1 /*
2  * Copyright (C) 2017 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 #ifndef A_LOOPER_H_
18 
19 #define A_LOOPER_H_
20 
21 #include <android-base/macros.h>
22 #include <utils/Condition.h>
23 #include <utils/Mutex.h>
24 
25 #include <set>
26 
27 struct ASensorEventQueue;
28 
29 struct ALooper {
30     ALooper();
31 
32     void signalSensorEvents(ASensorEventQueue *queue);
33     void wake();
34 
35     int pollOnce(int timeoutMillis, int *outFd, int *outEvents, void **outData);
36 
37     void invalidateSensorQueue(ASensorEventQueue *queue);
38 
39 private:
40     android::Mutex mLock;
41     android::Condition mCondition;
42 
43     std::set<ASensorEventQueue *> mReadyQueues;
44     bool mAwoken;
45 
46     DISALLOW_COPY_AND_ASSIGN(ALooper);
47 };
48 
49 #endif  // A_LOOPER_H_
50