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1 /*
2  * Copyright (C) 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <atomic>
20 #include <condition_variable>
21 #include <mutex>
22 #include <thread>
23 
24 namespace android::hardware::sensors::V2_0::subhal::implementation {
25 
26 class SensorBase;
27 
28 class SensorThread {
29   public:
30     explicit SensorThread(SensorBase*);
31     ~SensorThread();
32 
33     void notifyAll();
34     void start();
35     void stop();
36     std::unique_lock<std::mutex> lock();
37     void join();
38 
39     bool isStopped() const;
40 
41     template <typename Predicate>
wait(Predicate p)42     void wait(Predicate p) {
43         auto lck(lock());
44         mWaitCV.wait(lck, p);
45     }
46 
47   private:
48     SensorBase* mSensor;
49     std::atomic_bool mStopThread;
50     std::condition_variable mWaitCV;
51     std::mutex mRunMutex;
52     std::thread mThread;
53 };
54 
55 }  // namespace android::hardware::sensors::V2_0::subhal::implementation
56