Mercurial > hg > nginx-mail
view src/core/ngx_spinlock.c @ 575:f7ec98e3caeb NGINX_0_8_18
nginx 0.8.18
*) Feature: the "read_ahead" directive.
*) Feature: now several "perl_modules" directive may be used.
*) Feature: the "limit_req_log_level" and "limit_conn_log_level"
directives.
*) Bugfix: now "limit_req" directive conforms to the leaky bucket
algorithm.
Thanks to Maxim Dounin.
*) Bugfix: nginx did not work on Linux/sparc.
Thanks to Marcus Ramberg.
*) Bugfix: nginx sent '\0' in a "Location" response header line on
MKCOL request.
Thanks to Xie Zhenye.
*) Bugfix: zero status code was logged instead of 499 status code; the
bug had appeared in 0.8.11.
*) Bugfix: socket leak; the bug had appeared in 0.8.11.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Tue, 06 Oct 2009 00:00:00 +0400 |
parents | 73e8476f9142 |
children |
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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 }