Mercurial > hg > nginx
annotate src/core/ngx_spinlock.c @ 373:018569a8f09c
nginx-0.0.7-2004-06-30-19:30:41 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 30 Jun 2004 15:30:41 +0000 |
parents | src/event/ngx_event_spinlock.c@f2755a2885c8 |
children | 5cdc4838d4e8 |
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373
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nginx-0.0.7-2004-06-30-19:30:41 import
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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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4 |
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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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8 ngx_uint_t tries; |
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9 |
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10 tries = 0; |
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11 |
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12 for ( ;; ) { |
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13 |
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14 if (*lock) { |
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15 if (ngx_ncpu > 1 && tries++ < spin) { |
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16 continue; |
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17 } |
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18 |
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19 ngx_sched_yield(); |
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20 |
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21 tries = 0; |
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22 |
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23 } else { |
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24 if (ngx_atomic_cmp_set(lock, 0, 1)) { |
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25 return; |
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26 } |
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27 } |
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28 } |
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29 } |