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 NETDUTILS_STOPWATCH_H 18 #define NETDUTILS_STOPWATCH_H 19 20 #include <chrono> 21 22 namespace android { 23 namespace netdutils { 24 25 class Stopwatch { 26 private: 27 using clock = std::chrono::steady_clock; 28 using time_point = std::chrono::time_point<clock>; 29 30 public: Stopwatch()31 Stopwatch() : mStart(clock::now()) {} 32 virtual ~Stopwatch() = default; 33 timeTakenUs()34 int64_t timeTakenUs() const { return getElapsedUs(clock::now()); } getTimeAndResetUs()35 int64_t getTimeAndResetUs() { 36 const auto& now = clock::now(); 37 int64_t elapsed = getElapsedUs(now); 38 mStart = now; 39 return elapsed; 40 } 41 42 private: 43 time_point mStart; 44 getElapsedUs(const time_point & now)45 int64_t getElapsedUs(const time_point& now) const { 46 return (std::chrono::duration_cast<std::chrono::microseconds>(now - mStart)).count(); 47 } 48 }; 49 50 } // namespace netdutils 51 } // namespace android 52 53 #endif // NETDUTILS_STOPWATCH_H 54