Mercurial > hg > nginx
annotate src/event/ngx_event_timer.c @ 1966:fb02f63eafd6
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author | Igor Sysoev <igor@sysoev.ru> |
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date | Thu, 10 Apr 2008 17:26:14 +0000 |
parents | 4fc402c3ec73 |
children | 59b99f217c6d |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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50
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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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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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16 |
559 | 17 ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree; |
18 static ngx_rbtree_node_t ngx_event_timer_sentinel; | |
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19 |
1022 | 20 /* |
21 * the event timer rbtree may contain the duplicate keys, however, | |
22 * it should not be a problem, because we use the rbtree to find | |
23 * a minimum timer value only | |
24 */ | |
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25 |
493 | 26 ngx_int_t |
27 ngx_event_timer_init(ngx_log_t *log) | |
205
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28 { |
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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); |
559 | 31 |
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32 #if (NGX_THREADS) |
559 | 33 |
34 if (ngx_event_timer_mutex) { | |
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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 |
501 | 39 ngx_event_timer_mutex = ngx_mutex_init(log, 0); |
40 if (ngx_event_timer_mutex == NULL) { | |
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41 return NGX_ERROR; |
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42 } |
559 | 43 |
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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 |
493 | 50 ngx_msec_t |
51 ngx_event_find_timer(void) | |
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52 { |
561 | 53 ngx_msec_int_t timer; |
54 ngx_rbtree_node_t *node, *root, *sentinel; | |
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55 |
559 | 56 if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) { |
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57 return NGX_TIMER_INFINITE; |
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58 } |
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59 |
563 | 60 ngx_mutex_lock(ngx_event_timer_mutex); |
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61 |
559 | 62 root = ngx_event_timer_rbtree.root; |
63 sentinel = ngx_event_timer_rbtree.sentinel; | |
64 | |
65 node = ngx_rbtree_min(root, sentinel); | |
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66 |
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67 ngx_mutex_unlock(ngx_event_timer_mutex); |
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68 |
563 | 69 timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec; |
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70 |
559 | 71 return (ngx_msec_t) (timer > 0 ? timer : 0); |
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72 } |
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73 |
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74 |
493 | 75 void |
557 | 76 ngx_event_expire_timers(void) |
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77 { |
559 | 78 ngx_event_t *ev; |
79 ngx_rbtree_node_t *node, *root, *sentinel; | |
80 | |
81 sentinel = ngx_event_timer_rbtree.sentinel; | |
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82 |
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83 for ( ;; ) { |
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84 |
563 | 85 ngx_mutex_lock(ngx_event_timer_mutex); |
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86 |
559 | 87 root = ngx_event_timer_rbtree.root; |
88 | |
89 if (root == sentinel) { | |
90 return; | |
91 } | |
92 | |
93 node = ngx_rbtree_min(root, sentinel); | |
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94 |
557 | 95 /* node->key <= ngx_current_time */ |
96 | |
563 | 97 if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0) |
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98 { |
559 | 99 ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer)); |
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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, |
461 | 114 "event %p is busy in expire timers", ev); |
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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, |
557 | 120 "event timer del: %d: %M", |
559 | 121 ngx_event_ident(ev->data), ev->timer.key); |
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122 |
559 | 123 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer); |
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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) |
559 | 128 ev->timer.left = NULL; |
129 ev->timer.right = NULL; | |
130 ev->timer.parent = NULL; | |
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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) { |
563 | 137 ev->posted_timedout = 1; |
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138 |
563 | 139 ngx_post_event(ev, &ngx_posted_events); |
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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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nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
372
diff
changeset
|
147 ev->timedout = 1; |
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
372
diff
changeset
|
148 |
509 | 149 ev->handler(ev); |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
372
diff
changeset
|
150 |
205
4a9a2b1dd6fa
nginx-0.0.1-2003-12-04-17:53:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
151 continue; |
4a9a2b1dd6fa
nginx-0.0.1-2003-12-04-17:53:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
152 } |
374
213f17e9f776
nginx-0.0.7-2004-07-02-09:47:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
372
diff
changeset
|
153 |
205
4a9a2b1dd6fa
nginx-0.0.1-2003-12-04-17:53:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
154 break; |
4a9a2b1dd6fa
nginx-0.0.1-2003-12-04-17:53:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
155 } |
371
780e93985b93
nginx-0.0.7-2004-06-28-20:05:02 import
Igor Sysoev <igor@sysoev.ru>
parents:
361
diff
changeset
|
156 |
780e93985b93
nginx-0.0.7-2004-06-28-20:05:02 import
Igor Sysoev <igor@sysoev.ru>
parents:
361
diff
changeset
|
157 ngx_mutex_unlock(ngx_event_timer_mutex); |
205
4a9a2b1dd6fa
nginx-0.0.1-2003-12-04-17:53:00 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
158 } |