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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __XS_CLOCK_HPP_INCLUDED__
#define __XS_CLOCK_HPP_INCLUDED__
#include "stdint.hpp"
namespace xs
{
class clock_t
{
public:
clock_t ();
~clock_t ();
// CPU's timestamp counter. Returns 0 if it's not available.
static uint64_t rdtsc ();
// High precision timestamp.
static uint64_t now_us ();
// Low precision timestamp. In tight loops generating it can be
// 10 to 100 times faster than the high precision timestamp.
uint64_t now_ms ();
private:
// TSC timestamp of when last time measurement was made.
uint64_t last_tsc;
// Physical time corresponding to the TSC above (in milliseconds).
uint64_t last_time;
clock_t (const clock_t&);
const clock_t &operator = (const clock_t&);
};
}
#endif
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