1251875Speter/* Licensed to the Apache Software Foundation (ASF) under one or more
2251875Speter * contributor license agreements.  See the NOTICE file distributed with
3251875Speter * this work for additional information regarding copyright ownership.
4251875Speter * The ASF licenses this file to You under the Apache License, Version 2.0
5251875Speter * (the "License"); you may not use this file except in compliance with
6251875Speter * the License.  You may obtain a copy of the License at
7251875Speter *
8251875Speter *     http://www.apache.org/licenses/LICENSE-2.0
9251875Speter *
10251875Speter * Unless required by applicable law or agreed to in writing, software
11251875Speter * distributed under the License is distributed on an "AS IS" BASIS,
12251875Speter * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13251875Speter * See the License for the specific language governing permissions and
14251875Speter * limitations under the License.
15251875Speter */
16251875Speter
17251875Speter#include "apr_arch_atomic.h"
18251875Speter
19251875Speter#ifdef USE_ATOMICS_BUILTINS
20251875Speter
21251875SpeterAPR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p)
22251875Speter{
23251875Speter    return APR_SUCCESS;
24251875Speter}
25251875Speter
26251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem)
27251875Speter{
28251875Speter    return *mem;
29251875Speter}
30251875Speter
31251875SpeterAPR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val)
32251875Speter{
33251875Speter    *mem = val;
34251875Speter}
35251875Speter
36251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val)
37251875Speter{
38251875Speter    return __sync_fetch_and_add(mem, val);
39251875Speter}
40251875Speter
41251875SpeterAPR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val)
42251875Speter{
43251875Speter    __sync_fetch_and_sub(mem, val);
44251875Speter}
45251875Speter
46251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem)
47251875Speter{
48251875Speter    return __sync_fetch_and_add(mem, 1);
49251875Speter}
50251875Speter
51251875SpeterAPR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem)
52251875Speter{
53251875Speter    return __sync_sub_and_fetch(mem, 1);
54251875Speter}
55251875Speter
56251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
57251875Speter                                           apr_uint32_t cmp)
58251875Speter{
59251875Speter    return __sync_val_compare_and_swap(mem, cmp, with);
60251875Speter}
61251875Speter
62251875SpeterAPR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val)
63251875Speter{
64251875Speter    __sync_synchronize();
65251875Speter
66251875Speter    return __sync_lock_test_and_set(mem, val);
67251875Speter}
68251875Speter
69251875SpeterAPR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
70251875Speter{
71251875Speter    return (void*) __sync_val_compare_and_swap(mem, cmp, with);
72251875Speter}
73251875Speter
74251875SpeterAPR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with)
75251875Speter{
76251875Speter    __sync_synchronize();
77251875Speter
78251875Speter    return (void*) __sync_lock_test_and_set(mem, with);
79251875Speter}
80251875Speter
81251875Speter#endif /* USE_ATOMICS_BUILTINS */
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