Mercurial > hg > nginx-vendor-current
view src/core/ngx_spinlock.c @ 672:f41d4b305d22 NGINX_1_2_0
nginx 1.2.0
*) Bugfix: a segmentation fault might occur in a worker process if the
"try_files" directive was used; the bug had appeared in 1.1.19.
*) Bugfix: response might be truncated if there were more than IOV_MAX
buffers used.
*) Bugfix: in the "crop" parameter of the "image_filter" directive.
Thanks to Maxim Bublis.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Mon, 23 Apr 2012 00:00:00 +0400 |
parents | d0f7a625f27c |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #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 }