annotate src/core/ngx_spinlock.c @ 358:9121a0a91f47 NGINX_0_6_23

nginx 0.6.23 *) Change: the "off" parameter in the "ssl_session_cache" directive; now this is default parameter. *) Change: the "open_file_cache_retest" directive was renamed to the "open_file_cache_valid". *) Feature: the "open_file_cache_min_uses" directive. *) Feature: the ngx_http_gzip_static_module. *) Feature: the "gzip_disable" directive. *) Feature: the "memcached_pass" directive may be used inside the "if" block. *) Bugfix: a segmentation fault occurred in worker process, if the "memcached_pass" and "if" directives were used in the same location. *) Bugfix: if a "satisfy_any on" directive was used and not all access and auth modules directives were set, then other given access and auth directives were not tested; *) Bugfix: regex parameters in a "valid_referers" directive were not inherited from previous level. *) Bugfix: a "post_action" directive did run if a request was completed with 499 status code. *) Bugfix: optimization of 16K buffer usage in a SSL connection. Thanks to Ben Maurer. *) Bugfix: the STARTTLS in SMTP mode did not work. Thanks to Oleg Motienko. *) Bugfix: in HTTPS mode requests might fail with the "bad write retry" error; bug appeared in 0.5.13.
author Igor Sysoev <http://sysoev.ru>
date Thu, 27 Dec 2007 00:00:00 +0300
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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 }