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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/fastos/thread.h>
#include <vespa/fastos/cond.h>
#include <vespa/fastos/timestamp.h>
namespace vespalib {
/**
* Clock is a clock that updates the time at defined intervals.
* It is intended used where you want to check the time with low cost, but where
* resolution is not that important.
*/
class Clock : public FastOS_Runnable
{
private:
Clock(const Clock &);
Clock & operator = (const Clock &);
mutable fastos::TimeStamp _timeNS;
int _timePeriodMS;
FastOS_Cond _cond;
bool _stop;
bool _running;
void setTime() const;
void Run(FastOS_ThreadInterface *thisThread, void *arguments) override;
public:
Clock(double timePeriod=0.100);
~Clock();
fastos::TimeStamp getTimeNS() const {
if (!_running) {
setTime();
}
return _timeNS;
}
fastos::TimeStamp getTimeNSAssumeRunning() const { return _timeNS; }
void stop();
};
}
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