Mercurial > hg > nginx-quic
annotate src/core/ngx_crc32.c @ 4311:45272aab5eea
Unlock of shared memory zones on process crash.
If process exited abnormally while holding lock on some shared memory zone -
unlock it. It may be not safe thing to do (as crash with lock held may
result in corrupted shared memory structure, and other processes will
subsequently crash while trying to access shared data), therefore complain
loudly if unlock succeeds.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 23 Nov 2011 14:09:19 +0000 |
parents | 8c696afe46b3 |
children | d620f497c50f |
rev | line source |
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790 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 /* | |
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12 * The code and lookup tables are based on the algorithm |
790 | 13 * described at http://www.w3.org/TR/PNG/ |
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14 * |
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15 * The 256 element lookup table takes 1024 bytes, and it may be completely |
1021 | 16 * cached after processing about 30-60 bytes of data. So for short data |
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17 * we use the 16 element lookup table that takes only 64 bytes and align it |
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18 * to CPU cache line size. Of course, the small table adds code inside |
1021 | 19 * CRC32 loop, but the cache misses overhead is bigger than overhead of |
20 * the additional code. For example, ngx_crc32_short() of 16 bytes of data | |
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21 * takes half as much CPU clocks than ngx_crc32_long(). |
790 | 22 */ |
23 | |
24 | |
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25 static uint32_t ngx_crc32_table16[] = { |
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26 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, |
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27 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, |
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28 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, |
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29 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c |
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30 }; |
790 | 31 |
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32 |
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33 uint32_t ngx_crc32_table256[] = { |
790 | 34 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, |
35 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, | |
36 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, | |
37 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, | |
38 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
39 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, | |
40 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, | |
41 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, | |
42 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, | |
43 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
44 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, | |
45 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, | |
46 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, | |
47 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, | |
48 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
49 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, | |
50 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, | |
51 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, | |
52 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, | |
53 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
54 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, | |
55 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, | |
56 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, | |
57 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, | |
58 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
59 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, | |
60 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, | |
61 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, | |
62 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, | |
63 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
64 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, | |
65 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, | |
66 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, | |
67 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, | |
68 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
69 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, | |
70 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, | |
71 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, | |
72 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, | |
73 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
74 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, | |
75 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, | |
76 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, | |
77 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, | |
78 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
79 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, | |
80 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, | |
81 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, | |
82 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, | |
83 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
84 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, | |
85 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, | |
86 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, | |
87 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, | |
88 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
89 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, | |
90 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, | |
91 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, | |
92 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, | |
93 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
94 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, | |
95 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, | |
96 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, | |
97 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d | |
98 }; | |
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99 |
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100 |
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101 uint32_t *ngx_crc32_table_short = ngx_crc32_table16; |
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102 |
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103 |
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104 ngx_int_t |
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105 ngx_crc32_table_init(void) |
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106 { |
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107 void *p; |
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108 |
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109 if (((uintptr_t) ngx_crc32_table_short |
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110 & ~((uintptr_t) ngx_cacheline_size - 1)) |
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111 == (uintptr_t) ngx_crc32_table_short) |
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112 { |
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113 return NGX_OK; |
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114 } |
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115 |
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116 p = ngx_alloc(16 * sizeof(uint32_t) + ngx_cacheline_size, ngx_cycle->log); |
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117 if (p == NULL) { |
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118 return NGX_ERROR; |
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119 } |
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120 |
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121 p = ngx_align_ptr(p, ngx_cacheline_size); |
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122 |
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123 ngx_memcpy(p, ngx_crc32_table16, 16 * sizeof(uint32_t)); |
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124 |
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125 ngx_crc32_table_short = p; |
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126 |
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127 return NGX_OK; |
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128 } |