Mercurial > hg > nginx-vendor-current

annotate src/core/ngx_spinlock.c @ 680:597573166f34 NGINX_1_3_3

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nginx 1.3.3 *) Feature: entity tags support and the "etag" directive. *) Bugfix: trailing dot in a source value was not ignored if the "map" directive was used with the "hostnames" parameter. *) Bugfix: incorrect location might be used to process a request if a URI was changed via a "rewrite" directive before an internal redirect to a named location.
author Igor Sysoev <http://sysoev.ru>
date Tue, 10 Jul 2012 00:00:00 +0400
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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12 void
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13 ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin)
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14 {
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16 #if (NGX_HAVE_ATOMIC_OPS)
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18 ngx_uint_t i, n;
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20 for ( ;; ) {
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22 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) {
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23 return;
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24 }
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26 if (ngx_ncpu > 1) {
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28 for (n = 1; n < spin; n <<= 1) {
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30 for (i = 0; i < n; i++) {
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31 ngx_cpu_pause();
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32 }
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34 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) {
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35 return;
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36 }
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37 }
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38 }
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40 ngx_sched_yield();
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41 }
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43 #else
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45 #if (NGX_THREADS)
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47 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !
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49 #endif
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51 #endif
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53 }