Mercurial > hg > nginx-quic
view src/core/ngx_spinlock.c @ 607:77cdfe394a94 release-0.3.25
nginx-0.3.25-RELEASE import
*) Bugfix: the segmentation fault was occurred on start or while
reconfiguration if there was invalid configuration; the bug had
appeared in 0.3.24.
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 01 Feb 2006 20:01:51 +0000 |
parents | 9c2f3ed7a247 |
children | 3f8a2132b93d |
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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 }