annotate src/core/ngx_spinlock.c @ 78:9db7e0b5b27f NGINX_0_1_39

nginx 0.1.39 *) The changes in the ngx_http_charset_module: the "default_charset" directive was canceled; the "charset" directive sets the response charset; the "source_charset" directive sets the source charset only. *) Bugfix: the backend "WWW-Authenticate" header line did not transferred while the 401 response code redirecting. *) Bugfix: the ngx_http_proxy_module and ngx_http_fastcgi_module may close a connection before anything was transferred to a client; bug appeared in 0.1.38. *) Workaround: the Linux glibc crypt_r() initialization bug. *) Bugfix: the ngx_http_ssi_module did not support the relative URI in the "include virtual" command. *) Bugfix: if the backend response had the "Location" header line and nginx should not rewrite this line, then the 500 code response body was transferred; bug appeared in 0.1.29. *) Bugfix: some directives of the ngx_http_proxy_module and ngx_http_fastcgi_module were not inherited from the server to the location level; bug appeared in 0.1.29. *) Bugfix: the ngx_http_ssl_module did not support the certificate chain. *) Bugfix: the ngx_http_autoindex_module did not show correctly the long file names; bug appeared in 0.1.38. *) Bugfixes in IMAP/POP3 proxy in interaction with a backend at the login state.
author Igor Sysoev <http://sysoev.ru>
date Thu, 14 Jul 2005 00:00:00 +0400
parents 41ccba1aba45
children 408f195b3482
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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 ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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16 {
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18 #if (NGX_HAVE_ATOMIC_OPS)
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20 ngx_uint_t tries;
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22 tries = 0;
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24 for ( ;; ) {
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26 if (*lock) {
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27 if (ngx_ncpu > 1 && tries++ < spin) {
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28 continue;
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29 }
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31 ngx_sched_yield();
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33 tries = 0;
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35 } else {
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36 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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37 return;
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38 }
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39 }
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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 }