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* Copyright (C) Igor Sysoev
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#include <ngx_config.h>
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ngx_mutex_t *ngx_event_timer_mutex;
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ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
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static ngx_rbtree_node_t ngx_event_timer_sentinel;
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* the event timer rbtree may contain the duplicate keys, however,
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* it should not be a problem, because we use the rbtree to find
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* a minimum timer value only
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ngx_event_timer_init(ngx_log_t *log)
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ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
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ngx_rbtree_insert_timer_value);
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if (ngx_event_timer_mutex) {
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ngx_event_timer_mutex->log = log;
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ngx_event_timer_mutex = ngx_mutex_init(log, 0);
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if (ngx_event_timer_mutex == NULL) {
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ngx_event_find_timer(void)
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ngx_rbtree_node_t *node, *root, *sentinel;
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if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
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return NGX_TIMER_INFINITE;
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ngx_mutex_lock(ngx_event_timer_mutex);
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root = ngx_event_timer_rbtree.root;
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sentinel = ngx_event_timer_rbtree.sentinel;
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node = ngx_rbtree_min(root, sentinel);
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ngx_mutex_unlock(ngx_event_timer_mutex);
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timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec;
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return (ngx_msec_t) (timer > 0 ? timer : 0);
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ngx_event_expire_timers(void)
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ngx_rbtree_node_t *node, *root, *sentinel;
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sentinel = ngx_event_timer_rbtree.sentinel;
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ngx_mutex_lock(ngx_event_timer_mutex);
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root = ngx_event_timer_rbtree.root;
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if (root == sentinel) {
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node = ngx_rbtree_min(root, sentinel);
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/* node->key <= ngx_current_time */
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if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
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ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
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if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
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* We can not change the timer of the event that is been
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* handling by another thread. And we can not easy walk
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* the rbtree to find a next expired timer so we exit the loop.
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* However it should be rare case when the event that is
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* been handling has expired timer.
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"event %p is busy in expire timers", ev);
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"event timer del: %d: %M",
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ngx_event_ident(ev->data), ev->timer.key);
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ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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ngx_mutex_unlock(ngx_event_timer_mutex);
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ev->timer.left = NULL;
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ev->timer.right = NULL;
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ev->timer.parent = NULL;
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ev->posted_timedout = 1;
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ngx_post_event(ev, &ngx_posted_events);
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ngx_unlock(ev->lock);
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ngx_mutex_unlock(ngx_event_timer_mutex);