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view src/event/ngx_event_posted.h @ 4569:1db899642518

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Upstream: reject upstreams without normal servers. Such upstreams cause CPU hog later in the code as number of peers isn't expected to be 0. Currently this may happen either if there are only backup servers defined in an upstream block, or if server with ipv6 address used in an upstream block.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 02 Apr 2012 21:29:35 +0000
parents d620f497c50f
children 3377f9459e99
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_EVENT_POSTED_H_INCLUDED_
#define _NGX_EVENT_POSTED_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>


#if (NGX_THREADS)
extern ngx_mutex_t  *ngx_posted_events_mutex;
#endif


#define ngx_locked_post_event(ev, queue)                                      \
                                                                              \
    if (ev->prev == NULL) {                                                   \
        ev->next = (ngx_event_t *) *queue;                                    \
        ev->prev = (ngx_event_t **) queue;                                    \
        *queue = ev;                                                          \
                                                                              \
        if (ev->next) {                                                       \
            ev->next->prev = &ev->next;                                       \
        }                                                                     \
                                                                              \
        ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "post event %p", ev);  \
                                                                              \
    } else  {                                                                 \
        ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,                        \
                       "update posted event %p", ev);                         \
    }


#define ngx_post_event(ev, queue)                                             \
                                                                              \
    ngx_mutex_lock(ngx_posted_events_mutex);                                  \
    ngx_locked_post_event(ev, queue);                                         \
    ngx_mutex_unlock(ngx_posted_events_mutex);


#define ngx_delete_posted_event(ev)                                           \
                                                                              \
    *(ev->prev) = ev->next;                                                   \
                                                                              \
    if (ev->next) {                                                           \
        ev->next->prev = ev->prev;                                            \
    }                                                                         \
                                                                              \
    ev->prev = NULL;                                                          \
    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,                            \
                   "delete posted event %p", ev);



void ngx_event_process_posted(ngx_cycle_t *cycle,
    ngx_thread_volatile ngx_event_t **posted);
void ngx_wakeup_worker_thread(ngx_cycle_t *cycle);

#if (NGX_THREADS)
ngx_int_t ngx_event_thread_process_posted(ngx_cycle_t *cycle);
#endif


extern ngx_thread_volatile ngx_event_t  *ngx_posted_accept_events;
extern ngx_thread_volatile ngx_event_t  *ngx_posted_events;


#endif /* _NGX_EVENT_POSTED_H_INCLUDED_ */