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