Mercurial > hg > nginx
view src/os/unix/ngx_os.h @ 9143:48691bab4474
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 | 56fc55e32f23 |
children | 3d455e37abf8 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_OS_H_INCLUDED_ #define _NGX_OS_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #define NGX_IO_SENDFILE 1 typedef ssize_t (*ngx_recv_pt)(ngx_connection_t *c, u_char *buf, size_t size); typedef ssize_t (*ngx_recv_chain_pt)(ngx_connection_t *c, ngx_chain_t *in, off_t limit); typedef ssize_t (*ngx_send_pt)(ngx_connection_t *c, u_char *buf, size_t size); typedef ngx_chain_t *(*ngx_send_chain_pt)(ngx_connection_t *c, ngx_chain_t *in, off_t limit); typedef struct { ngx_recv_pt recv; ngx_recv_chain_pt recv_chain; ngx_recv_pt udp_recv; ngx_send_pt send; ngx_send_pt udp_send; ngx_send_chain_pt udp_send_chain; ngx_send_chain_pt send_chain; ngx_uint_t flags; } ngx_os_io_t; ngx_int_t ngx_os_init(ngx_log_t *log); void ngx_os_status(ngx_log_t *log); ngx_int_t ngx_os_specific_init(ngx_log_t *log); void ngx_os_specific_status(ngx_log_t *log); ngx_int_t ngx_daemon(ngx_log_t *log); ngx_int_t ngx_os_signal_process(ngx_cycle_t *cycle, char *sig, ngx_pid_t pid); ssize_t ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size); ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *entry, off_t limit); ssize_t ngx_udp_unix_recv(ngx_connection_t *c, u_char *buf, size_t size); ssize_t ngx_unix_send(ngx_connection_t *c, u_char *buf, size_t size); ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit); ssize_t ngx_udp_unix_send(ngx_connection_t *c, u_char *buf, size_t size); ngx_chain_t *ngx_udp_unix_sendmsg_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit); #if (IOV_MAX > 64) #define NGX_IOVS_PREALLOCATE 64 #else #define NGX_IOVS_PREALLOCATE IOV_MAX #endif typedef struct { struct iovec *iovs; ngx_uint_t count; size_t size; ngx_uint_t nalloc; } ngx_iovec_t; ngx_chain_t *ngx_output_chain_to_iovec(ngx_iovec_t *vec, ngx_chain_t *in, size_t limit, ngx_log_t *log); ssize_t ngx_writev(ngx_connection_t *c, ngx_iovec_t *vec); extern ngx_os_io_t ngx_os_io; extern ngx_int_t ngx_ncpu; extern ngx_int_t ngx_max_sockets; extern ngx_uint_t ngx_inherited_nonblocking; extern ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush; #if (NGX_FREEBSD) #include <ngx_freebsd.h> #elif (NGX_LINUX) #include <ngx_linux.h> #elif (NGX_SOLARIS) #include <ngx_solaris.h> #elif (NGX_DARWIN) #include <ngx_darwin.h> #endif #endif /* _NGX_OS_H_INCLUDED_ */