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// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
* Copyright (C) 2010 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Jason Smith <jason.smith@canonical.com>
* Authored by: Alex Launi <alex.launi@gmail.com>
*/
#ifndef TIME_UTIL_H
#define TIME_UTIL_H
#include <time.h>
#include <cstdint>
typedef int64_t DeltaTime;
namespace unity
{
class TimeUtil
{
public:
static DeltaTime TimeDelta (struct timespec const* x, struct timespec const* y)
{
DeltaTime d_sec = ((x->tv_sec - y->tv_sec));
DeltaTime d_nsec = ((x->tv_nsec - y->tv_nsec));
return (d_sec * 1000) + (d_nsec / 1000000);
}
static void SetTimeStruct(struct timespec* timer, struct timespec* sister = 0, DeltaTime sister_relation = 0)
{
struct timespec current;
clock_gettime(CLOCK_MONOTONIC, ¤t);
if (sister)
{
DeltaTime diff = TimeDelta(¤t, sister);
if (diff < sister_relation)
{
DeltaTime remove = sister_relation - diff;
SetTimeBack(¤t, remove);
}
}
timer->tv_sec = current.tv_sec;
timer->tv_nsec = current.tv_nsec;
}
static void SetTimeBack(struct timespec* timeref, DeltaTime remove)
{
timeref->tv_sec -= remove / 1000;
remove = remove % 1000;
if (remove > timeref->tv_nsec / 1000000)
{
timeref->tv_sec--;
timeref->tv_nsec += 1000000000;
}
timeref->tv_nsec -= remove * 1000000;
}
};
namespace time
{
struct Spec
{
Spec()
: ts({0, 0})
{}
void Reset()
{
ts.tv_sec = 0;
ts.tv_nsec = 0;
}
void SetToNow()
{
clock_gettime(CLOCK_MONOTONIC, &ts);
}
DeltaTime TimeDelta(Spec const& other)
{
return TimeUtil::TimeDelta(&ts, &other.ts);
}
operator struct timespec() const
{
return ts;
}
const struct timespec* operator->() const
{
return &ts;
}
private:
struct timespec ts;
};
}
}
#endif // TIME_UTIL_H
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