Mercurial > hg > nginx-vendor-current
annotate src/core/ngx_spinlock.c @ 678:981b4c44593b NGINX_1_3_2
nginx 1.3.2
*) Change: the "single" parameter of the "keepalive" directive is now
ignored.
*) Change: SSL compression is now disabled when using all versions of
OpenSSL, including ones prior to 1.0.0.
*) Feature: it is now possible to use the "ip_hash" directive to balance
IPv6 clients.
*) Feature: the $status variable can now be used not only in the
"log_format" directive.
*) Bugfix: a segmentation fault might occur in a worker process on
shutdown if the "resolver" directive was used.
*) Bugfix: a segmentation fault might occur in a worker process if the
ngx_http_mp4_module was used.
*) Bugfix: in the ngx_http_mp4_module.
*) Bugfix: a segmentation fault might occur in a worker process if
conflicting wildcard server names were used.
*) Bugfix: nginx might be terminated abnormally on a SIGBUS signal on
ARM platform.
*) Bugfix: an alert "sendmsg() failed (9: Bad file number)" on HP-UX
while reconfiguration.
author | Igor Sysoev <http://sysoev.ru> |
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date | Tue, 26 Jun 2012 00:00:00 +0400 |
parents | d0f7a625f27c |
children |
rev | line source |
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0 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
660 | 4 * Copyright (C) Nginx, Inc. |
0 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
112 | 12 void |
160 | 13 ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin) |
0 | 14 { |
15 | |
16 #if (NGX_HAVE_ATOMIC_OPS) | |
17 | |
160 | 18 ngx_uint_t i, n; |
0 | 19 |
20 for ( ;; ) { | |
21 | |
160 | 22 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
23 return; | |
24 } | |
25 | |
26 if (ngx_ncpu > 1) { | |
27 | |
28 for (n = 1; n < spin; n <<= 1) { | |
0 | 29 |
160 | 30 for (i = 0; i < n; i++) { |
31 ngx_cpu_pause(); | |
32 } | |
0 | 33 |
160 | 34 if (*lock == 0 && ngx_atomic_cmp_set(lock, 0, value)) { |
35 return; | |
36 } | |
0 | 37 } |
38 } | |
160 | 39 |
40 ngx_sched_yield(); | |
0 | 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 } |