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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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16 #define NGX_TIMER_INFINITE -1
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17 #define NGX_TIMER_ERROR -2
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18
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42
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19
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0
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20 /*
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21 * the 32-bit timer key value resolution
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22 *
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23 * 1 msec - 24 days
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24 * 10 msec - 8 months
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25 * 50 msec - 3 years 5 months
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26 * 100 msec - 6 years 10 months
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27 */
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28
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29 #define NGX_TIMER_RESOLUTION 1
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30
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42
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31 #define NGX_TIMER_LAZY_DELAY 300
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32
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0
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33
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34 ngx_int_t ngx_event_timer_init(ngx_log_t *log);
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35 ngx_msec_t ngx_event_find_timer(void);
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36 void ngx_event_expire_timers(ngx_msec_t timer);
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37
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38
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39 #if (NGX_THREADS)
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40 extern ngx_mutex_t *ngx_event_timer_mutex;
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41 #endif
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42
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43
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44 extern ngx_thread_volatile ngx_rbtree_t *ngx_event_timer_rbtree;
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45 extern ngx_rbtree_t ngx_event_timer_sentinel;
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46
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47
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42
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48 static ngx_inline void
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49 ngx_event_del_timer(ngx_event_t *ev)
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50 {
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51 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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52 "event timer del: %d: %d",
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53 ngx_event_ident(ev->data), ev->rbtree_key);
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54
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55 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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56 return;
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57 }
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58
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59 ngx_rbtree_delete((ngx_rbtree_t **) &ngx_event_timer_rbtree,
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60 &ngx_event_timer_sentinel,
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61 (ngx_rbtree_t *) &ev->rbtree_key);
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62
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63 ngx_mutex_unlock(ngx_event_timer_mutex);
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64
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65 #if (NGX_DEBUG)
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66 ev->rbtree_left = NULL;
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67 ev->rbtree_right = NULL;
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68 ev->rbtree_parent = NULL;
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69 #endif
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70
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71 ev->timer_set = 0;
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72 }
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73
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74
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42
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75 static ngx_inline void
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76 ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
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77 {
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78 ngx_int_t key;
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79
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80 key = (ngx_int_t)
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81 (ngx_elapsed_msec / NGX_TIMER_RESOLUTION * NGX_TIMER_RESOLUTION
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82 + timer) / NGX_TIMER_RESOLUTION;
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83 #if 0
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84 (ngx_elapsed_msec + timer) / NGX_TIMER_RESOLUTION;
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85 #endif
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86
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87 if (ev->timer_set) {
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88
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89 /*
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90 * Use the previous timer value if a difference between them is less
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91 * then NGX_TIMER_LAZY_DELAY milliseconds. It allows to minimize
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92 * the rbtree operations for the fast connections.
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93 */
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94
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95 if (abs(key - ev->rbtree_key)
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96 < NGX_TIMER_LAZY_DELAY / NGX_TIMER_RESOLUTION)
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97 {
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98 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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99 "event timer: %d, old: %i, new: %i",
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100 ngx_event_ident(ev->data), ev->rbtree_key, key);
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101 return;
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102 }
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103
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104 ngx_del_timer(ev);
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105 }
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106
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107 ev->rbtree_key = key;
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108
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109 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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110 "event timer add: %d: %i",
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111 ngx_event_ident(ev->data), ev->rbtree_key);
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112
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113 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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114 return;
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115 }
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116
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117 ngx_rbtree_insert((ngx_rbtree_t **) &ngx_event_timer_rbtree,
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118 &ngx_event_timer_sentinel,
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119 (ngx_rbtree_t *) &ev->rbtree_key);
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120
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121 ngx_mutex_unlock(ngx_event_timer_mutex);
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122
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123 ev->timer_set = 1;
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124 }
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125
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126
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127 #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
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