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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include "apr_atomic.h"
19 #include "apr_thread_mutex.h"
21 #if !defined(apr_atomic_init) && !defined(APR_OVERRIDE_ATOMIC_INIT)
24 #define NUM_ATOMIC_HASH 7
25 /* shift by 2 to get rid of alignment issues */
26 #define ATOMIC_HASH(x) (unsigned int)(((unsigned long)(x)>>2)%(unsigned int)NUM_ATOMIC_HASH)
27 static apr_thread_mutex_t **hash_mutex;
28 #endif /* APR_HAS_THREADS */
30 apr_status_t apr_atomic_init(apr_pool_t *p)
35 hash_mutex = apr_palloc(p, sizeof(apr_thread_mutex_t*) * NUM_ATOMIC_HASH);
37 for (i = 0; i < NUM_ATOMIC_HASH; i++) {
38 rv = apr_thread_mutex_create(&(hash_mutex[i]),
39 APR_THREAD_MUTEX_DEFAULT, p);
40 if (rv != APR_SUCCESS) {
44 #endif /* APR_HAS_THREADS */
47 #endif /*!defined(apr_atomic_init) && !defined(APR_OVERRIDE_ATOMIC_INIT) */
49 #if !defined(apr_atomic_add) && !defined(APR_OVERRIDE_ATOMIC_ADD)
50 void apr_atomic_add(volatile apr_atomic_t *mem, apr_uint32_t val)
53 apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
56 if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
59 apr_thread_mutex_unlock(lock);
63 #endif /* APR_HAS_THREADS */
65 #endif /*!defined(apr_atomic_add) && !defined(APR_OVERRIDE_ATOMIC_ADD) */
67 #if !defined(apr_atomic_set) && !defined(APR_OVERRIDE_ATOMIC_SET)
68 void apr_atomic_set(volatile apr_atomic_t *mem, apr_uint32_t val)
71 apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
74 if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
77 apr_thread_mutex_unlock(lock);
81 #endif /* APR_HAS_THREADS */
83 #endif /*!defined(apr_atomic_set) && !defined(APR_OVERRIDE_ATOMIC_SET) */
85 #if !defined(apr_atomic_inc) && !defined(APR_OVERRIDE_ATOMIC_INC)
86 void apr_atomic_inc(volatile apr_uint32_t *mem)
89 apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
92 if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
95 apr_thread_mutex_unlock(lock);
99 #endif /* APR_HAS_THREADS */
101 #endif /*!defined(apr_atomic_inc) && !defined(APR_OVERRIDE_ATOMIC_INC) */
103 #if !defined(apr_atomic_dec) && !defined(APR_OVERRIDE_ATOMIC_DEC)
104 int apr_atomic_dec(volatile apr_atomic_t *mem)
107 apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
110 if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
113 apr_thread_mutex_unlock(lock);
118 #endif /* APR_HAS_THREADS */
121 #endif /*!defined(apr_atomic_dec) && !defined(APR_OVERRIDE_ATOMIC_DEC) */
123 #if !defined(apr_atomic_cas) && !defined(APR_OVERRIDE_ATOMIC_CAS)
124 apr_uint32_t apr_atomic_cas(volatile apr_uint32_t *mem, long with, long cmp)
128 apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
130 if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
132 if (prev == (apr_uint32_t)cmp) {
133 *mem = (apr_uint32_t)with;
135 apr_thread_mutex_unlock(lock);
141 if (prev == (apr_uint32_t)cmp) {
142 *mem = (apr_uint32_t)with;
145 #endif /* APR_HAS_THREADS */
147 #endif /*!defined(apr_atomic_cas) && !defined(APR_OVERRIDE_ATOMIC_CAS) */
149 #if !defined(apr_atomic_casptr) && !defined(APR_OVERRIDE_ATOMIC_CASPTR)
150 void *apr_atomic_casptr(volatile void **mem, void *with, const void *cmp)
154 apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
156 if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
157 prev = *(void **)mem;
161 apr_thread_mutex_unlock(lock);
164 return *(void **)mem;
166 prev = *(void **)mem;
171 #endif /* APR_HAS_THREADS */
173 #endif /*!defined(apr_atomic_cas) && !defined(APR_OVERRIDE_ATOMIC_CAS) */