view src/event/ngx_event_timer.h @ 4728:fc62b72f7597 stable-1.2

Merge of r4690: conflicting wildcard server names fix. With previous code wildcard names were added to hash even if conflict was detected. This resulted in identical names in hash and segfault later in ngx_hash_wildcard_init().
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 02 Jul 2012 16:59:34 +0000
parents d620f497c50f
children 1f513d7f1b45
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#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_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);

    ngx_mutex_lock(ngx_event_timer_mutex);

    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_msec_t      key;
    ngx_msec_int_t  diff;

    key = ngx_current_msec + timer;

    if (ev->timer_set) {

        /*
         * Use a previous timer value if difference between it and a new
         * value is less than NGX_TIMER_LAZY_DELAY milliseconds: this allows
         * to minimize the rbtree operations for fast connections.
         */

        diff = (ngx_msec_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);

    ngx_mutex_lock(ngx_event_timer_mutex);

    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_ */