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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
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8 #define _NGX_EVENT_TIMER_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_event.h>
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14
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15
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50
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16 #define NGX_TIMER_INFINITE (ngx_msec_t) -1
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17 #define NGX_TIMER_ERROR (ngx_msec_t) -2
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0
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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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0
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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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0
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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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32 extern ngx_thread_volatile ngx_rbtree_t *ngx_event_timer_rbtree;
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33 extern ngx_rbtree_t ngx_event_timer_sentinel;
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34
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35
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42
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36 static ngx_inline void
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37 ngx_event_del_timer(ngx_event_t *ev)
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0
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38 {
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39 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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40 "event timer del: %d: %M",
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41 ngx_event_ident(ev->data), ev->rbtree_key);
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42
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43 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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44 return;
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45 }
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46
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47 ngx_rbtree_delete((ngx_rbtree_t **) &ngx_event_timer_rbtree,
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48 &ngx_event_timer_sentinel,
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49 (ngx_rbtree_t *) &ev->rbtree_key);
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50
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51 ngx_mutex_unlock(ngx_event_timer_mutex);
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52
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53 #if (NGX_DEBUG)
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54 ev->rbtree_left = NULL;
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55 ev->rbtree_right = NULL;
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56 ev->rbtree_parent = NULL;
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57 #endif
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58
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59 ev->timer_set = 0;
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60 }
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61
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62
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42
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63 static ngx_inline void
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64 ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
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65 {
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106
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66 ngx_rbtree_key_t key;
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67 ngx_rbtree_key_int_t diff;
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68
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106
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69 key = ngx_current_time + timer;
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70
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71 if (ev->timer_set) {
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72
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73 /*
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74 * Use the previous timer value if a difference between them is less
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42
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75 * then NGX_TIMER_LAZY_DELAY milliseconds. It allows to minimize
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76 * the rbtree operations for the fast connections.
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77 */
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78
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106
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79 diff = (ngx_rbtree_key_int_t) (key - ev->rbtree_key);
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80
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81 if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
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82 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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83 "event timer: %d, old: %M, new: %M",
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0
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84 ngx_event_ident(ev->data), ev->rbtree_key, key);
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85 return;
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86 }
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87
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88 ngx_del_timer(ev);
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89 }
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90
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91 ev->rbtree_key = key;
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92
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106
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93 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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94 "event timer add: %d: %M:%M",
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95 ngx_event_ident(ev->data), timer, ev->rbtree_key);
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0
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96
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97 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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98 return;
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99 }
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100
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101 ngx_rbtree_insert((ngx_rbtree_t **) &ngx_event_timer_rbtree,
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102 &ngx_event_timer_sentinel,
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103 (ngx_rbtree_t *) &ev->rbtree_key);
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104
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105 ngx_mutex_unlock(ngx_event_timer_mutex);
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106
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107 ev->timer_set = 1;
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108 }
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109
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110
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111 #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
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