Mercurial > hg > nginx
annotate src/core/ngx_crc.h @ 4309:3f6040cd731e
Added shmtx interface to forcibly unlock mutexes.
It is currently used from master process on abnormal worker termination to
unlock accept mutex (unlocking of accept mutex was broken in 1.0.2). It is
expected to be used in the future to unlock other mutexes as well.
Shared mutex code was rewritten to make this possible in a safe way, i.e.
with a check if lock was actually held by the exited process. We again use
pid to lock mutex, and use separate atomic variable for a count of processes
waiting in sem_wait().
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 23 Nov 2011 13:55:38 +0000 |
parents | 99858705b03f |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #ifndef _NGX_CRC_H_INCLUDED_ |
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8 #define _NGX_CRC_H_INCLUDED_ |
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792 | 11 #include <ngx_config.h> |
12 #include <ngx_core.h> | |
13 | |
14 | |
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15 /* 32-bit crc16 */ |
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16 |
776 | 17 static ngx_inline uint32_t |
789 | 18 ngx_crc(u_char *data, size_t len) |
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19 { |
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20 uint32_t sum; |
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22 for (sum = 0; len; len--) { |
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24 /* |
776 | 25 * gcc 2.95.2 x86 and icc 7.1.006 compile |
26 * that operator into the single "rol" opcode, | |
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27 * msvc 6.0sp2 compiles it into four opcodes. |
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28 */ |
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29 sum = sum >> 1 | sum << 31; |
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31 sum += *data++; |
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32 } |
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34 return sum; |
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35 } |
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37 |
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38 #endif /* _NGX_CRC_H_INCLUDED_ */ |