1 /* 2 * Copyright (C) 2009 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 TIME_SOURCE_H_ 18 19 #define TIME_SOURCE_H_ 20 21 #include <stdint.h> 22 23 namespace android { 24 25 class TimeSource { 26 public: 27 TimeSource() {} 28 virtual ~TimeSource() {} 29 30 virtual int64_t getRealTimeUs() = 0; 31 32 private: 33 TimeSource(const TimeSource &); 34 TimeSource &operator=(const TimeSource &); 35 }; 36 37 class SystemTimeSource : public TimeSource { 38 public: 39 SystemTimeSource(); 40 41 virtual int64_t getRealTimeUs(); 42 43 private: 44 static int64_t GetSystemTimeUs(); 45 46 int64_t mStartTimeUs; 47 }; 48 49 } // namespace android 50 51 #endif // TIME_SOURCE_H_ 52
