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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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274
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20 /*
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21 * the event timer rbtree may contain the duplicate keys, however,
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22 * it should not be a problem, because we use the rbtree to find
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23 * a minimum timer value only
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24 */
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0
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25
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42
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26 ngx_int_t
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27 ngx_event_timer_init(ngx_log_t *log)
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0
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28 {
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356
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29 ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
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30 ngx_rbtree_insert_timer_value);
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108
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31
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0
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32 #if (NGX_THREADS)
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108
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33
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34 if (ngx_event_timer_mutex) {
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0
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35 ngx_event_timer_mutex->log = log;
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36 return NGX_OK;
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37 }
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38
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50
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39 ngx_event_timer_mutex = ngx_mutex_init(log, 0);
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40 if (ngx_event_timer_mutex == NULL) {
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0
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41 return NGX_ERROR;
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42 }
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108
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43
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0
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44 #endif
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45
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46 return NGX_OK;
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47 }
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48
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49
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42
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50 ngx_msec_t
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51 ngx_event_find_timer(void)
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0
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52 {
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110
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53 ngx_msec_int_t timer;
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54 ngx_rbtree_node_t *node, *root, *sentinel;
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0
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55
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108
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56 if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
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0
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57 return NGX_TIMER_INFINITE;
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58 }
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59
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112
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60 ngx_mutex_lock(ngx_event_timer_mutex);
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0
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61
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108
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62 root = ngx_event_timer_rbtree.root;
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63 sentinel = ngx_event_timer_rbtree.sentinel;
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64
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65 node = ngx_rbtree_min(root, sentinel);
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0
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66
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67 ngx_mutex_unlock(ngx_event_timer_mutex);
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68
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112
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69 timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec;
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0
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70
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108
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71 return (ngx_msec_t) (timer > 0 ? timer : 0);
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72 }
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73
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74
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42
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75 void
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106
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76 ngx_event_expire_timers(void)
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0
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77 {
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108
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78 ngx_event_t *ev;
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79 ngx_rbtree_node_t *node, *root, *sentinel;
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80
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81 sentinel = ngx_event_timer_rbtree.sentinel;
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0
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82
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83 for ( ;; ) {
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84
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112
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85 ngx_mutex_lock(ngx_event_timer_mutex);
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0
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86
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108
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87 root = ngx_event_timer_rbtree.root;
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88
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89 if (root == sentinel) {
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90 return;
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91 }
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92
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93 node = ngx_rbtree_min(root, sentinel);
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0
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94
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106
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95 /* node->key <= ngx_current_time */
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96
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112
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97 if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
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0
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98 {
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108
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99 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
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0
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100
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101 #if (NGX_THREADS)
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102
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103 if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
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104
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105 /*
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106 * We can not change the timer of the event that is been
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107 * handling by another thread. And we can not easy walk
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108 * the rbtree to find a next expired timer so we exit the loop.
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109 * However it should be rare case when the event that is
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110 * been handling has expired timer.
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111 */
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112
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113 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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114 "event %p is busy in expire timers", ev);
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0
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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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106
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120 "event timer del: %d: %M",
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108
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121 ngx_event_ident(ev->data), ev->timer.key);
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0
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122
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108
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123 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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0
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124
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125 ngx_mutex_unlock(ngx_event_timer_mutex);
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126
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127 #if (NGX_DEBUG)
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108
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128 ev->timer.left = NULL;
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129 ev->timer.right = NULL;
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130 ev->timer.parent = NULL;
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0
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131 #endif
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132
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133 ev->timer_set = 0;
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134
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135 #if (NGX_THREADS)
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136 if (ngx_threaded) {
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112
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137 ev->posted_timedout = 1;
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0
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138
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112
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139 ngx_post_event(ev, &ngx_posted_events);
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0
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140
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141 ngx_unlock(ev->lock);
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142
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143 continue;
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144 }
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145 #endif
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146
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147 ev->timedout = 1;
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148
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58
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149 ev->handler(ev);
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0
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150
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151 continue;
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152 }
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153
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154 break;
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155 }
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156
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157 ngx_mutex_unlock(ngx_event_timer_mutex);
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158 }
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