Mercurial > hg > nginx
comparison src/core/ngx_spinlock.c @ 373:018569a8f09c
nginx-0.0.7-2004-06-30-19:30:41 import
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Wed, 30 Jun 2004 15:30:41 +0000 |
| parents | src/event/ngx_event_spinlock.c@f2755a2885c8 |
| children | 5cdc4838d4e8 |
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| 372:c9fdfccebc49 | 373:018569a8f09c |
|---|---|
| 1 | |
| 2 #include <ngx_config.h> | |
| 3 #include <ngx_core.h> | |
| 4 | |
| 5 | |
| 6 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) | |
| 7 { | |
| 8 ngx_uint_t tries; | |
| 9 | |
| 10 tries = 0; | |
| 11 | |
| 12 for ( ;; ) { | |
| 13 | |
| 14 if (*lock) { | |
| 15 if (ngx_ncpu > 1 && tries++ < spin) { | |
| 16 continue; | |
| 17 } | |
| 18 | |
| 19 ngx_sched_yield(); | |
| 20 | |
| 21 tries = 0; | |
| 22 | |
| 23 } else { | |
| 24 if (ngx_atomic_cmp_set(lock, 0, 1)) { | |
| 25 return; | |
| 26 } | |
| 27 } | |
| 28 } | |
| 29 } |