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/*
* Copyright (C) Igor Sysoev
*/
#ifndef _NGX_EVENT_TIMER_H_INCLUDED_
#define _NGX_EVENT_TIMER_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#define NGX_TIMER_INFINITE (ngx_msec_t) -1
#define NGX_TIMER_ERROR (ngx_msec_t) -2
#define NGX_TIMER_LAZY_DELAY 300
ngx_int_t ngx_event_timer_init(ngx_log_t *log);
ngx_msec_t ngx_event_find_timer(void);
void ngx_event_expire_timers(void);
#if (NGX_THREADS)
extern ngx_mutex_t *ngx_event_timer_mutex;
#endif
extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
static ngx_inline void
ngx_event_del_timer(ngx_event_t *ev)
{
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer del: %d: %M",
ngx_event_ident(ev->data), ev->timer.key);
if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
return;
}
ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
ngx_mutex_unlock(ngx_event_timer_mutex);
#if (NGX_DEBUG)
ev->timer.left = NULL;
ev->timer.right = NULL;
ev->timer.parent = NULL;
#endif
ev->timer_set = 0;
}
static ngx_inline void
ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
{
ngx_rbtree_key_t key;
ngx_rbtree_key_int_t diff;
key = ngx_current_time + timer;
if (ev->timer_set) {
/*
* Use the previous timer value if a difference between them is less
* then NGX_TIMER_LAZY_DELAY milliseconds. It allows to minimize
* the rbtree operations for the fast connections.
*/
diff = (ngx_rbtree_key_int_t) (key - ev->timer.key);
if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer: %d, old: %M, new: %M",
ngx_event_ident(ev->data), ev->timer.key, key);
return;
}
ngx_del_timer(ev);
}
ev->timer.key = key;
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer add: %d: %M:%M",
ngx_event_ident(ev->data), timer, ev->timer.key);
if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) {
return;
}
ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
ngx_mutex_unlock(ngx_event_timer_mutex);
ev->timer_set = 1;
}
#endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
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