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0
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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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42
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21 ngx_int_t
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22 ngx_event_timer_init(ngx_log_t *log)
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0
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23 {
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24 if (ngx_event_timer_rbtree) {
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25 #if (NGX_THREADS)
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26 ngx_event_timer_mutex->log = log;
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27 #endif
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28 return NGX_OK;
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29 }
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30
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31 ngx_event_timer_rbtree = &ngx_event_timer_sentinel;
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32
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33 #if (NGX_THREADS)
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34 if (!(ngx_event_timer_mutex = ngx_mutex_init(log, 0))) {
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35 return NGX_ERROR;
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36 }
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37 #endif
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38
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39 return NGX_OK;
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40 }
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41
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42
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42
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43 ngx_msec_t
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44 ngx_event_find_timer(void)
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0
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45 {
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46 ngx_msec_t timer;
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47 ngx_rbtree_t *node;
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48
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49 if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
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50 return NGX_TIMER_INFINITE;
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51 }
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52
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53 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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54 return NGX_TIMER_ERROR;
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55 }
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56
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57 node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree,
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58 &ngx_event_timer_sentinel);
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59
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60 ngx_mutex_unlock(ngx_event_timer_mutex);
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61
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62 timer = (ngx_msec_t)
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63 (node->key * NGX_TIMER_RESOLUTION -
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64 ngx_elapsed_msec / NGX_TIMER_RESOLUTION * NGX_TIMER_RESOLUTION);
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65 #if 0
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66 (node->key * NGX_TIMER_RESOLUTION - ngx_elapsed_msec);
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67 #endif
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68
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69 return timer > 0 ? timer: 0 ;
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70 }
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71
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72
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42
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73 void
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74 ngx_event_expire_timers(ngx_msec_t timer)
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0
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75 {
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76 ngx_event_t *ev;
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77 ngx_rbtree_t *node;
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78
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79 if (timer < 0) {
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80 /* avoid the endless loop if the time goes backward for some reason */
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81 timer = 0;
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82 }
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83
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84 for ( ;; ) {
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85
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86 if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
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87 return;
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88 }
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89
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90 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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91 return;
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92 }
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93
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94 node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree,
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95 &ngx_event_timer_sentinel);
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96
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97 if (node->key <= (ngx_msec_t)
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98 (ngx_old_elapsed_msec + timer) / NGX_TIMER_RESOLUTION)
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99 {
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100 ev = (ngx_event_t *)
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101 ((char *) node - offsetof(ngx_event_t, rbtree_key));
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102
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103 #if (NGX_THREADS)
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104
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105 if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
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106
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107 /*
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108 * We can not change the timer of the event that is been
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109 * handling by another thread. And we can not easy walk
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110 * the rbtree to find a next expired timer so we exit the loop.
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111 * However it should be rare case when the event that is
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112 * been handling has expired timer.
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113 */
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114
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115 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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116 "event %p is busy in expire timers", ev);
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0
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117 break;
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118 }
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119 #endif
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120
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121 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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122 "event timer del: %d: %i",
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0
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123 ngx_event_ident(ev->data), ev->rbtree_key);
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124
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125 ngx_rbtree_delete((ngx_rbtree_t **) &ngx_event_timer_rbtree,
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126 &ngx_event_timer_sentinel,
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127 (ngx_rbtree_t *) &ev->rbtree_key);
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128
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129 ngx_mutex_unlock(ngx_event_timer_mutex);
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130
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131 #if (NGX_DEBUG)
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132 ev->rbtree_left = NULL;
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133 ev->rbtree_right = NULL;
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134 ev->rbtree_parent = NULL;
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135 #endif
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136
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137 ev->timer_set = 0;
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138
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139 #if (NGX_THREADS)
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140 if (ngx_threaded) {
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141 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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142 return;
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143 }
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144
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145 ev->posted_timedout = 1;
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146 ngx_post_event(ev);
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147
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148 ngx_mutex_unlock(ngx_posted_events_mutex);
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149
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150 ngx_unlock(ev->lock);
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151
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152 continue;
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153 }
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154 #endif
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155
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156 ev->timedout = 1;
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157
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158 ev->event_handler(ev);
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159
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160 continue;
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161 }
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162
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163 break;
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164 }
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165
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166 ngx_mutex_unlock(ngx_event_timer_mutex);
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167 }
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