Mercurial > hg > nginx
annotate src/core/ngx_rwlock.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 | d1816a2696de |
| children |
| rev | line source |
|---|---|
| 6101 | 1 |
| 2 /* | |
| 3 * Copyright (C) Ruslan Ermilov | |
| 4 * Copyright (C) Nginx, Inc. | |
| 5 */ | |
| 6 | |
| 7 | |
| 8 #ifndef _NGX_RWLOCK_H_INCLUDED_ | |
| 9 #define _NGX_RWLOCK_H_INCLUDED_ | |
| 10 | |
| 11 | |
| 12 #include <ngx_config.h> | |
| 13 #include <ngx_core.h> | |
| 14 | |
| 15 | |
| 16 void ngx_rwlock_wlock(ngx_atomic_t *lock); | |
| 17 void ngx_rwlock_rlock(ngx_atomic_t *lock); | |
| 18 void ngx_rwlock_unlock(ngx_atomic_t *lock); | |
|
7038
d1816a2696de
Introduced ngx_rwlock_downgrade().
Ruslan Ermilov <ru@nginx.com>
parents:
6101
diff
changeset
|
19 void ngx_rwlock_downgrade(ngx_atomic_t *lock); |
| 6101 | 20 |
| 21 | |
| 22 #endif /* _NGX_RWLOCK_H_INCLUDED_ */ |