3 * Copyright (C) Igor Sysoev
7 #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
8 #define _NGX_EVENT_TIMER_H_INCLUDED_
11 #include <ngx_config.h>
13 #include <ngx_event.h>
16 #define NGX_TIMER_INFINITE (ngx_msec_t) -1
18 #define NGX_TIMER_LAZY_DELAY 300
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);
27 extern ngx_mutex_t *ngx_event_timer_mutex;
31 extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
34 static ngx_inline void
35 ngx_event_del_timer(ngx_event_t *ev)
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);
41 ngx_mutex_lock(ngx_event_timer_mutex);
43 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
45 ngx_mutex_unlock(ngx_event_timer_mutex);
48 ev->timer.left = NULL;
49 ev->timer.right = NULL;
50 ev->timer.parent = NULL;
57 static ngx_inline void
58 ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
63 key = ngx_current_msec + timer;
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.
73 diff = (ngx_msec_int_t) (key - ev->timer.key);
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);
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);
91 ngx_mutex_lock(ngx_event_timer_mutex);
93 ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
95 ngx_mutex_unlock(ngx_event_timer_mutex);
101 #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */