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 <poll.h>
20 #include <functional>
21 #include <mutex>
22 #include <vector>
23 
24 namespace android::hardware::sensors::V2_1::subhal::implementation {
25 
26 class MultiPoll {
27   public:
28     explicit MultiPoll(uint64_t periodMs = 0);
29     ~MultiPoll() = default;
30 
31     // TODO(egranata): add support for events other than POLLIN
32     void addDescriptor(int fd);
33     using OnPollIn = std::function<void(int fd)>;
34     int poll(OnPollIn in);
35 
36   private:
37     uint64_t mSamplingPeriodMs;
38     std::mutex mDescriptorsMutex;
39     std::vector<pollfd> mDescriptors;
40 };
41 
42 }  // namespace android::hardware::sensors::V2_1::subhal::implementation
43