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annotate src/core/ngx_spinlock.c @ 373:018569a8f09c

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nginx-0.0.7-2004-06-30-19:30:41 import
author Igor Sysoev <igor@sysoev.ru>
date Wed, 30 Jun 2004 15:30:41 +0000
parents src/event/ngx_event_spinlock.c@f2755a2885c8
children 5cdc4838d4e8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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1
018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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2 #include <ngx_config.h>
018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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3 #include <ngx_core.h>
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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6 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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7 {
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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8 ngx_uint_t tries;
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10 tries = 0;
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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12 for ( ;; ) {
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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14 if (*lock) {
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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15 if (ngx_ncpu > 1 && tries++ < spin) {
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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16 continue;
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17 }
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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18
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19 ngx_sched_yield();
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20
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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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 }
f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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29 }