1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef EPOLL_EVENT_POLLER_H 16 #define EPOLL_EVENT_POLLER_H 17 18 #include <atomic> 19 #include <functional> 20 #include <memory> 21 #include <mutex> 22 #include <string> 23 #include <thread> 24 #include <unordered_map> 25 #include <vector> 26 #include "nocopyable.h" 27 28 class EpollEventPoller { 29 public: 30 explicit EpollEventPoller(int timeOut); 31 ~EpollEventPoller(); 32 33 using OnReadableCallback = std::function<void(void)>; 34 using OnWritableCallback = std::function<void(void)>; 35 36 bool AddFileDescriptor(int fd, const OnReadableCallback& onReadable, const OnWritableCallback& onWritable = {}); 37 38 bool RemoveFileDescriptor(int fd); 39 40 bool Init(); 41 bool Start(); 42 bool Stop(); 43 bool Finalize(); 44 45 private: 46 enum State { 47 INITIAL, 48 INITIED, 49 STARTED, 50 }; 51 static constexpr int INVALID_FD = -1; 52 struct EventContext { 53 int fd = INVALID_FD; 54 OnReadableCallback onReadable; 55 OnWritableCallback onWritable; 56 }; 57 using EventContextPtr = std::shared_ptr<EventContext>; 58 59 void Run(); 60 bool UpdateEvent(int op, const EventContextPtr& ctx); 61 void HandleEvent(uint32_t events, const EventContext& ctx); 62 63 bool AddContextLocked(const EventContextPtr& ctx); 64 bool RemoveContextLocked(const EventContextPtr& ctx); 65 66 void OnNotify(); 67 bool Notify(uint64_t value = 1); 68 69 private: 70 std::mutex mutex_; 71 std::mutex vecMutex_; 72 std::thread pollThread_; 73 int timeOut_ = 0; 74 int epollFd_ = INVALID_FD; 75 int eventFd_ = INVALID_FD; 76 std::atomic<int> state_ = INITIAL; 77 std::atomic<bool> running_ = false; 78 std::vector<int> fileDescriptors_; 79 std::unordered_map<int, EventContextPtr> context_; 80 81 DISALLOW_COPY_AND_MOVE(EpollEventPoller); 82 }; 83 #endif // EPOLL_EVENT_POLLER_H 84