Mercurial > hg > nginx-vendor-1-0
annotate src/core/ngx_spinlock.c @ 138:8e6d4d96ec4c NGINX_0_3_16
nginx 0.3.16
*) Feature: the ngx_http_map_module.
*) Feature: the "types_hash_max_size" and "types_hash_bucket_size"
directives.
*) Feature: the "ssi_value_length" directive.
*) Feature: the "worker_rlimit_core" directive.
*) Workaround: the connection number in logs was always 1 if nginx was
built by the icc 8.1 or 9.0 compilers with optimization for
Pentium 4.
*) Bugfix: the "config timefmt" SSI command set incorrect time format.
*) Bugfix: nginx did not close connection to IMAP/POP3 backend for the
SSL connections; bug appeared in 0.3.13.
Thanks to Rob Mueller.
*) Bugfix: segmentation fault may occurred in at SSL shutdown; bug
appeared in 0.3.13.
| author | Igor Sysoev <http://sysoev.ru> |
|---|---|
| date | Fri, 16 Dec 2005 00:00:00 +0300 |
| parents | 408f195b3482 |
| children | 73e8476f9142 |
| 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 | |
| 112 | 15 void |
| 16 ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) | |
| 0 | 17 { |
| 18 | |
| 19 #if (NGX_HAVE_ATOMIC_OPS) | |
| 20 | |
| 21 ngx_uint_t tries; | |
| 22 | |
| 23 tries = 0; | |
| 24 | |
| 25 for ( ;; ) { | |
| 26 | |
| 27 if (*lock) { | |
| 28 if (ngx_ncpu > 1 && tries++ < spin) { | |
| 29 continue; | |
| 30 } | |
| 31 | |
| 32 ngx_sched_yield(); | |
| 33 | |
| 34 tries = 0; | |
| 35 | |
| 36 } else { | |
| 37 if (ngx_atomic_cmp_set(lock, 0, 1)) { | |
| 38 return; | |
| 39 } | |
| 40 } | |
| 41 } | |
| 42 | |
| 43 #else | |
| 44 | |
| 45 #if (NGX_THREADS) | |
| 46 | |
| 47 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! | |
| 48 | |
| 49 #endif | |
| 50 | |
| 51 #endif | |
| 52 | |
| 53 } |