1 /*
2  * Copyright (C) 2018 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 POWER_LIBPERFMGR_INTERACTIONHANDLER_H_
18 #define POWER_LIBPERFMGR_INTERACTIONHANDLER_H_
19 
20 #include <condition_variable>
21 #include <memory>
22 #include <mutex>
23 #include <string>
24 #include <thread>
25 
26 #include <perfmgr/HintManager.h>
27 
28 using ::android::perfmgr::HintManager;
29 
30 enum interaction_state {
31     INTERACTION_STATE_UNINITIALIZED,
32     INTERACTION_STATE_IDLE,
33     INTERACTION_STATE_INTERACTION,
34     INTERACTION_STATE_WAITING,
35 };
36 
37 class InteractionHandler {
38   public:
39     InteractionHandler(std::shared_ptr<HintManager> const &hint_manager);
40     ~InteractionHandler();
41     bool Init();
42     void Exit();
43     void Acquire(int32_t duration);
44 
45   private:
46     void Release();
47     void WaitForIdle(int32_t wait_ms, int32_t timeout_ms);
48     void AbortWaitLocked();
49     void Routine();
50 
51     void PerfLock();
52     void PerfRel();
53 
54     size_t CalcTimespecDiffMs(struct timespec start, struct timespec end);
55 
56     enum interaction_state mState;
57 
58     int mIdleFd;
59     int mEventFd;
60 
61     int32_t mWaitMs;
62     int32_t mMinDurationMs;
63     int32_t mMaxDurationMs;
64     int32_t mDurationMs;
65 
66     struct timespec mLastTimespec;
67 
68     std::unique_ptr<std::thread> mThread;
69     std::mutex mLock;
70     std::condition_variable mCond;
71     std::shared_ptr<HintManager> mHintManager;
72 };
73 
74 #endif  // POWER_LIBPERFMGR_INTERACTIONHANDLER_H_
75