Mercurial > hg > nginx-vendor-0-5
comparison src/os/unix/ngx_gcc_atomic_sparc64.h @ 110:dad2fe8ecf08 NGINX_0_3_2
nginx 0.3.2
*) Feature: the Sun Studio 10 C compiler support.
*) Feature: the "proxy_upstream_max_fails",
"proxy_upstream_fail_timeout", "fastcgi_upstream_max_fails", and
"fastcgi_upstream_fail_timeout" directives.
author | Igor Sysoev <http://sysoev.ru> |
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date | Wed, 12 Oct 2005 00:00:00 +0400 |
parents | |
children | 408f195b3482 |
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109:97da525033a1 | 110:dad2fe8ecf08 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 /* | |
8 * "casa [r1] 0x80, r2, r0" and | |
9 * "casxa [r1] 0x80, r2, r0" do the following: | |
10 * | |
11 * if ([r1] == r2) { | |
12 * swap(r0, [r1]); | |
13 * } else { | |
14 * r0 = [r1]; | |
15 * } | |
16 * | |
17 * so "r0 == r2" means that the operation was successfull. | |
18 * | |
19 * | |
20 * The "r" means the general register. | |
21 * The "+r" means the general register used for both input and output. | |
22 */ | |
23 | |
24 | |
25 #if (NGX_PTR_SIZE == 4) | |
26 #define NGX_CASA "casa" | |
27 #else | |
28 #define NGX_CASA "casxa" | |
29 #endif | |
30 | |
31 | |
32 static ngx_inline ngx_atomic_uint_t | |
33 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
34 ngx_atomic_uint_t set) | |
35 { | |
36 __asm__ volatile ( | |
37 | |
38 NGX_CASA " [%1] 0x80, %2, %0" | |
39 | |
40 : "+r" (set) : "r" (lock), "r" (old) : "memory"); | |
41 | |
42 return (set == old); | |
43 } | |
44 | |
45 | |
46 static ngx_inline ngx_atomic_int_t | |
47 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
48 { | |
49 ngx_atomic_uint_t old, res; | |
50 | |
51 old = *value; | |
52 | |
53 for ( ;; ) { | |
54 | |
55 res = old + add; | |
56 | |
57 __asm__ volatile ( | |
58 | |
59 NGX_CASA " [%1] 0x80, %2, %0" | |
60 | |
61 : "+r" (res) : "r" (value), "r" (old) : "memory"); | |
62 | |
63 if (res == old) { | |
64 return res; | |
65 } | |
66 | |
67 old = res; | |
68 } | |
69 } |