1 /* 2 * Copyright 2022 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 <map> 20 #include <mutex> 21 #include <thread> 22 23 namespace android::hardware::bluetooth::async { 24 25 using ReadCallback = std::function<void(int)>; 26 using TimeoutCallback = std::function<void(void)>; 27 28 class AsyncFdWatcher { 29 public: 30 AsyncFdWatcher() = default; 31 ~AsyncFdWatcher(); 32 33 int WatchFdForNonBlockingReads(int file_descriptor, 34 const ReadCallback& on_read_fd_ready_callback); 35 int ConfigureTimeout(const std::chrono::milliseconds timeout, 36 const TimeoutCallback& on_timeout_callback); 37 void StopWatchingFileDescriptors(); 38 39 private: 40 AsyncFdWatcher(const AsyncFdWatcher&) = delete; 41 AsyncFdWatcher& operator=(const AsyncFdWatcher&) = delete; 42 43 int tryStartThread(); 44 int stopThread(); 45 int notifyThread(); 46 void ThreadRoutine(); 47 48 std::atomic_bool running_{false}; 49 std::thread thread_; 50 std::mutex internal_mutex_; 51 std::mutex timeout_mutex_; 52 53 std::map<int, ReadCallback> watched_fds_; 54 int notification_listen_fd_; 55 int notification_write_fd_; 56 TimeoutCallback timeout_cb_; 57 std::chrono::milliseconds timeout_ms_; 58 }; 59 60 } // namespace android::hardware::bluetooth::async 61