| /* Copyright 2015 The TensorFlow Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==============================================================================*/ |
| #ifndef TENSORFLOW_CORE_PLATFORM_ENV_TIME_H_ |
| #define TENSORFLOW_CORE_PLATFORM_ENV_TIME_H_ |
| |
| #include <stdint.h> |
| |
| #include "tensorflow/core/platform/types.h" |
| |
| namespace tensorflow { |
| |
| /// \brief An interface used by the tensorflow implementation to |
| /// access timer related operations. |
| class EnvTime { |
| public: |
| static constexpr uint64 kMicrosToPicos = 1000ULL * 1000ULL; |
| static constexpr uint64 kMicrosToNanos = 1000ULL; |
| static constexpr uint64 kMillisToMicros = 1000ULL; |
| static constexpr uint64 kMillisToNanos = 1000ULL * 1000ULL; |
| static constexpr uint64 kSecondsToMillis = 1000ULL; |
| static constexpr uint64 kSecondsToMicros = 1000ULL * 1000ULL; |
| static constexpr uint64 kSecondsToNanos = 1000ULL * 1000ULL * 1000ULL; |
| |
| EnvTime(); |
| virtual ~EnvTime() = default; |
| |
| /// \brief Returns a default impl suitable for the current operating |
| /// system. |
| /// |
| /// The result of Default() belongs to this library and must never be deleted. |
| static EnvTime* Default(); |
| |
| /// \brief Returns the number of nano-seconds since the Unix epoch. |
| virtual uint64 NowNanos() const = 0; |
| |
| /// \brief Returns the number of micro-seconds since the Unix epoch. |
| virtual uint64 NowMicros() const { return NowNanos() / kMicrosToNanos; } |
| |
| /// \brief Returns the number of seconds since the Unix epoch. |
| virtual uint64 NowSeconds() const { return NowNanos() / kSecondsToNanos; } |
| }; |
| |
| } // namespace tensorflow |
| |
| #endif // TENSORFLOW_CORE_PLATFORM_ENV_TIME_H_ |