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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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108
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17 ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
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18 static ngx_rbtree_node_t ngx_event_timer_sentinel;
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0
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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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108
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24 ngx_event_timer_rbtree.root = &ngx_event_timer_sentinel;
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25 ngx_event_timer_rbtree.sentinel = &ngx_event_timer_sentinel;
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26
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0
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27 #if (NGX_THREADS)
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108
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28
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29 if (ngx_event_timer_mutex) {
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0
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30 ngx_event_timer_mutex->log = log;
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31 return NGX_OK;
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32 }
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33
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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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108
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38
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0
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39 #endif
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40
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41 return NGX_OK;
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42 }
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43
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44
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42
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45 ngx_msec_t
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46 ngx_event_find_timer(void)
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0
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47 {
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110
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48 ngx_msec_int_t timer;
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49 ngx_rbtree_node_t *node, *root, *sentinel;
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0
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50
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108
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51 if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
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0
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52 return NGX_TIMER_INFINITE;
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53 }
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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 NGX_TIMER_ERROR;
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57 }
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58
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108
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59 root = ngx_event_timer_rbtree.root;
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60 sentinel = ngx_event_timer_rbtree.sentinel;
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61
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62 node = ngx_rbtree_min(root, sentinel);
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0
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63
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64 ngx_mutex_unlock(ngx_event_timer_mutex);
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65
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110
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66 timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_time;
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0
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67
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108
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68 return (ngx_msec_t) (timer > 0 ? timer : 0);
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0
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69 }
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70
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71
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42
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72 void
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106
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73 ngx_event_expire_timers(void)
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0
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74 {
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108
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75 ngx_event_t *ev;
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76 ngx_rbtree_node_t *node, *root, *sentinel;
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77
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78 sentinel = ngx_event_timer_rbtree.sentinel;
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0
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79
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80 for ( ;; ) {
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81
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82 if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
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83 return;
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84 }
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85
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108
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86 root = ngx_event_timer_rbtree.root;
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87
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88 if (root == sentinel) {
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89 return;
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90 }
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91
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92 node = ngx_rbtree_min(root, sentinel);
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0
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93
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106
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94 /* node->key <= ngx_current_time */
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95
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110
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96 if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_time <= 0)
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0
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97 {
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108
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98 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
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0
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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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10
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113 "event %p is busy in expire timers", ev);
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0
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114 break;
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115 }
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116 #endif
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117
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118 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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119 "event timer del: %d: %M",
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108
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120 ngx_event_ident(ev->data), ev->timer.key);
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0
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121
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108
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122 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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0
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123
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124 ngx_mutex_unlock(ngx_event_timer_mutex);
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125
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126 #if (NGX_DEBUG)
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108
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127 ev->timer.left = NULL;
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128 ev->timer.right = NULL;
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129 ev->timer.parent = NULL;
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0
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130 #endif
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131
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132 ev->timer_set = 0;
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133
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134 #if (NGX_THREADS)
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135 if (ngx_threaded) {
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136 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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137 return;
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138 }
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139
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140 ev->posted_timedout = 1;
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141 ngx_post_event(ev);
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142
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143 ngx_mutex_unlock(ngx_posted_events_mutex);
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144
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145 ngx_unlock(ev->lock);
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146
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147 continue;
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148 }
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149 #endif
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150
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151 ev->timedout = 1;
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152
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58
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153 ev->handler(ev);
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0
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154
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155 continue;
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156 }
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157
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158 break;
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159 }
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160
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161 ngx_mutex_unlock(ngx_event_timer_mutex);
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162 }
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