annotate src/core/ngx_spinlock.c @ 262:e0b1d0a6c629 NGINX_0_5_1

nginx 0.5.1 *) Bugfix: the "post_action" directive might not run after a unsuccessful completion of a request. *) Workaround: for Eudora for Mac; bug appeared in 0.4.11. Thanks to Bron Gondwana. *) Bugfix: if the "upstream" name was used in the "fastcgi_pass", then the message "no port in upstream" was issued; bug appeared in 0.5.0. *) Bugfix: if the "proxy_pass" and "fastcgi_pass" directives used the same servers but different ports, then these directives uses the first described port; bug appeared in 0.5.0. *) Bugfix: if the "proxy_pass" and "fastcgi_pass" directives used the unix domain sockets, then these directives used first described socket; bug appeared in 0.5.0. *) Bugfix: ngx_http_auth_basic_module ignored the user if it was in the last line in the password file and there was no the carriage return, the line feed, or the ":" symbol after the password. *) Bugfix: the $upstream_response_time variable might be equal to "0.000", although response time was more than 1 millisecond.
author Igor Sysoev <http://sysoev.ru>
date Mon, 11 Dec 2006 00:00:00 +0300
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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43
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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 }