1/*
2 * Copyright (C) 2013 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 <condition_variable>
20#include <cstddef>
21#include <functional>
22#include <mutex>
23#include <thread>
24
25#include <android-base/thread_annotations.h>
26
27namespace android {
28
29class EventControlThread {
30public:
31    virtual ~EventControlThread();
32
33    virtual void setVsyncEnabled(bool enabled) = 0;
34};
35
36namespace impl {
37
38class EventControlThread final : public android::EventControlThread {
39public:
40    using SetVSyncEnabledFunction = std::function<void(bool)>;
41
42    explicit EventControlThread(SetVSyncEnabledFunction function);
43    ~EventControlThread();
44
45    // EventControlThread implementation
46    void setVsyncEnabled(bool enabled) override;
47
48private:
49    void threadMain();
50
51    std::mutex mMutex;
52    std::condition_variable mCondition;
53
54    const SetVSyncEnabledFunction mSetVSyncEnabled;
55    bool mVsyncEnabled GUARDED_BY(mMutex) = false;
56    bool mKeepRunning GUARDED_BY(mMutex) = true;
57
58    // Must be last so that everything is initialized before the thread starts.
59    std::thread mThread{&EventControlThread::threadMain, this};
60};
61
62} // namespace impl
63} // namespace android
64