apr_atomic.h

Go to the documentation of this file.

/* 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.
 */

#ifndef APR_ATOMIC_H
#define APR_ATOMIC_H

#include "apr.h"
#include "apr_pools.h"

#ifdef __cplusplus
extern "C" {
#endif

APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p);

/*
 * Atomic operations on 32-bit values
 * Note: Each of these functions internally implements a memory barrier
 * on platforms that require it
 */

APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem);

APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val);

APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val);

APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val);

APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem);

APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem);

APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
                              apr_uint32_t cmp);

APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val);

APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp);

APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with);

#ifdef __cplusplus
}
#endif

#endif  /* !APR_ATOMIC_H */