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view src/event/ngx_event_timer.h @ 8006:32b0ba4855a6

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HTTP/2: made it possible to flush response headers (ticket #1743). Response headers can be buffered in the SSL buffer. But stream's fake connection buffered flag did not reflect this, so any attempts to flush the buffer without sending additional data were stopped by the write filter. It does not seem to be possible to reflect this in fc->buffered though, as we never known if main connection's c->buffered corresponds to the particular stream or not. As such, fc->buffered might prevent request finalization due to sending data on some other stream. Fix is to implement handling of flush buffers when the c->need_flush_buf flag is set, similarly to the existing last buffer handling. The same flag is now used for UDP sockets in the stream module instead of explicit checking of c->type.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 03 Feb 2022 01:44:38 +0300
parents 3069dd358ba2
children
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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);
ngx_int_t ngx_event_no_timers_left(void);


extern 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_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);

#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_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);

    ev->timer_set = 1;
}


#endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */