Mercurial > hg > nginx-vendor-current
annotate src/core/ngx_spinlock.c @ 670:ad45b044f1e5 NGINX_1_1_19
nginx 1.1.19
*) Security: specially crafted mp4 file might allow to overwrite memory
locations in a worker process if the ngx_http_mp4_module was used,
potentially resulting in arbitrary code execution (CVE-2012-2089).
Thanks to Matthew Daley.
*) Bugfix: nginx/Windows might be terminated abnormally.
Thanks to Vincent Lee.
*) Bugfix: nginx hogged CPU if all servers in an upstream were marked as
"backup".
*) Bugfix: the "allow" and "deny" directives might be inherited
incorrectly if they were used with IPv6 addresses.
*) Bugfix: the "modern_browser" and "ancient_browser" directives might
be inherited incorrectly.
*) Bugfix: timeouts might be handled incorrectly on Solaris/SPARC.
*) Bugfix: in the ngx_http_mp4_module.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Thu, 12 Apr 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 } |