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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "TimeKeeper.h"
#include <android-base/thread_annotations.h>
#include <array>
#include <thread>
namespace android::scheduler {
class Timer : public TimeKeeper {
public:
Timer();
~Timer();
nsecs_t now() const final;
// NB: alarmAt and alarmCancel are threadsafe; with the last-returning function being effectual
// Most users will want to serialize thes calls so as to be aware of the timer state.
void alarmAt(std::function<void()> const& cb, nsecs_t time) final;
void alarmCancel() final;
void dump(std::string& result) const final;
private:
enum class DebugState { Reset, Running, Waiting, Reading, InCallback, Terminated };
void reset();
void cleanup();
void setDebugState(DebugState state) EXCLUDES(mMutex);
const char* strDebugState(DebugState state) const;
int mTimerFd = -1;
int mEpollFd = -1;
std::array<int, 2> mPipes = {-1, -1};
std::thread mDispatchThread;
void threadMain();
bool dispatch();
void endDispatch();
mutable std::mutex mMutex;
std::function<void()> mCallback GUARDED_BY(mMutex);
DebugState mDebugState GUARDED_BY(mMutex);
};
} // namespace android::scheduler
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