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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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13 #if (NGX_THREADS)
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14 ngx_mutex_t *ngx_event_timer_mutex;
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15 #endif
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16
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17
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108
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18 ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
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19 static ngx_rbtree_node_t ngx_event_timer_sentinel;
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0
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20
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274
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21 /*
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22 * the event timer rbtree may contain the duplicate keys, however,
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23 * it should not be a problem, because we use the rbtree to find
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24 * a minimum timer value only
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25 */
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0
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26
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42
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27 ngx_int_t
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28 ngx_event_timer_init(ngx_log_t *log)
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0
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29 {
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356
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30 ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
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31 ngx_rbtree_insert_timer_value);
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108
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32
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33 #if (NGX_THREADS)
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108
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34
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35 if (ngx_event_timer_mutex) {
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36 ngx_event_timer_mutex->log = log;
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37 return NGX_OK;
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38 }
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39
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50
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40 ngx_event_timer_mutex = ngx_mutex_init(log, 0);
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41 if (ngx_event_timer_mutex == NULL) {
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42 return NGX_ERROR;
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43 }
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108
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44
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45 #endif
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46
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47 return NGX_OK;
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48 }
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49
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50
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42
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51 ngx_msec_t
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52 ngx_event_find_timer(void)
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0
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53 {
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110
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54 ngx_msec_int_t timer;
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55 ngx_rbtree_node_t *node, *root, *sentinel;
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0
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56
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108
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57 if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
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0
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58 return NGX_TIMER_INFINITE;
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59 }
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60
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112
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61 ngx_mutex_lock(ngx_event_timer_mutex);
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0
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62
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108
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63 root = ngx_event_timer_rbtree.root;
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64 sentinel = ngx_event_timer_rbtree.sentinel;
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65
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66 node = ngx_rbtree_min(root, sentinel);
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0
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67
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68 ngx_mutex_unlock(ngx_event_timer_mutex);
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69
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112
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70 timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec;
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0
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71
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108
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72 return (ngx_msec_t) (timer > 0 ? timer : 0);
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73 }
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74
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75
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42
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76 void
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106
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77 ngx_event_expire_timers(void)
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78 {
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108
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79 ngx_event_t *ev;
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80 ngx_rbtree_node_t *node, *root, *sentinel;
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81
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82 sentinel = ngx_event_timer_rbtree.sentinel;
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0
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83
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84 for ( ;; ) {
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85
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112
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86 ngx_mutex_lock(ngx_event_timer_mutex);
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0
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87
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108
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88 root = ngx_event_timer_rbtree.root;
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89
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90 if (root == sentinel) {
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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(root, sentinel);
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0
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95
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106
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96 /* node->key <= ngx_current_time */
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97
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112
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98 if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
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0
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99 {
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108
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100 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
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0
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101
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102 #if (NGX_THREADS)
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103
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104 if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
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105
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106 /*
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640
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107 * We cannot change the timer of the event that is being
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108 * handled by another thread. And we cannot easy walk
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109 * the rbtree to find next expired timer so we exit the loop.
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110 * However, it should be a rare case when the event that is
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111 * being handled has an expired timer.
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0
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112 */
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113
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114 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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115 "event %p is busy in expire timers", ev);
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0
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116 break;
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117 }
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118 #endif
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119
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120 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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121 "event timer del: %d: %M",
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108
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122 ngx_event_ident(ev->data), ev->timer.key);
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0
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123
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108
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124 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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0
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125
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126 ngx_mutex_unlock(ngx_event_timer_mutex);
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127
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128 #if (NGX_DEBUG)
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108
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129 ev->timer.left = NULL;
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130 ev->timer.right = NULL;
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131 ev->timer.parent = NULL;
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0
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132 #endif
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133
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134 ev->timer_set = 0;
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135
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136 #if (NGX_THREADS)
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137 if (ngx_threaded) {
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112
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138 ev->posted_timedout = 1;
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0
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139
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112
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140 ngx_post_event(ev, &ngx_posted_events);
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0
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141
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142 ngx_unlock(ev->lock);
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143
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144 continue;
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145 }
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146 #endif
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147
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148 ev->timedout = 1;
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149
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58
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150 ev->handler(ev);
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0
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151
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152 continue;
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153 }
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154
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155 break;
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156 }
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157
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158 ngx_mutex_unlock(ngx_event_timer_mutex);
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159 }
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