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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