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
21APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
22{
23    return APR_SUCCESS;
24}
25
26APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
27{
28    return *mem;
29}
30
31APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
32{
33    *mem = val;
34}
35
36APR_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
41APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
42{
43    __sync_fetch_and_sub(mem, val);
44}
45
46APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
47{
48    return __sync_fetch_and_add(mem, 1);
49}
50
51APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
52{
53    return __sync_sub_and_fetch(mem, 1);
54}
55
56APR_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
62APR_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
69APR_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
74APR_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