Mercurial > hg > nginx-vendor-0-8
annotate src/core/ngx_spinlock.c @ 554:5c576ea5dbd9 NGINX_0_8_29
nginx 0.8.29
*) Change: now the "009" status code is written to an access log for
proxied HTTP/0.9 responses.
*) Feature: the "addition_types", "charset_types", "gzip_types",
"ssi_types", "sub_filter_types", and "xslt_types" directives support
an "*" parameter.
*) Feature: GCC 4.1+ built-in atomic operations usage.
Thanks to W-Mark Kubacki.
*) Feature: the --with-libatomic[=DIR] option in the configure.
Thanks to W-Mark Kubacki.
*) Bugfix: listen unix domain socket had limited access rights.
*) Bugfix: cached HTTP/0.9 responses were handled incorrectly.
*) Bugfix: regular expression named captures given by "?P<...>" did not
work in a "server_name" directive.
Thanks to Maxim Dounin.
| author | Igor Sysoev <http://sysoev.ru> |
|---|---|
| date | Mon, 30 Nov 2009 00:00:00 +0300 |
| parents | 73e8476f9142 |
| children |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 | |
| 10 | |
| 112 | 11 void |
| 160 | 12 ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin) |
| 0 | 13 { |
| 14 | |
| 15 #if (NGX_HAVE_ATOMIC_OPS) | |
| 16 | |
| 160 | 17 ngx_uint_t i, n; |
| 0 | 18 |
| 19 for ( ;; ) { | |
| 20 | |
| 160 | 21 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
| 22 return; | |
| 23 } | |
| 24 | |
| 25 if (ngx_ncpu > 1) { | |
| 26 | |
| 27 for (n = 1; n < spin; n <<= 1) { | |
| 0 | 28 |
| 160 | 29 for (i = 0; i < n; i++) { |
| 30 ngx_cpu_pause(); | |
| 31 } | |
| 0 | 32 |
| 160 | 33 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
| 34 return; | |
| 35 } | |
| 0 | 36 } |
| 37 } | |
| 160 | 38 |
| 39 ngx_sched_yield(); | |
| 0 | 40 } |
| 41 | |
| 42 #else | |
| 43 | |
| 44 #if (NGX_THREADS) | |
| 45 | |
| 46 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! | |
| 47 | |
| 48 #endif | |
| 49 | |
| 50 #endif | |
| 51 | |
| 52 } |