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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed 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 _CUTILS_AREF_H_
#define _CUTILS_AREF_H_
#include <stddef.h>
#include <sys/cdefs.h>
#include <cutils/atomic.h>
__BEGIN_DECLS
#define AREF_TO_ITEM(aref, container, member) \
(container *) (((char*) (aref)) - offsetof(container, member))
struct aref
{
volatile int32_t count;
};
static inline void aref_init(struct aref *r)
{
r->count = 1;
}
static inline int32_t aref_count(struct aref *r)
{
return r->count;
}
static inline void aref_get(struct aref *r)
{
android_atomic_inc(&r->count);
}
static inline void aref_put(struct aref *r, void (*release)(struct aref *))
{
if (android_atomic_dec(&r->count) == 1)
release(r);
}
__END_DECLS
#endif // _CUTILS_AREF_H_
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