1 #pragma once
2 /*
3  * Copyright (C) 2016 The Android Open Source Project
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 struct private_handle_t;
18 
19 /**
20  * Map the memory associated with hnd->fd or, if already mapped, increment
21  * its reference count.
22  */
23 void* reference_region(
24     const char* op, const private_handle_t* hnd);
25 
26 /**
27  * Decrement the reference count associated with hnd->fd, unmapping its
28  * memory iff the reference count reaches 0.
29  */
30 int unreference_region(const char* op, const private_handle_t* hnd);
31