Mercurial > hg > nginx
annotate src/core/ngx_rwlock.h @ 9179:ea1f29c2010c
HTTP/2: fixed buffer management with HTTP/2 auto-detection.
As part of normal HTTP/2 processing, incomplete frames are saved in the
control state using a fixed size memcpy of NGX_HTTP_V2_STATE_BUFFER_SIZE.
For this matter, two state buffers are reserved in the HTTP/2 recv buffer.
As part of HTTP/2 auto-detection on plain TCP connections, initial data
is first read into a buffer specified by the client_header_buffer_size
directive that doesn't have state reservation. Previously, this made it
possible to over-read the buffer as part of saving the state.
The fix is to read the available buffer size rather than a fixed size.
Although memcpy of a fixed size can produce a better optimized code,
handling of incomplete frames isn't a common execution path, so it was
sacrificed for the sake of simplicity of the fix.
author | Sergey Kandaurov <pluknet@nginx.com> |
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date | Sat, 21 Oct 2023 18:48:24 +0400 |
parents | d1816a2696de |
children |
rev | line source |
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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_ */ |