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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "simple_tick.h"
namespace vespalib::metrics {
namespace {
const TimeStamp oneSec{1.0};
TimeStamp now()
{
using Clock = std::chrono::system_clock;
Clock::time_point now = Clock::now();
return now.time_since_epoch();
}
} // namespace <unnamed>
SimpleTick::SimpleTick()
: _lock(), _runFlag(true), _cond()
{}
TimeStamp
SimpleTick::first()
{
return now();
}
TimeStamp
SimpleTick::next(TimeStamp prev)
{
std::unique_lock<std::mutex> locker(_lock);
while (_runFlag) {
TimeStamp curr = now();
if (curr - prev >= oneSec) {
return curr;
} else if (curr < prev) {
// clock was adjusted backwards
prev = curr;
_cond.wait_for(locker, oneSec);
} else {
_cond.wait_for(locker, oneSec - (curr - prev));
}
}
return now();
}
void
SimpleTick::kill()
{
std::unique_lock<std::mutex> locker(_lock);
_runFlag.store(false);
_cond.notify_all();
}
bool
SimpleTick::alive() const
{
return _runFlag;
}
} // namespace vespalib::metrics
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