Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.c @ 8456:c72d8839f427
Mail: fixed SMTP pipelining to send the response immediately.
Previously, if there were some pipelined SMTP data in the buffer when
a proxied connection with the backend was established, nginx called
ngx_mail_proxy_handler() to send these data, and not tried to send the
response to the last command. In most cases, this response was later sent
along with the response to the pipelined command, but if for some reason
client decides to wait for the response before finishing the next command
this might result in a connection hang.
Fix is to always call ngx_mail_proxy_handler() to send the response, and
additionally post an event to send the pipelined data if needed.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 19 May 2021 03:13:12 +0300 |
parents | d620f497c50f |
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rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
790 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
12 /* | |
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13 * The code and lookup tables are based on the algorithm |
790 | 14 * described at http://www.w3.org/TR/PNG/ |
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15 * |
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16 * The 256 element lookup table takes 1024 bytes, and it may be completely |
1021 | 17 * cached after processing about 30-60 bytes of data. So for short data |
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18 * we use the 16 element lookup table that takes only 64 bytes and align it |
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19 * to CPU cache line size. Of course, the small table adds code inside |
1021 | 20 * CRC32 loop, but the cache misses overhead is bigger than overhead of |
21 * the additional code. For example, ngx_crc32_short() of 16 bytes of data | |
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22 * takes half as much CPU clocks than ngx_crc32_long(). |
790 | 23 */ |
24 | |
25 | |
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26 static uint32_t ngx_crc32_table16[] = { |
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27 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
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28 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
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29 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
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30 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
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31 }; |
790 | 32 |
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33 |
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34 uint32_t ngx_crc32_table256[] = { |
790 | 35 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
36 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, | |
37 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, | |
38 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, | |
39 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
40 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, | |
41 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, | |
42 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, | |
43 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, | |
44 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
45 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, | |
46 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, | |
47 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, | |
48 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, | |
49 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
50 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, | |
51 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, | |
52 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, | |
53 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, | |
54 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
55 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, | |
56 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, | |
57 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, | |
58 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, | |
59 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
60 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, | |
61 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, | |
62 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, | |
63 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, | |
64 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
65 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, | |
66 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, | |
67 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, | |
68 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, | |
69 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
70 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, | |
71 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, | |
72 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, | |
73 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, | |
74 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
75 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, | |
76 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, | |
77 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, | |
78 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, | |
79 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
80 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, | |
81 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, | |
82 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, | |
83 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, | |
84 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
85 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, | |
86 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, | |
87 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, | |
88 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, | |
89 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
90 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, | |
91 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, | |
92 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, | |
93 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, | |
94 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
95 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, | |
96 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, | |
97 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, | |
98 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d | |
99 }; | |
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100 |
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101 |
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102 uint32_t *ngx_crc32_table_short = ngx_crc32_table16; |
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103 |
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104 |
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105 ngx_int_t |
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106 ngx_crc32_table_init(void) |
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107 { |
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108 void *p; |
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109 |
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110 if (((uintptr_t) ngx_crc32_table_short |
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111 & ~((uintptr_t) ngx_cacheline_size - 1)) |
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112 == (uintptr_t) ngx_crc32_table_short) |
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113 { |
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114 return NGX_OK; |
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115 } |
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116 |
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117 p = ngx_alloc(16 * sizeof(uint32_t) + ngx_cacheline_size, ngx_cycle->log); |
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118 if (p == NULL) { |
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119 return NGX_ERROR; |
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120 } |
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121 |
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122 p = ngx_align_ptr(p, ngx_cacheline_size); |
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123 |
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124 ngx_memcpy(p, ngx_crc32_table16, 16 * sizeof(uint32_t)); |
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125 |
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126 ngx_crc32_table_short = p; |
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127 |
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128 return NGX_OK; |
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129 } |