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Add a basic implementation of class CycleTimer
It is used by baseapi_test. Signed-off-by: Stefan Weil <sw@weilnetz.de>
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// (C) Copyright 2017, Google Inc. | ||
// 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. | ||
// Portability include to match the Google test environment. | ||
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#ifndef TESSERACT_UNITTEST_CYCLETIMER_H | ||
#define TESSERACT_UNITTEST_CYCLETIMER_H | ||
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#include "absl/time/clock.h" // for GetCurrentTimeNanos | ||
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// See https://github.com/google/or-tools/blob/master/ortools/base/timer.h | ||
class CycleTimer { | ||
public: | ||
CycleTimer() { | ||
Reset(); | ||
} | ||
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void Reset() { | ||
running_ = false; | ||
sum_ = 0; | ||
} | ||
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// When Start() is called multiple times, only the most recent is used. | ||
void Start() { | ||
running_ = true; | ||
start_ = absl::GetCurrentTimeNanos(); | ||
} | ||
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void Restart() { | ||
sum_ = 0; | ||
Start(); | ||
} | ||
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void Stop() { | ||
if (running_) { | ||
sum_ += absl::GetCurrentTimeNanos() - start_; | ||
running_ = false; | ||
} | ||
} | ||
int64_t GetInMs() const { return GetNanos() / 1000000; } | ||
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protected: | ||
int64_t GetNanos() const { | ||
return running_ ? absl::GetCurrentTimeNanos() - start_ + sum_ : sum_; | ||
} | ||
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private: | ||
bool running_; | ||
int64_t start_; | ||
int64_t sum_; | ||
}; | ||
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#endif // TESSERACT_UNITTEST_CYCLETIMER_H |