| /* |
| * 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 <array> |
| #include <functional> |
| #include <mutex> |
| #include <thread> |
| |
| #include <android-base/thread_annotations.h> |
| |
| #include <scheduler/TimeKeeper.h> |
| |
| 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()>, nsecs_t time) final; |
| void alarmCancel() final; |
| |
| void dump(std::string&) const final; |
| |
| protected: |
| // For unit testing |
| int mEpollFd = -1; |
| |
| private: |
| enum class DebugState { |
| Reset, |
| Running, |
| Waiting, |
| Reading, |
| InCallback, |
| Terminated, |
| |
| ftl_last = Terminated |
| }; |
| |
| void reset() EXCLUDES(mMutex); |
| void cleanup() REQUIRES(mMutex); |
| void setDebugState(DebugState) EXCLUDES(mMutex); |
| void setCallback(std::function<void()>&&) REQUIRES(mMutex); |
| |
| int mTimerFd = -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); |
| bool mExpectingCallback GUARDED_BY(mMutex) = false; |
| DebugState mDebugState GUARDED_BY(mMutex); |
| }; |
| |
| } // namespace android::scheduler |