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annotate src/core/ngx_spinlock.c @ 158:2d15b82126ed NGINX_0_3_26

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nginx 0.3.26 *) Change: the "optimize_host_names" directive was renamed to the "optimize_server_names". *) Bugfix: if in the "proxy_pass" directive was no the URI part, then the main request URI was transferred to a backend while proxying the SSI subrequest.
author Igor Sysoev <http://sysoev.ru>
date Fri, 03 Feb 2006 00:00:00 +0300
parents 408f195b3482
children 73e8476f9142
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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 /*
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12 * TODO: the P4 optimized assembler version with the "pause" operation
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13 */
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15 void
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16 ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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17 {
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19 #if (NGX_HAVE_ATOMIC_OPS)
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21 ngx_uint_t tries;
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23 tries = 0;
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25 for ( ;; ) {
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27 if (*lock) {
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28 if (ngx_ncpu > 1 && tries++ < spin) {
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29 continue;
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30 }
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32 ngx_sched_yield();
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34 tries = 0;
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36 } else {
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37 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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38 return;
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39 }
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40 }
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41 }
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43 #else
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44
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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 }