Mercurial > hg > nginx-vendor-current

annotate src/core/ngx_spinlock.c @ 638:f5a8cf31a203 NGINX_1_1_3

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nginx 1.1.3 *) Feature: the module ngx_http_mp4_module. *) Bugfix: in Linux AIO combined with open_file_cache. *) Bugfix: open_file_cache did not update file info on retest if file was not atomically changed. *) Bugfix: nginx could not be built on MacOSX 10.7.
author Igor Sysoev <http://sysoev.ru>
date Wed, 14 Sep 2011 00:00:00 +0400
parents 73e8476f9142
children d0f7a625f27c
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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11 void
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12 ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin)
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13 {
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15 #if (NGX_HAVE_ATOMIC_OPS)
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17 ngx_uint_t i, n;
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19 for ( ;; ) {
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21 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) {
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22 return;
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23 }
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25 if (ngx_ncpu > 1) {
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27 for (n = 1; n < spin; n <<= 1) {
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29 for (i = 0; i < n; i++) {
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30 ngx_cpu_pause();
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31 }
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33 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) {
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34 return;
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35 }
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36 }
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37 }
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39 ngx_sched_yield();
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40 }
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42 #else
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44 #if (NGX_THREADS)
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46 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !
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48 #endif
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50 #endif
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52 }