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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
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9 #define _NGX_EVENT_TIMER_H_INCLUDED_
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10
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11
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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14 #include <ngx_event.h>
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15
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16
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50
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17 #define NGX_TIMER_INFINITE (ngx_msec_t) -1
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18
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42
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19 #define NGX_TIMER_LAZY_DELAY 300
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20
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21
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22 ngx_int_t ngx_event_timer_init(ngx_log_t *log);
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23 ngx_msec_t ngx_event_find_timer(void);
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106
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24 void ngx_event_expire_timers(void);
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25
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26
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27 #if (NGX_THREADS)
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28 extern ngx_mutex_t *ngx_event_timer_mutex;
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29 #endif
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30
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31
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108
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32 extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
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33
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34
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42
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35 static ngx_inline void
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36 ngx_event_del_timer(ngx_event_t *ev)
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37 {
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38 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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39 "event timer del: %d: %M",
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108
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40 ngx_event_ident(ev->data), ev->timer.key);
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41
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112
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42 ngx_mutex_lock(ngx_event_timer_mutex);
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43
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108
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44 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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45
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46 ngx_mutex_unlock(ngx_event_timer_mutex);
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47
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48 #if (NGX_DEBUG)
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108
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49 ev->timer.left = NULL;
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50 ev->timer.right = NULL;
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51 ev->timer.parent = NULL;
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52 #endif
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53
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54 ev->timer_set = 0;
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55 }
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56
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57
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42
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58 static ngx_inline void
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59 ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
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60 {
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110
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61 ngx_msec_t key;
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62 ngx_msec_int_t diff;
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63
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112
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64 key = ngx_current_msec + timer;
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65
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66 if (ev->timer_set) {
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67
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68 /*
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69 * Use a previous timer value if difference between it and a new
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70 * value is less than NGX_TIMER_LAZY_DELAY milliseconds: this allows
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71 * to minimize the rbtree operations for fast connections.
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72 */
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73
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110
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74 diff = (ngx_msec_int_t) (key - ev->timer.key);
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106
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75
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76 if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
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77 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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78 "event timer: %d, old: %M, new: %M",
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108
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79 ngx_event_ident(ev->data), ev->timer.key, key);
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80 return;
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81 }
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82
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83 ngx_del_timer(ev);
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84 }
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85
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108
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86 ev->timer.key = key;
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87
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88 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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89 "event timer add: %d: %M:%M",
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90 ngx_event_ident(ev->data), timer, ev->timer.key);
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91
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112
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92 ngx_mutex_lock(ngx_event_timer_mutex);
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93
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108
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94 ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
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95
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96 ngx_mutex_unlock(ngx_event_timer_mutex);
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97
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98 ev->timer_set = 1;
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99 }
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100
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101
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102 #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
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