Mercurial > hg > nginx-vendor-current
view src/core/ngx_spinlock.c @ 690:b5b7eea22fda NGINX_1_3_8
nginx 1.3.8
*) Feature: the "optional_no_ca" parameter of the "ssl_verify_client"
directive.
Thanks to Mike Kazantsev and Eric O'Connor.
*) Feature: the $bytes_sent, $connection, and $connection_requests
variables can now be used not only in the "log_format" directive.
Thanks to Benjamin Grössing.
*) Feature: the "auto" parameter of the "worker_processes" directive.
*) Bugfix: "cache file ... has md5 collision" alert.
*) Bugfix: in the ngx_http_gunzip_filter_module.
*) Bugfix: in the "ssl_stapling" directive.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Tue, 30 Oct 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 }