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// Copyright 2019 The Dawn Authors
//
// 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.
#include <stdint.h>
#include <time.h>
#include "dawn/utils/Timer.h"
namespace utils {
namespace {
uint64_t GetCurrentTimeNs() {
struct timespec currentTime;
clock_gettime(CLOCK_MONOTONIC, &currentTime);
return currentTime.tv_sec * 1'000'000'000llu + currentTime.tv_nsec;
}
} // anonymous namespace
class PosixTimer : public Timer {
public:
PosixTimer() : Timer(), mRunning(false) {}
~PosixTimer() override = default;
void Start() override {
mStartTimeNs = GetCurrentTimeNs();
mRunning = true;
}
void Stop() override {
mStopTimeNs = GetCurrentTimeNs();
mRunning = false;
}
double GetElapsedTime() const override {
uint64_t endTimeNs;
if (mRunning) {
endTimeNs = GetCurrentTimeNs();
} else {
endTimeNs = mStopTimeNs;
}
return (endTimeNs - mStartTimeNs) * 1e-9;
}
double GetAbsoluteTime() override { return GetCurrentTimeNs() * 1e-9; }
private:
bool mRunning;
uint64_t mStartTimeNs;
uint64_t mStopTimeNs;
};
Timer* CreateTimer() {
return new PosixTimer();
}
} // namespace utils