62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _CUTILS_AREF_H_
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#define _CUTILS_AREF_H_
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#include <stddef.h>
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#include <sys/cdefs.h>
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#ifdef ANDROID_SMP
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#include <cutils/atomic-inline.h>
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#else
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#include <cutils/atomic.h>
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#endif
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__BEGIN_DECLS
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#define AREF_TO_ITEM(aref, container, member) \
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(container *) (((char*) (aref)) - offsetof(container, member))
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struct aref
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{
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volatile int32_t count;
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};
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static inline void aref_init(struct aref *r)
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{
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r->count = 1;
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}
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static inline int32_t aref_count(struct aref *r)
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{
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return r->count;
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}
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static inline void aref_get(struct aref *r)
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{
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android_atomic_inc(&r->count);
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}
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static inline void aref_put(struct aref *r, void (*release)(struct aref *))
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{
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if (android_atomic_dec(&r->count) == 1)
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release(r);
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}
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__END_DECLS
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#endif // _CUTILS_AREF_H_
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