Mercurial > hg > nginx
annotate src/os/unix/ngx_gcc_atomic_sparc64.h @ 6339:67422a0a8ed2 stable-1.8
Events: made a failure to create a notification channel non-fatal.
This may happen if eventfd() returns ENOSYS, notably seen on CentOS 5.4.
Such a failure will now just disable the notification mechanism and let
the callers cope with it, instead of failing to start worker processes.
If thread pools are not configured, this can safely be ignored.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Wed, 06 May 2015 17:04:00 +0300 |
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() |