Mercurial > hg > nginx
annotate src/os/unix/ngx_gcc_atomic_amd64.h @ 8795:278ab0ed24f2 quic
HTTP/3: generate more H3_FRAME_UNEXPECTED.
As per quic-http-34, these are the cases when this error should be generated:
If an endpoint receives a second SETTINGS frame
on the control stream, the endpoint MUST respond with a connection
error of type H3_FRAME_UNEXPECTED
SETTINGS frames MUST NOT be sent on any stream other than the control
stream. If an endpoint receives a SETTINGS frame on a different
stream, the endpoint MUST respond with a connection error of type
H3_FRAME_UNEXPECTED.
A client MUST NOT send a PUSH_PROMISE frame. A server MUST treat the
receipt of a PUSH_PROMISE frame as a connection error of type
H3_FRAME_UNEXPECTED; see Section 8.
The MAX_PUSH_ID frame is always sent on the control stream. Receipt
of a MAX_PUSH_ID frame on any other stream MUST be treated as a
connection error of type H3_FRAME_UNEXPECTED.
Receipt of an invalid sequence of frames MUST be treated as a
connection error of type H3_FRAME_UNEXPECTED; see Section 8. In
particular, a DATA frame before any HEADERS frame, or a HEADERS or
DATA frame after the trailing HEADERS frame, is considered invalid.
A CANCEL_PUSH frame is sent on the control stream. Receiving a
CANCEL_PUSH frame on a stream other than the control stream MUST be
treated as a connection error of type H3_FRAME_UNEXPECTED.
The GOAWAY frame is always sent on the control stream.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Fri, 11 Jun 2021 12:11:08 +0300 |
parents | d620f497c50f |
children |
rev | line source |
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561 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
561 | 5 */ |
6 | |
7 | |
8 #if (NGX_SMP) | |
9 #define NGX_SMP_LOCK "lock;" | |
10 #else | |
11 #define NGX_SMP_LOCK | |
12 #endif | |
13 | |
14 | |
15 /* | |
16 * "cmpxchgq r, [m]": | |
17 * | |
18 * if (rax == [m]) { | |
19 * zf = 1; | |
20 * [m] = r; | |
21 * } else { | |
22 * zf = 0; | |
23 * rax = [m]; | |
24 * } | |
25 * | |
26 * | |
27 * The "r" is any register, %rax (%r0) - %r16. | |
1009 | 28 * The "=a" and "a" are the %rax register. |
29 * Although we can return result in any register, we use "a" because it is | |
30 * used in cmpxchgq anyway. The result is actually in %al but not in $rax, | |
31 * however as the code is inlined gcc can test %al as well as %rax. | |
32 * | |
561 | 33 * The "cc" means that flags were changed. |
34 */ | |
35 | |
36 static ngx_inline ngx_atomic_uint_t | |
37 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
38 ngx_atomic_uint_t set) | |
577 | 39 { |
1009 | 40 u_char res; |
561 | 41 |
42 __asm__ volatile ( | |
43 | |
44 NGX_SMP_LOCK | |
45 " cmpxchgq %3, %1; " | |
1009 | 46 " sete %0; " |
561 | 47 |
48 : "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory"); | |
49 | |
50 return res; | |
51 } | |
52 | |
53 | |
54 /* | |
55 * "xaddq r, [m]": | |
56 * | |
57 * temp = [m]; | |
58 * [m] += r; | |
59 * r = temp; | |
60 * | |
61 * | |
62 * The "+r" is any register, %rax (%r0) - %r16. | |
63 * The "cc" means that flags were changed. | |
64 */ | |
65 | |
66 static ngx_inline ngx_atomic_int_t | |
67 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
68 { | |
69 __asm__ volatile ( | |
70 | |
71 NGX_SMP_LOCK | |
72 " xaddq %0, %1; " | |
73 | |
1007 | 74 : "+r" (add) : "m" (*value) : "cc", "memory"); |
561 | 75 |
76 return add; | |
77 } | |
563 | 78 |
79 | |
611 | 80 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") |
81 | |
82 #define ngx_cpu_pause() __asm__ ("pause") |