1 /*
2  * Copyright (c) 2024 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 OHOS_HDI_POWER_V1_2_HIBERNATE_H
17 #define OHOS_HDI_POWER_V1_2_HIBERNATE_H
18 
19 #include <cstdint>
20 #include <atomic>
21 #include <mutex>
22 
23 namespace OHOS {
24 namespace HDI {
25 namespace Power {
26 namespace V1_2 {
27 class Hibernate {
28 public:
29     Hibernate(const Hibernate &) = delete;
30     Hibernate(const Hibernate &&) = delete;
31     Hibernate &operator=(const Hibernate &) = delete;
32     Hibernate &operator=(const Hibernate &&) = delete;
~Hibernate()33     ~Hibernate() {};
34 
35     void Init();
36     int32_t DoHibernate();
37 
GetInstance()38     static Hibernate &GetInstance()
39     {
40         static Hibernate instance;
41         return instance;
42     }
43 
44 private:
Hibernate()45     Hibernate() {};
46     void InitSwap();
47     bool IsSwapFileExist();
48     int32_t MkSwap();
49     int32_t CheckSwapFile(bool &needToCreateSwapFile);
50     int32_t CheckSwapFileSize(bool &isRightSize);
51     int32_t CreateSwapFile();
52     int32_t RemoveSwapFile();
53     int32_t EnableSwap();
54     int32_t GetResumeOffset(uint64_t &resumeOffset);
55     int32_t GetResumeInfo(std::string &resumeInfo);
56     int32_t WriteOffsetAndResume();
57     int32_t WriteOffset();
58     int32_t WriteResume();
59     int32_t WritePowerState();
60 
61     std::atomic_bool swapFileReady_ {false};
62     std::mutex initMutex_;
63 };
64 } // namespace V1_2
65 } // namespace Power
66 } // namespace HDI
67 } // namespace OHOS
68 
69 #endif // OHOS_HDI_POWER_V1_2_HIBERNATE_H