Mercurial > hg > nginx-vendor-current
annotate src/core/ngx_spinlock.c @ 626:a7a5fa2e395b NGINX_1_0_3
nginx 1.0.3
*) Feature: the "auth_basic_user_file" directive supports "$apr1",
"{PLAIN}", and "{SSHA}" password encryption methods.
Thanks to Maxim Dounin.
*) Feature: the "geoip_org" directive and $geoip_org variable.
Thanks to Alexander Uskov, Arnaud Granal, and Denis F. Latypoff.
*) Feature: ngx_http_geo_module and ngx_http_geoip_module support IPv4
addresses mapped to IPv6 addresses.
*) Bugfix: a segmentation fault occurred in a worker process during
testing IPv4 address mapped to IPv6 address, if access or deny rules
were defined only for IPv6; the bug had appeared in 0.8.22.
*) Bugfix: a cached reponse may be broken if proxy/fastcgi/scgi/
uwsgi_cache_bypass and proxy/fastcgi/scgi/uwsgi_no_cache directive
values were different; the bug had appeared in 0.8.46.
| author | Igor Sysoev <http://sysoev.ru> |
|---|---|
| date | Wed, 25 May 2011 00:00:00 +0400 |
| parents | 73e8476f9142 |
| children | d0f7a625f27c |
| 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 } |