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#pragma once
#include <util/datetime/base.h>
#include <util/generic/singleton.h>
#include <util/string/cast.h>
#include <util/system/thread.h>
#include <util/system/event.h>
#include <util/system/env.h>
#include <cstdlib>
/* Keeps current time accurate up to 1/10 second */
class TTimeKeeper {
public:
static TInstant GetNow(void) {
return TInstant::MicroSeconds(GetTime());
}
static time_t GetTime(void) {
return Singleton<TTimeKeeper>()->CurrentTime.tv_sec;
}
static const struct timeval& GetTimeval(void) {
return Singleton<TTimeKeeper>()->CurrentTime;
}
TTimeKeeper()
: Thread(&TTimeKeeper::Worker, this)
{
ConstTime = !!GetEnv("TEST_TIME");
if (ConstTime) {
try {
CurrentTime.tv_sec = FromString<ui32>(GetEnv("TEST_TIME"));
} catch (TFromStringException exc) {
ConstTime = false;
}
}
if (!ConstTime) {
gettimeofday(&CurrentTime, nullptr);
Thread.Start();
}
}
~TTimeKeeper() {
if (!ConstTime) {
Exit.Signal();
Thread.Join();
}
}
private:
static const ui32 UpdateInterval = 100000;
struct timeval CurrentTime;
bool ConstTime;
TSystemEvent Exit;
TThread Thread;
static void* Worker(void* arg) {
TTimeKeeper* owner = static_cast<TTimeKeeper*>(arg);
do {
/* Race condition may occur here but locking looks too expensive */
gettimeofday(&owner->CurrentTime, nullptr);
} while (!owner->Exit.WaitT(TDuration::MicroSeconds(UpdateInterval)));
return nullptr;
}
};
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