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annotate src/core/ngx_spinlock.c @ 435:5cdc4838d4e8

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nginx-0.0.11-2004-09-22-20:18:21 import
author Igor Sysoev <igor@sysoev.ru>
date Wed, 22 Sep 2004 16:18:21 +0000
parents 018569a8f09c
children da8c5707af39
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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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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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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15 for ( ;; ) {
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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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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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33 #else
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35 #if (NGX_THREADS)
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37 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !
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39 #endif
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41 #endif
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42
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43 }