Mercurial > hg > nginx
annotate src/core/ngx_spinlock.c @ 435:5cdc4838d4e8
nginx-0.0.11-2004-09-22-20:18:21 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 22 Sep 2004 16:18:21 +0000 |
parents | 018569a8f09c |
children | da8c5707af39 |
rev | line source |
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1 |
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2 #include <ngx_config.h> |
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3 #include <ngx_core.h> |
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6 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) |
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7 { |
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9 #if (NGX_HAVE_ATOMIC_OPS) |
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11 ngx_uint_t tries; |
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13 tries = 0; |
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14 |
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15 for ( ;; ) { |
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16 |
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17 if (*lock) { |
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18 if (ngx_ncpu > 1 && tries++ < spin) { |
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19 continue; |
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20 } |
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22 ngx_sched_yield(); |
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23 |
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24 tries = 0; |
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25 |
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26 } else { |
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27 if (ngx_atomic_cmp_set(lock, 0, 1)) { |
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28 return; |
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29 } |
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30 } |
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31 } |
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32 |
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33 #else |
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34 |
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35 #if (NGX_THREADS) |
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36 |
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37 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! |
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38 |
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39 #endif |
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40 |
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41 #endif |
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42 |
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43 } |