Mercurial > hg > nginx-vendor-current
view src/core/ngx_spinlock.c @ 448:76a79816b771 NGINX_0_7_36
nginx 0.7.36
*) Feature: a preliminary IPv6 support; the "listen" directive of the
HTTP module supports IPv6.
*) Bugfix: the $ancient_browser variable did not work for browsers
preset by a "modern_browser" directives.
author | Igor Sysoev <http://sysoev.ru> |
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date | Sat, 21 Feb 2009 00:00:00 +0300 |
parents | 73e8476f9142 |
children | d0f7a625f27c |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin) { #if (NGX_HAVE_ATOMIC_OPS) ngx_uint_t i, n; for ( ;; ) { if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { return; } if (ngx_ncpu > 1) { for (n = 1; n < spin; n <<= 1) { for (i = 0; i < n; i++) { ngx_cpu_pause(); } if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { return; } } } ngx_sched_yield(); } #else #if (NGX_THREADS) #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! #endif #endif }