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1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "apr_arch_atomic.h"
18
19 #include <stdlib.h>
20
21 apr_status_t apr_atomic_init(apr_pool_t *p)
22 {
23 #if defined (NEED_ATOMICS_GENERIC64)
24 return apr__atomic_generic64_init(p);
25 #else
26 return APR_SUCCESS;
27 #endif
28 }
29
30 apr_uint32_t apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
31 {
32 apr_uint32_t old, new_val;
33
34 old = *mem; /* old is automatically updated on cs failure */
35 do {
36 new_val = old + val;
37 } while (__cs(&old, (cs_t *)mem, new_val));
38 return old;
39 }
40
41 void apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
42 {
43 apr_uint32_t old, new_val;
44
45 old = *mem; /* old is automatically updated on cs failure */
46 do {
47 new_val = old - val;
48 } while (__cs(&old, (cs_t *)mem, new_val));
49 }
50
51 apr_uint32_t apr_atomic_inc32(volatile apr_uint32_t *mem)
52 {
53 return apr_atomic_add32(mem, 1);
54 }
55
56 int apr_atomic_dec32(volatile apr_uint32_t *mem)
57 {
58 apr_uint32_t old, new_val;
59
60 old = *mem; /* old is automatically updated on cs failure */
61 do {
62 new_val = old - 1;
63 } while (__cs(&old, (cs_t *)mem, new_val));
64
65 return new_val != 0;
66 }
67
68 apr_uint32_t apr_atomic_read32(volatile apr_uint32_t *mem)
69 {
70 return *mem;
71 }
72
73 void apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
74 {
75 *mem = val;
76 }
77
78 apr_uint32_t apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t swap,
79 apr_uint32_t cmp)
80 {
81 apr_uint32_t old = cmp;
82
83 __cs(&old, (cs_t *)mem, swap);
84 return old; /* old is automatically updated from mem on cs failure */
85 }
86
87 #if APR_SIZEOF_VOIDP == 4
88 void *apr_atomic_casptr(volatile void **mem_ptr,
89 void *swap_ptr,
90 const void *cmp_ptr)
91 {
92 __cs1(&cmp_ptr, /* automatically updated from mem on __cs1 failure */
93 mem_ptr, /* set from swap when __cs1 succeeds */
94 &swap_ptr);
95 return (void *)cmp_ptr;
96 }
97 #elif APR_SIZEOF_VOIDP == 8
98 void *apr_atomic_casptr(volatile void **mem_ptr,
99 void *swap_ptr,
100 const void *cmp_ptr)
101 {
102 __csg(&cmp_ptr, /* automatically updated from mem on __csg failure */
103 mem_ptr, /* set from swap when __csg succeeds */
104 &swap_ptr);
105 return (void *)cmp_ptr;
106 }
107 #else
108 #error APR_SIZEOF_VOIDP value not supported
109 #endif /* APR_SIZEOF_VOIDP */
110
111 apr_uint32_t apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
112 {
113 apr_uint32_t old, new_val;
114
115 old = *mem; /* old is automatically updated on cs failure */
116 do {
117 new_val = val;
118 } while (__cs(&old, (cs_t *)mem, new_val));
119
120 return old;
121 }
122
123 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem_ptr, void *new_ptr)
124 {
125 void *old_ptr;
126
127 old_ptr = *(void **)mem_ptr; /* old is automatically updated on cs failure */
128 #if APR_SIZEOF_VOIDP == 4
129 do {
130 } while (__cs1(&old_ptr, mem_ptr, &new_ptr));
131 #elif APR_SIZEOF_VOIDP == 8
132 do {
133 } while (__csg(&old_ptr, mem_ptr, &new_ptr));
134 #else
135 #error APR_SIZEOF_VOIDP value not supported
136 #endif /* APR_SIZEOF_VOIDP */
137
138 return old_ptr;
139 }