annotate src/core/ngx_spinlock.c @ 142:84910468f6de NGINX_0_3_18

nginx 0.3.18 *) Feature: the "server_names" directive supports the ".domain.tld" names. *) Feature: the "server_names" directive uses the hash for the "*.domain.tld" names and more effective hash for usual names. *) Change: the "server_names_hash_max_size" and "server_names_hash_bucket_size" directives. *) Change: the "server_names_hash" and "server_names_hash_threshold" directives were canceled. *) Feature: the "valid_referers" directive uses the hash site names. *) Change: now the "valid_referers" directive checks the site names only without the URI part. *) Bugfix: some ".domain.tld" names incorrectly processed by the ngx_http_map_module. *) Bugfix: segmentation fault was occurred if configuration file did not exist; bug appeared in 0.3.12. *) Bugfix: on 64-bit platforms segmentation fault may occurred on start; bug appeared in 0.3.16.
author Igor Sysoev <http://sysoev.ru>
date Mon, 26 Dec 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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408f195b3482 nginx 0.3.3
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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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46
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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 }