Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_gcc_atomic_sparc64.h @ 5267:13c006f0c40e
Events: honor NGX_USE_GREEDY_EVENT when kqueue support is enabled.
Currently this flag is needed for epoll and rtsig, and though these methods
usually present on different platforms than kqueue, nginx can be compiled to
support all of them.
author | Valentin Bartenev <vbart@nginx.com> |
---|---|
date | Sat, 13 Jul 2013 03:24:30 +0400 |
parents | 67653855682e |
children |
rev | line source |
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561 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
561 | 5 */ |
6 | |
7 | |
8 /* | |
9 * "casa [r1] 0x80, r2, r0" and | |
10 * "casxa [r1] 0x80, r2, r0" do the following: | |
11 * | |
12 * if ([r1] == r2) { | |
13 * swap(r0, [r1]); | |
14 * } else { | |
15 * r0 = [r1]; | |
16 * } | |
17 * | |
4572
67653855682e
Fixed spelling in multiline C comments.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
|
18 * so "r0 == r2" means that the operation was successful. |
561 | 19 * |
20 * | |
21 * The "r" means the general register. | |
22 * The "+r" means the general register used for both input and output. | |
23 */ | |
24 | |
25 | |
26 #if (NGX_PTR_SIZE == 4) | |
27 #define NGX_CASA "casa" | |
28 #else | |
29 #define NGX_CASA "casxa" | |
30 #endif | |
31 | |
32 | |
33 static ngx_inline ngx_atomic_uint_t | |
34 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
35 ngx_atomic_uint_t set) | |
36 { | |
37 __asm__ volatile ( | |
38 | |
39 NGX_CASA " [%1] 0x80, %2, %0" | |
40 | |
41 : "+r" (set) : "r" (lock), "r" (old) : "memory"); | |
42 | |
43 return (set == old); | |
577 | 44 } |
561 | 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 old, res; | |
51 | |
52 old = *value; | |
53 | |
54 for ( ;; ) { | |
55 | |
56 res = old + add; | |
57 | |
58 __asm__ volatile ( | |
59 | |
60 NGX_CASA " [%1] 0x80, %2, %0" | |
61 | |
62 : "+r" (res) : "r" (value), "r" (old) : "memory"); | |
63 | |
64 if (res == old) { | |
65 return res; | |
66 } | |
67 | |
68 old = res; | |
69 } | |
70 } | |
563 | 71 |
72 | |
73 #if (NGX_SMP) | |
74 #define ngx_memory_barrier() \ | |
75 __asm__ volatile ( \ | |
76 "membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad" \ | |
77 ::: "memory") | |
78 #else | |
79 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") | |
80 #endif | |
611 | 81 |
82 #define ngx_cpu_pause() |