Mercurial > hg > nginx-vendor-current
annotate src/core/ngx_spinlock.c @ 24:420dd3f9e703 NGINX_0_1_12
nginx 0.1.12
*) Feature: the %request_length log parameter.
*) Bugfix: when using the /dev/poll, select and poll on the platforms,
where these methods may do the false reports, there may be the long
delay when the request was passed via the keep-alive connection. It
may be at least on Solaris when using the /dev/poll.
*) Bugfix: the send_lowat directive is ignored on Linux because Linux
does not support the SO_SNDLOWAT option.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Mon, 06 Dec 2004 00:00:00 +0300 |
parents | f0b350454894 |
children | 41ccba1aba45 |
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 | |
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 } |