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annotate src/core/ngx_spinlock.c @ 591:8c0cdd81580e release-0.3.17

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nginx-0.3.17-RELEASE import *) Change: now on Linux configure checks the presence of epoll and sendfile64() in kernel. *) Feature: the "map" directive supports domain names in the ".domain.tld" form. *) Bugfix: the timeouts were not used in SSL handshake; the bug had appeared in 0.2.4. *) Bugfix: in the HTTPS protocol in the "proxy_pass" directive. *) Bugfix: when the HTTPS protocol was used in the "proxy_pass" directive the port 80 was used by default.
author Igor Sysoev <igor@sysoev.ru>
date Sun, 18 Dec 2005 16:02:44 +0000
parents 9c2f3ed7a247
children 3f8a2132b93d
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
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3 * Copyright (C) Igor Sysoev
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4 */
da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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975f62e77f02 nginx-0.1.21-RELEASE import
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11 /*
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12 * TODO: the P4 optimized assembler version with the "pause" operation
975f62e77f02 nginx-0.1.21-RELEASE import
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13 */
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9c2f3ed7a247 nginx-0.3.3-RELEASE import
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15 void
9c2f3ed7a247 nginx-0.3.3-RELEASE import
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16 ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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17 {
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5cdc4838d4e8 nginx-0.0.11-2004-09-22-20:18:21 import
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5cdc4838d4e8 nginx-0.0.11-2004-09-22-20:18:21 import
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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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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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25 for ( ;; ) {
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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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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5cdc4838d4e8 nginx-0.0.11-2004-09-22-20:18:21 import
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43 #else
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5cdc4838d4e8 nginx-0.0.11-2004-09-22-20:18:21 import
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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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52
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53 }