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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 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 #if (NGX_THREADS)
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13 ngx_mutex_t *ngx_event_timer_mutex;
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14 #endif
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15
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16
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17 ngx_thread_volatile ngx_rbtree_t *ngx_event_timer_rbtree;
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18 ngx_rbtree_t ngx_event_timer_sentinel;
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19
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20
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21 ngx_int_t ngx_event_timer_init(ngx_log_t *log)
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22 {
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23 if (ngx_event_timer_rbtree) {
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24 #if (NGX_THREADS)
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25 ngx_event_timer_mutex->log = log;
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26 #endif
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27 return NGX_OK;
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28 }
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29
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30 ngx_event_timer_rbtree = &ngx_event_timer_sentinel;
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31
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32 #if (NGX_THREADS)
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33 if (!(ngx_event_timer_mutex = ngx_mutex_init(log, 0))) {
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34 return NGX_ERROR;
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35 }
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36 #endif
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37
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38 return NGX_OK;
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39 }
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40
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41
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42 ngx_msec_t ngx_event_find_timer(void)
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43 {
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44 ngx_msec_t timer;
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45 ngx_rbtree_t *node;
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46
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47 if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
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48 return NGX_TIMER_INFINITE;
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49 }
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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 NGX_TIMER_ERROR;
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53 }
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54
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55 node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree,
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56 &ngx_event_timer_sentinel);
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57
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58 ngx_mutex_unlock(ngx_event_timer_mutex);
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59
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60 timer = (ngx_msec_t)
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61 (node->key * NGX_TIMER_RESOLUTION -
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62 ngx_elapsed_msec / NGX_TIMER_RESOLUTION * NGX_TIMER_RESOLUTION);
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63 #if 0
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64 (node->key * NGX_TIMER_RESOLUTION - ngx_elapsed_msec);
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65 #endif
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66
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67 return timer > 0 ? timer: 0 ;
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68 }
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69
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70
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71 void ngx_event_expire_timers(ngx_msec_t timer)
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72 {
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73 ngx_event_t *ev;
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74 ngx_rbtree_t *node;
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75
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76 if (timer < 0) {
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77 /* avoid the endless loop if the time goes backward for some reason */
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78 timer = 0;
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79 }
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80
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81 for ( ;; ) {
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82
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83 if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
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84 return;
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85 }
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86
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87 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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88 return;
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89 }
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90
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91 node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree,
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92 &ngx_event_timer_sentinel);
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93
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94 if (node->key <= (ngx_msec_t)
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95 (ngx_old_elapsed_msec + timer) / NGX_TIMER_RESOLUTION)
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96 {
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97 ev = (ngx_event_t *)
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98 ((char *) node - offsetof(ngx_event_t, rbtree_key));
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99
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100 #if (NGX_THREADS)
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101
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102 if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
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103
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104 /*
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105 * We can not change the timer of the event that is been
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106 * handling by another thread. And we can not easy walk
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107 * the rbtree to find a next expired timer so we exit the loop.
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108 * However it should be rare case when the event that is
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109 * been handling has expired timer.
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110 */
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111
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112 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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113 "event " PTR_FMT " is busy in expire timers",
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114 ev);
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115 break;
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116 }
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117 #endif
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118
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119 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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120 "event timer del: %d: %d",
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121 ngx_event_ident(ev->data), ev->rbtree_key);
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122
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123 ngx_rbtree_delete((ngx_rbtree_t **) &ngx_event_timer_rbtree,
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124 &ngx_event_timer_sentinel,
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125 (ngx_rbtree_t *) &ev->rbtree_key);
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126
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127 ngx_mutex_unlock(ngx_event_timer_mutex);
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128
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129 #if (NGX_DEBUG)
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130 ev->rbtree_left = NULL;
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131 ev->rbtree_right = NULL;
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132 ev->rbtree_parent = NULL;
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133 #endif
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134
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135 ev->timer_set = 0;
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136
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137 #if (NGX_THREADS)
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138 if (ngx_threaded) {
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139 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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140 return;
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141 }
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142
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143 ev->posted_timedout = 1;
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144 ngx_post_event(ev);
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145
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146 ngx_mutex_unlock(ngx_posted_events_mutex);
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147
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148 ngx_unlock(ev->lock);
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149
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150 continue;
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151 }
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152 #endif
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153
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154 ev->timedout = 1;
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155
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156 ev->event_handler(ev);
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157
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158 continue;
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159 }
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160
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161 break;
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162 }
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163
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164 ngx_mutex_unlock(ngx_event_timer_mutex);
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165 }
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