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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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_arch_atomic.h"
#include <stdlib.h>
apr_status_t apr_atomic_init(apr_pool_t *p)
{
#if defined(USE_ATOMICS_GENERIC64)
return apr__atomic_generic64_init(p);
#else
return APR_SUCCESS;
#endif
}
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 */
}
#if APR_SIZEOF_VOIDP == 4
void *apr_atomic_casptr(void *volatile *mem_ptr,
void *swap_ptr,
const void *cmp_ptr)
{
__cs1(&cmp_ptr, /* automatically updated from mem on __cs1 failure */
mem_ptr, /* set from swap when __cs1 succeeds */
&swap_ptr);
return (void *)cmp_ptr;
}
#elif APR_SIZEOF_VOIDP == 8
void *apr_atomic_casptr(void *volatile *mem_ptr,
void *swap_ptr,
const void *cmp_ptr)
{
__csg(&cmp_ptr, /* automatically updated from mem on __csg failure */
mem_ptr, /* set from swap when __csg succeeds */
&swap_ptr);
return (void *)cmp_ptr;
}
#else
#error APR_SIZEOF_VOIDP value not supported
#endif /* APR_SIZEOF_VOIDP */
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;
}
APR_DECLARE(void*) apr_atomic_xchgptr(void *volatile *mem_ptr, void *new_ptr)
{
void *old_ptr;
old_ptr = *mem_ptr; /* old is automatically updated on cs failure */
#if APR_SIZEOF_VOIDP == 4
do {
} while (__cs1(&old_ptr, mem_ptr, &new_ptr));
#elif APR_SIZEOF_VOIDP == 8
do {
} while (__csg(&old_ptr, mem_ptr, &new_ptr));
#else
#error APR_SIZEOF_VOIDP value not supported
#endif /* APR_SIZEOF_VOIDP */
return old_ptr;
}
|
