Mercurial > hg > nginx
view src/os/unix/ngx_time.c @ 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 | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> /* * FreeBSD does not test /etc/localtime change, however, we can workaround it * by calling tzset() with TZ and then without TZ to update timezone. * The trick should work since FreeBSD 2.1.0. * * Linux does not test /etc/localtime change in localtime(), * but may stat("/etc/localtime") several times in every strftime(), * therefore we use it to update timezone. * * Solaris does not test /etc/TIMEZONE change too and no workaround available. */ void ngx_timezone_update(void) { #if (NGX_FREEBSD) if (getenv("TZ")) { return; } putenv("TZ=UTC"); tzset(); unsetenv("TZ"); tzset(); #elif (NGX_LINUX) time_t s; struct tm *t; char buf[4]; s = time(0); t = localtime(&s); strftime(buf, 4, "%H", t); #endif } void ngx_localtime(time_t s, ngx_tm_t *tm) { #if (NGX_HAVE_LOCALTIME_R) (void) localtime_r(&s, tm); #else ngx_tm_t *t; t = localtime(&s); *tm = *t; #endif tm->ngx_tm_mon++; tm->ngx_tm_year += 1900; } void ngx_libc_localtime(time_t s, struct tm *tm) { #if (NGX_HAVE_LOCALTIME_R) (void) localtime_r(&s, tm); #else struct tm *t; t = localtime(&s); *tm = *t; #endif } void ngx_libc_gmtime(time_t s, struct tm *tm) { #if (NGX_HAVE_LOCALTIME_R) (void) gmtime_r(&s, tm); #else struct tm *t; t = gmtime(&s); *tm = *t; #endif }