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annotate src/core/ngx_spinlock.c @ 493:975f62e77f02 release-0.1.21

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nginx-0.1.21-RELEASE import *) Bugfix: the ngx_http_stub_status_module showed incorrect statistics if "rtsig" method was used or if several worker process ran on SMP. *) Bugfix: nginx could not be built by the icc compiler on Linux or if the zlib-1.2.x library was building from sources. *) Bugfix: nginx could not be built on NetBSD 2.0.
author Igor Sysoev <igor@sysoev.ru>
date Tue, 22 Feb 2005 14:40:13 +0000
parents 42d11f017717
children 9c2f3ed7a247
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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 */
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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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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
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13 */
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018569a8f09c nginx-0.0.7-2004-06-30-19:30:41 import
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15 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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16 {
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5cdc4838d4e8 nginx-0.0.11-2004-09-22-20:18:21 import
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18 #if (NGX_HAVE_ATOMIC_OPS)
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20 ngx_uint_t tries;
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22 tries = 0;
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f2755a2885c8 nginx-0.0.7-2004-06-21-23:22:53 import
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24 for ( ;; ) {
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26 if (*lock) {
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27 if (ngx_ncpu > 1 && tries++ < spin) {
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28 continue;
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29 }
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31 ngx_sched_yield();
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33 tries = 0;
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35 } else {
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36 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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37 return;
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38 }
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39 }
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40 }
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41
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42 #else
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5cdc4838d4e8 nginx-0.0.11-2004-09-22-20:18:21 import
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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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49
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50 #endif
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51
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52 }