Mercurial > hg > nginx-vendor-0-8
comparison src/core/ngx_spinlock.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 41ccba1aba45 |
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-1:000000000000 | 0:f0b350454894 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin) | |
12 { | |
13 | |
14 #if (NGX_HAVE_ATOMIC_OPS) | |
15 | |
16 ngx_uint_t tries; | |
17 | |
18 tries = 0; | |
19 | |
20 for ( ;; ) { | |
21 | |
22 if (*lock) { | |
23 if (ngx_ncpu > 1 && tries++ < spin) { | |
24 continue; | |
25 } | |
26 | |
27 ngx_sched_yield(); | |
28 | |
29 tries = 0; | |
30 | |
31 } else { | |
32 if (ngx_atomic_cmp_set(lock, 0, 1)) { | |
33 return; | |
34 } | |
35 } | |
36 } | |
37 | |
38 #else | |
39 | |
40 #if (NGX_THREADS) | |
41 | |
42 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined ! | |
43 | |
44 #endif | |
45 | |
46 #endif | |
47 | |
48 } |