Mercurial > hg > nginx
annotate src/mail/ngx_mail_imap_module.h @ 7281:bd6563e81cea
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> |
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date | Wed, 30 May 2018 15:40:34 +0300 |
parents | d620f497c50f |
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rev | line source |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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6 |
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8 #ifndef _NGX_MAIL_IMAP_MODULE_H_INCLUDED_ |
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9 #define _NGX_MAIL_IMAP_MODULE_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 #include <ngx_mail.h> |
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17 typedef struct { |
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18 size_t client_buffer_size; |
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20 ngx_str_t capability; |
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21 ngx_str_t starttls_capability; |
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22 ngx_str_t starttls_only_capability; |
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24 ngx_uint_t auth_methods; |
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26 ngx_array_t capabilities; |
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27 } ngx_mail_imap_srv_conf_t; |
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30 void ngx_mail_imap_init_session(ngx_mail_session_t *s, ngx_connection_t *c); |
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31 void ngx_mail_imap_init_protocol(ngx_event_t *rev); |
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32 void ngx_mail_imap_auth_state(ngx_event_t *rev); |
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33 ngx_int_t ngx_mail_imap_parse_command(ngx_mail_session_t *s); |
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34 |
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36 extern ngx_module_t ngx_mail_imap_module; |
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37 |
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parents:
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38 |
f69493e8faab
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Igor Sysoev <igor@sysoev.ru>
parents:
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39 #endif /* _NGX_MAIL_IMAP_MODULE_H_INCLUDED_ */ |