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.
19 #include "apr_atomic.h"
23 apr_int32_t apr_atomic_add(volatile apr_atomic_t *mem, apr_int32_t val)
25 apr_atomic_t old, new_val;
27 old = *mem; /* old is automatically updated on cs failure */
30 } while (__cs(&old, (cs_t *)mem, new_val));
35 apr_uint32_t apr_atomic_cas(volatile apr_atomic_t *mem, apr_uint32_t swap,
38 apr_uint32_t old = cmp;
40 __cs(&old, (cs_t *)mem, swap);
41 return old; /* old is automatically updated from mem on cs failure */
44 #endif /* APR_HAS_THREADS */