Mercurial > hg > nginx
view src/core/ngx_spinlock.c @ 447:288f249897e7
nginx-0.1.0-2004-09-30-23:44:38 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 30 Sep 2004 19:44:38 +0000 |
parents | 42d11f017717 |
children | 975f62e77f02 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> 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 }