annotate src/core/ngx_spinlock.c @ 130:82d695e3d662 NGINX_0_3_12

nginx 0.3.12 *) Security: if nginx was built with the ngx_http_realip_module and the "satisfy_any on" directive was used, then access and authorization directives did not work. The ngx_http_realip_module was not built and is not built by default. *) Change: the "$time_gmt" variable name was changed to "$time_local". *) Change: the "proxy_header_buffer_size" and "fastcgi_header_buffer_size" directives was renamed to the "proxy_buffer_size" and "fastcgi_buffer_size" directives. *) Feature: the ngx_http_memcached_module. *) Feature: the "proxy_buffering" directive. *) Bugfix: the changes in accept mutex handling when the "rtsig" method was used; bug appeared in 0.3.0. *) Bugfix: if the client sent the "Transfer-Encoding: chunked" header line, then nginx returns the 411 error. *) Bugfix: if the "auth_basic" directive was inherited from the http level, then the realm in the "WWW-Authenticate" header line was without the "Basic realm" text. *) Bugfix: if the "combined" format was explicitly specified in the "access_log" directive, then the empty lines was written to the log; bug appeared in 0.3.8. *) Bugfix: nginx did not run on the sparc platform under any OS except Solaris. *) Bugfix: now it is not necessary to place space between the quoted string and closing bracket in the "if" directive.
author Igor Sysoev <http://sysoev.ru>
date Sat, 26 Nov 2005 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 }