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annotate src/os/unix/ngx_channel.h @ 9143:48691bab4474

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QUIC: fixed probe-congestion deadlock. When probe timeout expired while congestion window was exhausted, probe PINGs could not be sent. As a result, lost packets could not be declared lost and congestion window could not be freed for new packets. This deadlock continued until connection idle timeout expiration. Now PINGs are sent separately from the frame queue without congestion control, as specified by RFC 9002, Section 7: An endpoint MUST NOT send a packet if it would cause bytes_in_flight (see Appendix B.2) to be larger than the congestion window, unless the packet is sent on a PTO timer expiration (see Section 6.2) or when entering recovery (see Section 7.3.2).
author Roman Arutyunyan <arut@nginx.com>
date Mon, 14 Aug 2023 08:28:30 +0400
parents 2cd019520210
children
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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3 * Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_CHANNEL_H_INCLUDED_
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9 #define _NGX_CHANNEL_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_event.h>
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17 typedef struct {
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18 ngx_uint_t command;
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19 ngx_pid_t pid;
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20 ngx_int_t slot;
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21 ngx_fd_t fd;
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22 } ngx_channel_t;
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25 ngx_int_t ngx_write_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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26 ngx_log_t *log);
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27 ngx_int_t ngx_read_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
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28 ngx_log_t *log);
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29 ngx_int_t ngx_add_channel_event(ngx_cycle_t *cycle, ngx_fd_t fd,
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30 ngx_int_t event, ngx_event_handler_pt handler);
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b670db10cbbd nginx-0.0.7-2004-07-14-20:01:42 import
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31 void ngx_close_channel(ngx_fd_t *fd, ngx_log_t *log);
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34 #endif /* _NGX_CHANNEL_H_INCLUDED_ */