1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_atomic.h"
#include <stdlib.h>
apr_status_t apr_atomic_init(apr_pool_t *p)
{
return APR_SUCCESS;
}
apr_uint32_t apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t old, new_val;
old = *mem; /* old is automatically updated on cs failure */
do {
new_val = old + val;
} while (__cs(&old, (cs_t *)mem, new_val));
return old;
}
void apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t old, new_val;
old = *mem; /* old is automatically updated on cs failure */
do {
new_val = old - val;
} while (__cs(&old, (cs_t *)mem, new_val));
}
apr_uint32_t apr_atomic_inc32(volatile apr_uint32_t *mem)
{
return apr_atomic_add32(mem, 1);
}
int apr_atomic_dec32(volatile apr_uint32_t *mem)
{
apr_uint32_t old, new_val;
old = *mem; /* old is automatically updated on cs failure */
do {
new_val = old - 1;
} while (__cs(&old, (cs_t *)mem, new_val));
return new_val != 0;
}
apr_uint32_t apr_atomic_read32(volatile apr_uint32_t *mem)
{
return *mem;
}
void apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
*mem = val;
}
apr_uint32_t apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t swap,
apr_uint32_t cmp)
{
apr_uint32_t old = cmp;
__cs(&old, (cs_t *)mem, swap);
return old; /* old is automatically updated from mem on cs failure */
}
apr_uint32_t apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
{
apr_uint32_t old, new_val;
old = *mem; /* old is automatically updated on cs failure */
do {
new_val = val;
} while (__cs(&old, (cs_t *)mem, new_val));
return old;
}
|