Mercurial > hg > nginx
annotate src/os/win32/ngx_atomic.h @ 9208:2ed3f57dca0a
QUIC: fixed unsent MTU probe acknowledgement.
Previously if an MTU probe send failed early in ngx_quic_frame_sendto()
due to allocation error or congestion control, the application level packet
number was not increased, but was still saved as MTU probe packet number.
Later when a packet with this number was acknowledged, the unsent MTU probe
was acknowledged as well. This could result in discovering a bigger MTU than
supported by the path, which could lead to EMSGSIZE (Message too long) errors
while sending further packets.
The problem existed since PMTUD was introduced in 58afcd72446f (1.25.2).
Back then only the unlikely memory allocation error could trigger it. However
in efcdaa66df2e congestion control was added to ngx_quic_frame_sendto() which
can now trigger the issue with a higher probability.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Wed, 14 Feb 2024 16:56:28 +0400 |
parents | 2cd019520210 |
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rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #ifndef _NGX_ATOMIC_H_INCLUDED_ |
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9 #define _NGX_ATOMIC_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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16 #define NGX_HAVE_ATOMIC_OPS 1 |
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17 |
561 | 18 typedef int32_t ngx_atomic_int_t; |
19 typedef uint32_t ngx_atomic_uint_t; | |
497 | 20 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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21 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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24 #if defined( __WATCOMC__ ) || defined( __BORLANDC__ ) || defined(__GNUC__) \ |
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25 || ( _MSC_VER >= 1300 ) |
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27 /* the new SDK headers */ |
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29 #define ngx_atomic_cmp_set(lock, old, set) \ |
6474 | 30 ((ngx_atomic_uint_t) InterlockedCompareExchange((long *) lock, set, old) \ |
31 == old) | |
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33 #else |
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35 /* the old MS VC6.0SP2 SDK headers */ |
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37 #define ngx_atomic_cmp_set(lock, old, set) \ |
6474 | 38 (InterlockedCompareExchange((void **) lock, (void *) set, (void *) old) \ |
39 == (void *) old) | |
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41 #endif |
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561 | 44 #define ngx_atomic_fetch_add(p, add) InterlockedExchangeAdd((long *) p, add) |
45 | |
46 | |
563 | 47 #define ngx_memory_barrier() |
48 | |
49 | |
1193 | 50 #if defined( __BORLANDC__ ) || ( __WATCOMC__ < 1230 ) |
51 | |
52 /* | |
53 * Borland C++ 5.5 (tasm32) and Open Watcom C prior to 1.3 | |
54 * do not understand the "pause" instruction | |
55 */ | |
56 | |
611 | 57 #define ngx_cpu_pause() |
58 #else | |
59 #define ngx_cpu_pause() __asm { pause } | |
60 #endif | |
61 | |
62 | |
63 void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin); | |
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65 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
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66 #define ngx_unlock(lock) *(lock) = 0 |
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69 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |