1 // 2 // Copyright 2016 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 { 24 namespace hardware { 25 namespace bluetooth { 26 namespace async { 27 28 using ReadCallback = std::function<void(int)>; 29 using TimeoutCallback = std::function<void(void)>; 30 31 class AsyncFdWatcher { 32 public: 33 AsyncFdWatcher() = default; 34 ~AsyncFdWatcher(); 35 36 int WatchFdForNonBlockingReads(int file_descriptor, 37 const ReadCallback& on_read_fd_ready_callback); 38 int ConfigureTimeout(const std::chrono::milliseconds timeout, 39 const TimeoutCallback& on_timeout_callback); 40 void StopWatchingFileDescriptors(); 41 42 private: 43 AsyncFdWatcher(const AsyncFdWatcher&) = delete; 44 AsyncFdWatcher& operator=(const AsyncFdWatcher&) = delete; 45 46 int tryStartThread(); 47 int stopThread(); 48 int notifyThread(); 49 void ThreadRoutine(); 50 51 std::atomic_bool running_{false}; 52 std::thread thread_; 53 std::mutex internal_mutex_; 54 std::mutex timeout_mutex_; 55 56 std::map<int, ReadCallback> watched_fds_; 57 int notification_listen_fd_; 58 int notification_write_fd_; 59 TimeoutCallback timeout_cb_; 60 std::chrono::milliseconds timeout_ms_; 61 }; 62 63 } // namespace async 64 } // namespace bluetooth 65 } // namespace hardware 66 } // namespace android 67