Mercurial > hg > nginx-vendor-0-7
view src/core/ngx_spinlock.c @ 134:1898c6d03d90 NGINX_0_3_14
nginx 0.3.14
*) Bugfix: in the 304 response the body was transferred; bug appeared
in 0.3.13.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Mon, 05 Dec 2005 00:00:00 +0300 |
parents | 408f195b3482 |
children | 73e8476f9142 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> /* * TODO: the P4 optimized assembler version with the "pause" operation */ void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) { #if (NGX_HAVE_ATOMIC_OPS) ngx_uint_t tries; tries = 0; for ( ;; ) { if (*lock) { if (ngx_ncpu > 1 && tries++ < spin) { continue; } ngx_sched_yield(); tries = 0; } else { if (ngx_atomic_cmp_set(lock, 0, 1)) { return; } } } #else #if (NGX_THREADS) #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! #endif #endif }