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
78: "event timer: %d, old: %M, new: %M",
79: ngx_event_ident(ev->data), ev->timer.key, key);
80: return;
81: }
82:
83: ngx_del_timer(ev);
84: }
85:
86: ev->timer.key = key;
87:
88: ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
89: "event timer add: %d: %M:%M",
90: ngx_event_ident(ev->data), timer, ev->timer.key);
91:
92: ngx_mutex_lock(ngx_event_timer_mutex);
93:
94: ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
95:
96: ngx_mutex_unlock(ngx_event_timer_mutex);
97:
98: ev->timer_set = 1;
99: }
100:
101:
102: #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
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