annotate src/core/ngx_spinlock.c @ 22:8b6db3bda591 NGINX_0_1_11

nginx 0.1.11 *) Feature: the worker_priority directive. *) Change: both tcp_nopush and tcp_nodelay directives affect the transferred response. *) Bugfix: nginx did not call initgroups(). Thanks to Andrew Sitnikov and Andrei Nigmatulin. *) Change: now the ngx_http_autoindex_module shows the file size in the bytes. *) Bugfix: the ngx_http_autoindex_module returned the 500 error if the broken symlink was in a directory. *) Bugfix: the files bigger than 4G could not be transferred using sendfile. *) Bugfix: if the backend was resolved to several backends and there was an error while the response waiting then process may got caught in an endless loop. *) Bugfix: the worker process may exit with the "unknown cycle" message when the /dev/poll method was used. *) Bugfix: "close() channel failed" errors. *) Bugfix: the autodetection of the "nobody" and "nogroup" groups. *) Bugfix: the send_lowat directive did not work on Linux. *) Bugfix: the segmentation fault occurred if there was no events section in configuration. *) Bugfix: nginx could not be built on OpenBSD. *) Bugfix: the double slashes in "://" in the URI were converted to ":/".
author Igor Sysoev <http://sysoev.ru>
date Thu, 02 Dec 2004 00:00:00 +0300
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children 41ccba1aba45
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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 ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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12 {
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14 #if (NGX_HAVE_ATOMIC_OPS)
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16 ngx_uint_t tries;
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18 tries = 0;
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20 for ( ;; ) {
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21
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22 if (*lock) {
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23 if (ngx_ncpu > 1 && tries++ < spin) {
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24 continue;
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25 }
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27 ngx_sched_yield();
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29 tries = 0;
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31 } else {
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32 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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33 return;
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34 }
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35 }
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36 }
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38 #else
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39
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40 #if (NGX_THREADS)
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42 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !
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43
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44 #endif
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46 #endif
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48 }