Mercurial > hg > nginx-ranges
view src/core/ngx_spinlock.c @ 266:251bcd11a5b8 NGINX_0_5_3
nginx 0.5.3
*) Feature: the ngx_http_perl_module supports the $r->status,
$r->log_error, and $r->sleep methods.
*) Feature: the $r->variable method supports variables that do not
exist in nginx configuration.
*) Bugfix: the $r->has_request_body method did not work.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Wed, 13 Dec 2006 00:00:00 +0300 |
parents | 73e8476f9142 |
children |
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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 }