1 /* 2 * Copyright (C) 2017 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 #ifndef CHRE_PLATFORM_LINUX_PLATFORM_LOG_BASE_H_ 18 #define CHRE_PLATFORM_LINUX_PLATFORM_LOG_BASE_H_ 19 20 #include <condition_variable> 21 #include <mutex> 22 #include <thread> 23 #include <queue> 24 25 namespace chre { 26 27 /** 28 * Storage for the Linux implementation of the PlatformLog class. 29 */ 30 class PlatformLogBase { 31 protected: 32 /** 33 * A looper method that idles on a condition variable on logs becoming 34 * available. When logs are available, they are output via std::cout. 35 */ 36 void logLooper(); 37 38 //! The thread that waits on incoming log messages and sends them out to 39 //! std::cout. 40 std::thread mLoggerThread; 41 42 //! A mutex to guard the shared queue and exit condition of this class. 43 std::mutex mMutex; 44 45 //! The condition variable to signal that the log looper has messages 46 //! available to output. 47 std::condition_variable mConditionVariable; 48 49 //! A queue of incoming log messages. 50 std::queue<char *> mLogQueue; 51 52 //! A flag to indicate that the logger should shut down. 53 bool mStopLogger = false; 54 }; 55 56 } // namespace chre 57 58 #endif // CHRE_PLATFORM_LINUX_PLATFORM_LOG_BASE_H_ 59