62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/*
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* SPDX-FileCopyrightText: Copyright (c) 2017 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __NV_KREF_H__
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#define __NV_KREF_H__
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#include <asm/atomic.h>
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typedef struct nv_kref
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{
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atomic_t refcount;
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} nv_kref_t;
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static inline void nv_kref_init(nv_kref_t *nv_kref)
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{
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atomic_set(&nv_kref->refcount, 1);
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}
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static inline void nv_kref_get(nv_kref_t *nv_kref)
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{
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atomic_inc(&nv_kref->refcount);
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}
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static inline int nv_kref_put(nv_kref_t *nv_kref,
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void (*release)(nv_kref_t *nv_kref))
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{
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if (atomic_dec_and_test(&nv_kref->refcount))
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{
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release(nv_kref);
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return 1;
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}
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return 0;
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}
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static inline unsigned int nv_kref_read(const nv_kref_t *nv_kref)
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{
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return atomic_read(&nv_kref->refcount);
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}
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#endif // __NV_KREF_H__
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