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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#if (NGX_THREADS)
ngx_mutex_t *ngx_event_timer_mutex;
#endif
ngx_thread_volatile ngx_rbtree_t *ngx_event_timer_rbtree;
ngx_rbtree_t ngx_event_timer_sentinel;
ngx_int_t ngx_event_timer_init(ngx_log_t *log)
{
if (ngx_event_timer_rbtree) {
#if (NGX_THREADS)
ngx_event_timer_mutex->log = log;
#endif
return NGX_OK;
}
ngx_event_timer_rbtree = &ngx_event_timer_sentinel;
#if (NGX_THREADS)
if (!(ngx_event_timer_mutex = ngx_mutex_init(log, 0))) {
return NGX_ERROR;
}
#endif
return NGX_OK;
}
ngx_msec_t ngx_event_find_timer(void)
{
ngx_msec_t timer;
ngx_rbtree_t *node;
if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
return NGX_TIMER_INFINITE;
}
if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
return NGX_TIMER_ERROR;
}
node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree,
&ngx_event_timer_sentinel);
ngx_mutex_unlock(ngx_event_timer_mutex);
timer = (ngx_msec_t)
(node->key * NGX_TIMER_RESOLUTION -
ngx_elapsed_msec / NGX_TIMER_RESOLUTION * NGX_TIMER_RESOLUTION);
#if 0
(node->key * NGX_TIMER_RESOLUTION - ngx_elapsed_msec);
#endif
return timer > 0 ? timer: 0 ;
}
void ngx_event_expire_timers(ngx_msec_t timer)
{
ngx_event_t *ev;
ngx_rbtree_t *node;
if (timer < 0) {
/* avoid the endless loop if the time goes backward for some reason */
timer = 0;
}
for ( ;; ) {
if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
return;
}
if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
return;
}
node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree,
&ngx_event_timer_sentinel);
if (node->key <= (ngx_msec_t)
(ngx_old_elapsed_msec + timer) / NGX_TIMER_RESOLUTION)
{
ev = (ngx_event_t *)
((char *) node - offsetof(ngx_event_t, rbtree_key));
#if (NGX_THREADS)
if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
/*
* We can not change the timer of the event that is been
* handling by another thread. And we can not easy walk
* the rbtree to find a next expired timer so we exit the loop.
* However it should be rare case when the event that is
* been handling has expired timer.
*/
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event %p is busy in expire timers", ev);
break;
}
#endif
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer del: %d: %i",
ngx_event_ident(ev->data), ev->rbtree_key);
ngx_rbtree_delete((ngx_rbtree_t **) &ngx_event_timer_rbtree,
&ngx_event_timer_sentinel,
(ngx_rbtree_t *) &ev->rbtree_key);
ngx_mutex_unlock(ngx_event_timer_mutex);
#if (NGX_DEBUG)
ev->rbtree_left = NULL;
ev->rbtree_right = NULL;
ev->rbtree_parent = NULL;
#endif
ev->timer_set = 0;
#if (NGX_THREADS)
if (ngx_threaded) {
if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
return;
}
ev->posted_timedout = 1;
ngx_post_event(ev);
ngx_mutex_unlock(ngx_posted_events_mutex);
ngx_unlock(ev->lock);
continue;
}
#endif
ev->timedout = 1;
ev->event_handler(ev);
continue;
}
break;
}
ngx_mutex_unlock(ngx_event_timer_mutex);
}
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