Mercurial > hg > nginx-vendor-current
view src/core/ngx_spinlock.c @ 546:e19e5f542878 NGINX_0_8_25
nginx 0.8.25
*) Change: now no message is written in an error log if a variable is
not found by $r->variable() method.
*) Feature: the ngx_http_degradation_module.
*) Feature: regular expression named captures.
*) Feature: now URI part is not required a "proxy_pass" directive if
variables are used.
*) Feature: now the "msie_padding" directive works for Chrome too.
*) Bugfix: a segmentation fault occurred in a worker process on low
memory condition; the bug had appeared in 0.8.18.
*) Bugfix: nginx sent gzipped responses to clients those do not support
gzip, if "gzip_static on" and "gzip_vary off"; the bug had appeared
in 0.8.16.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Mon, 16 Nov 2009 00:00:00 +0300 |
parents | 73e8476f9142 |
children | d0f7a625f27c |
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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 }