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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_atomic.h"
#if APR_HAS_THREADS
apr_int32_t apr_atomic_add(volatile apr_atomic_t *mem, apr_int32_t val)
{
apr_atomic_t old, new_val;
old = *mem; /* old is automatically updated on cs failure */
do {
new_val = old + val;
} while (__cs(&old, (cs_t *)mem, new_val));
return new_val;
}
apr_uint32_t apr_atomic_cas(volatile apr_atomic_t *mem, apr_uint32_t swap,
apr_uint32_t cmp)
{
apr_uint32_t old = cmp;
__cs(&old, (cs_t *)mem, swap);
return old; /* old is automatically updated from mem on cs failure */
}
#endif /* APR_HAS_THREADS */
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