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