annotate src/core/ngx_spinlock.c @ 36:a39d1b793287 NGINX_0_1_18

nginx 0.1.18 *) Workaround: the default values of the devpoll_events and the devpoll_changes directives changed from 512 to 32 to be compatible with Solaris 10. *) Bugfix: the proxy_set_x_var and fastcgi_set_var directives were not inherited. *) Bugfix: in the redirect rewrite directive the arguments were concatenated with URI by the "&" rather than the "?". *) Bugfix: the lines without trailing ";" in the file being included by the ngx_http_geo_module were silently ignored. *) Feature: the ngx_http_stub_status_module. *) Bugfix: the unknown log format in the access_log directive caused the segmentation fault. *) Feature: the new "document_root" parameter of the fastcgi_params directive. *) Feature: the fastcgi_redirect_errors directive. *) Feature: the new "break" modifier of the "rewrite" directive allows to stop the rewrite/location cycle and sets the current configuration to the request.
author Igor Sysoev <http://sysoev.ru>
date Wed, 09 Feb 2005 00:00:00 +0300
parents f0b350454894
children 41ccba1aba45
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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 ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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12 {
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14 #if (NGX_HAVE_ATOMIC_OPS)
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16 ngx_uint_t tries;
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18 tries = 0;
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20 for ( ;; ) {
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21
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22 if (*lock) {
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23 if (ngx_ncpu > 1 && tries++ < spin) {
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24 continue;
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25 }
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27 ngx_sched_yield();
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29 tries = 0;
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31 } else {
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32 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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33 return;
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34 }
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35 }
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36 }
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38 #else
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39
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40 #if (NGX_THREADS)
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42 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !
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43
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44 #endif
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46 #endif
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48 }