Mercurial > hg > nginx-vendor-0-8
annotate src/core/ngx_spinlock.c @ 54:bcb5fce0b038 NGINX_0_1_27
nginx 0.1.27
*) Feature: the "blocked" parameter of the "valid_referers" directive.
*) Change: the errors while handling the request header now logged at
"info" level. The server name and the "Host" and "Referer" header
lines also logged.
*) Change: the "Host" header line is also logged in error log.
*) Feature: the proxy_pass_unparsed_uri directive. The special handling
of the "://" symbols in URI, appeared in 0.1.11 version, now is
canceled.
*) Bugfix: nginx could not be built on FreeBSD and Linux, if the
--without-ngx_http_auth_basic_module configuration parameter was
used.
| author | Igor Sysoev <http://sysoev.ru> |
|---|---|
| date | Mon, 28 Mar 2005 00:00:00 +0400 |
| parents | 41ccba1aba45 |
| children | 408f195b3482 |
| 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 | |
| 42 | 11 /* |
| 12 * TODO: the P4 optimized assembler version with the "pause" operation | |
| 13 */ | |
| 14 | |
| 0 | 15 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) |
| 16 { | |
| 17 | |
| 18 #if (NGX_HAVE_ATOMIC_OPS) | |
| 19 | |
| 20 ngx_uint_t tries; | |
| 21 | |
| 22 tries = 0; | |
| 23 | |
| 24 for ( ;; ) { | |
| 25 | |
| 26 if (*lock) { | |
| 27 if (ngx_ncpu > 1 && tries++ < spin) { | |
| 28 continue; | |
| 29 } | |
| 30 | |
| 31 ngx_sched_yield(); | |
| 32 | |
| 33 tries = 0; | |
| 34 | |
| 35 } else { | |
| 36 if (ngx_atomic_cmp_set(lock, 0, 1)) { | |
| 37 return; | |
| 38 } | |
| 39 } | |
| 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 } |