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comparison src/event/ngx_event_spinlock.c @ 363:f2755a2885c8

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nginx-0.0.7-2004-06-21-23:22:53 import
author Igor Sysoev <igor@sysoev.ru>
date Mon, 21 Jun 2004 19:22:53 +0000
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362:7650aea1816f 363:f2755a2885c8
1
2
3 void _spinlock(ngx_atomic_t *lock)
4 {
5 ngx_int_t tries;
6
7 tries = 0;
8
9 for ( ;; ) {
10
11 if (*lock) {
12 if (ngx_ncpu > 1 && tries++ < 1000) {
13 continue;
14 }
15
16 sched_yield();
17 tries = 0;
18
19 } else {
20 if (ngx_atomic_cmp_set(lock, 0, 1)) {
21 return;
22 }
23 }
24 }
25 }
26