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Limit req: improved handling of negative times. Negative times can appear since workers only update time on an event loop iteration start. If a worker was blocked for a long time during an event loop iteration, it is possible that another worker already updated the time stored in the node. As such, time since last update of the node (ms) will be negative. Previous code used ngx_abs(ms) in the calculations. That is, negative times were effectively treated as positive ones. As a result, it was not possible to maintain high request rates, where the same node can be updated multiple times from during an event loop iteration. In particular, this affected setups with many SSL handshakes, see http://mailman.nginx.org/pipermail/nginx/2018-May/056291.html. Fix is to only update the last update time stored in the node if the new time is larger than previously stored one. If a future time is stored in the node, we preserve this time as is. To prevent breaking things on platforms without monotonic time available if system time is updated backwards, a safety limit of 60 seconds is used. If the time stored in the node is more than 60 seconds in the future, we assume that the time was changed backwards and update lr->last to the current time.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 30 May 2018 15:40:34 +0300
parents d620f497c50f
children deebe988cbd7
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_HTTP_PERL_MODULE_H_INCLUDED_
#define _NGX_HTTP_PERL_MODULE_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <nginx.h>

#include <EXTERN.h>
#include <perl.h>


typedef ngx_http_request_t   *nginx;

typedef struct {
    ngx_str_t                 filename;
    ngx_str_t                 redirect_uri;
    ngx_str_t                 redirect_args;

    SV                       *next;

    ngx_uint_t                done;       /* unsigned  done:1; */

    ngx_array_t              *variables;  /* array of ngx_http_perl_var_t */

#if (NGX_HTTP_SSI)
    ngx_http_ssi_ctx_t       *ssi;
#endif
} ngx_http_perl_ctx_t;


typedef struct {
    ngx_uint_t    hash;
    ngx_str_t     name;
    ngx_str_t     value;
} ngx_http_perl_var_t;


extern ngx_module_t  ngx_http_perl_module;


/*
 * workaround for "unused variable `Perl___notused'" warning
 * when building with perl 5.6.1
 */
#ifndef PERL_IMPLICIT_CONTEXT
#undef  dTHXa
#define dTHXa(a)
#endif


extern void boot_DynaLoader(pTHX_ CV* cv);


void ngx_http_perl_handle_request(ngx_http_request_t *r);
void ngx_http_perl_sleep_handler(ngx_http_request_t *r);


#endif /* _NGX_HTTP_PERL_MODULE_H_INCLUDED_ */