1 /*
2  * Copyright (c) 2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef NEURAL_NETWORK_RUNTIME_MEMORY_MANAGER_H
17 #define NEURAL_NETWORK_RUNTIME_MEMORY_MANAGER_H
18 
19 #include <unordered_map>
20 #include <mutex>
21 
22 #include "interfaces/kits/c/neural_network_runtime/neural_network_runtime_type.h"
23 
24 namespace OHOS {
25 namespace NeuralNetworkRuntime {
26 const int INVALID_FD = -1;
27 
28 struct Memory {
29     int fd;
30     const void* data;
31     size_t length;
32 };
33 
34 class MemoryManager {
35 public:
36     ~MemoryManager() = default;
37 
38     void* MapMemory(int fd, size_t length);
39     OH_NN_ReturnCode UnMapMemory(const void* buffer);
40     OH_NN_ReturnCode GetMemory(const void* buffer, Memory& memory);
41 
GetInstance()42     static MemoryManager* GetInstance()
43     {
44         static MemoryManager instance;
45         return &instance;
46     }
47 
48 private:
MemoryManager()49     MemoryManager() {};
50     MemoryManager(const MemoryManager&) = delete;
51     MemoryManager& operator=(const MemoryManager&) = delete;
52 
53 private:
54     // key: OH_NN_Memory, value: fd
55     std::unordered_map<const void*, Memory> m_memorys;
56     std::mutex m_mtx;
57 };
58 } // namespace NeuralNetworkRuntime
59 } // OHOS
60 #endif // NEURAL_NETWORK_RUNTIME_MEMORY_MANAGER_H