apr_atomic.h

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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.
 */
 
#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);
 
/*
 * Atomic operations on 64-bit values
 * Note: Each of these functions internally implements a memory barrier
 * on platforms that require it
 */
 
APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem);
 
APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val);
 
APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val);
 
APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val);
 
APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem);
 
APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem);
 
APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
                              apr_uint64_t cmp);
 
APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val);
 
APR_DECLARE(void*) apr_atomic_casptr(void *volatile *mem, void *with, const void *cmp);
 
APR_DECLARE(void*) apr_atomic_xchgptr(void *volatile *mem, void *with);
 
#ifdef __cplusplus
}
#endif
 
#endif  /* !APR_ATOMIC_H */