Mercurial > hg > nginx
comparison src/os/unix/ngx_gcc_atomic_ppc.h @ 561:e48ebafc6939 release-0.3.2
nginx-0.3.2-RELEASE import
*) 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 <igor@sysoev.ru> |
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date | Wed, 12 Oct 2005 13:50:36 +0000 |
parents | |
children | 9c2f3ed7a247 |
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560:8886091eddd2 | 561:e48ebafc6939 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 /* | |
8 * The ppc assembler treats ";" as comment, so we have to use "\n". | |
9 * The minus in "bne-" is a hint for the branch prediction unit that | |
10 * this branch is unlikely to be taken. | |
11 * The "1b" means the nearest backward label "1" and the "1f" means | |
12 * the nearest forward label "1". | |
13 * | |
14 * The "b" means that the base registers can be used only, i.e. | |
15 * any register except r0. The r0 register always has a zero value and | |
16 * could not be used in "addi r0, r0, 1". | |
17 * The "=&b" means that no input registers can be used. | |
18 */ | |
19 | |
20 static ngx_inline ngx_atomic_uint_t | |
21 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
22 ngx_atomic_uint_t set) | |
23 { | |
24 ngx_atomic_uint_t res, temp; | |
25 | |
26 __asm__ volatile ( | |
27 | |
28 " li %0, 0 \n" /* preset "0" to "res" */ | |
29 " lwarx %1, 0, %2 \n" /* load from [lock] into "temp" */ | |
30 /* and store reservation */ | |
31 " cmpw %1, %3 \n" /* compare "temp" and "old" */ | |
32 " bne- 1f \n" /* not equal */ | |
33 " stwcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */ | |
34 /* is not cleared */ | |
35 " bne- 1f \n" /* the reservation was cleared */ | |
36 " li %0, 1 \n" /* set "1" to "res" */ | |
37 "1: \n" | |
38 | |
39 : "=&b" (res), "=&b" (temp) | |
40 : "b" (lock), "b" (old), "b" (set) | |
41 : "cc", "memory"); | |
42 | |
43 return res; | |
44 } | |
45 | |
46 | |
47 static ngx_inline ngx_atomic_int_t | |
48 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
49 { | |
50 ngx_atomic_uint_t res, temp; | |
51 | |
52 __asm__ volatile ( | |
53 | |
54 "1: lwarx %0, 0, %2 \n" /* load from [value] into "res" */ | |
55 /* and store reservation */ | |
56 " add %1, %0, %3 \n" /* "res" + "add" store in "temp" */ | |
57 " stwcx. %1, 0, %2 \n" /* store "temp" into [value] if reservation */ | |
58 /* is not cleared */ | |
59 " bne- 1b \n" /* try again if reservation was cleared */ | |
60 | |
61 : "=&b" (res), "=&b" (temp) | |
62 : "b" (value), "b" (add) | |
63 : "cc", "memory"); | |
64 | |
65 return res; | |
66 } |