1 /* 2 * Copyright (C) 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 #ifndef CHRE_PLATFORM_TIME_H_ 18 #define CHRE_PLATFORM_TIME_H_ 19 20 #include <cstdint> 21 22 #include "chre/util/time.h" 23 24 namespace chre { 25 26 class SystemTime { 27 public: 28 /** 29 * Initializes the system clock. This must be called as part of the 30 * initialization of the runtime. 31 */ 32 static void init(); 33 34 /** 35 * Obtains a monotonic time reference relative to an arbitrary starting point. 36 * There is no mandate that getMonotonicTime and getUptime be different. 37 * 38 * @return The time of the system. 39 */ 40 static Nanoseconds getMonotonicTime(); 41 42 /** 43 * Obtains the uptime of CHRE relative to CHRE initialization. There is no 44 * mandate that getUptime and getMonotonicTime be different. 45 * 46 * @return The uptime of CHRE. 47 */ 48 static Nanoseconds getUptime(); 49 }; 50 51 } // namespace chre 52 53 #endif // CHRE_PLATFORM_TIME_H_ 54