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 #ifdef USE_ATOMICS_BUILTINS
20
apr_atomic_init(apr_pool_t * p)21 APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
22 {
23 return APR_SUCCESS;
24 }
25
apr_atomic_read32(volatile apr_uint32_t * mem)26 APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
27 {
28 return *mem;
29 }
30
apr_atomic_set32(volatile apr_uint32_t * mem,apr_uint32_t val)31 APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
32 {
33 *mem = val;
34 }
35
apr_atomic_add32(volatile apr_uint32_t * mem,apr_uint32_t val)36 APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
37 {
38 return __sync_fetch_and_add(mem, val);
39 }
40
apr_atomic_sub32(volatile apr_uint32_t * mem,apr_uint32_t val)41 APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
42 {
43 __sync_fetch_and_sub(mem, val);
44 }
45
apr_atomic_inc32(volatile apr_uint32_t * mem)46 APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
47 {
48 return __sync_fetch_and_add(mem, 1);
49 }
50
apr_atomic_dec32(volatile apr_uint32_t * mem)51 APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
52 {
53 return __sync_sub_and_fetch(mem, 1);
54 }
55
apr_atomic_cas32(volatile apr_uint32_t * mem,apr_uint32_t with,apr_uint32_t cmp)56 APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
57 apr_uint32_t cmp)
58 {
59 return __sync_val_compare_and_swap(mem, cmp, with);
60 }
61
apr_atomic_xchg32(volatile apr_uint32_t * mem,apr_uint32_t val)62 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
63 {
64 __sync_synchronize();
65
66 return __sync_lock_test_and_set(mem, val);
67 }
68
apr_atomic_casptr(volatile void ** mem,void * with,const void * cmp)69 APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
70 {
71 return (void*) __sync_val_compare_and_swap(mem, cmp, with);
72 }
73
apr_atomic_xchgptr(volatile void ** mem,void * with)74 APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
75 {
76 __sync_synchronize();
77
78 return (void*) __sync_lock_test_and_set(mem, with);
79 }
80
81 #endif /* USE_ATOMICS_BUILTINS */
82