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// systemtap grapher
// Copyright (C) 2009 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#ifndef SYSTEMTAP_GRAPHER_TIME_HXX
#define SYSTEMTAP_GRAPHER_TIME_HXX 1
#include <stdint.h>
#include <sys/time.h>
namespace systemtap
{
template<typename T>
class Singleton
{
public:
static T& instance()
{
static T _instance;
return _instance;
}
protected:
Singleton() {}
private:
// Insure that singleton is constructed before main() is called.
struct InstanceBuilder
{
InstanceBuilder()
{
instance();
}
};
static InstanceBuilder _instanceBuilder;
};
template<typename T>
typename Singleton<T>::InstanceBuilder Singleton<T>::_instanceBuilder;
class Time : public Singleton<Time>
{
public:
Time()
: origin(0)
{
origin = getTime();
}
int64_t getTime()
{
timeval tval;
gettimeofday(&tval, 0);
int64_t now = toUs(tval);
return now - origin;
}
static int64_t get()
{
return instance().getTime();
}
static int64_t getAbs()
{
timeval tval;
gettimeofday(&tval, 0);
return toUs(tval);
}
static int64_t toUs(const timeval& t)
{
int64_t result = t.tv_sec * 1000000;
result += t.tv_usec;
return result;
}
int64_t origin;
};
}
#endif
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