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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Data Differential YATL (i.e. libtest) library
*
* Copyright (C) 2012 Data Differential, http://datadifferential.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#pragma once
#include <ctime>
#include <ostream>
#ifdef __MACH__
# include <mach/clock.h>
# include <mach/mach.h>
#else
# include <sys/time.h>
#endif
namespace libtest {
class Timer {
public:
Timer()
{
_begin.tv_sec= 0;
_begin.tv_nsec= 0;
_end.tv_sec= 0;
_end.tv_nsec= 0;
}
void reset()
{
_end.tv_sec= 0;
_end.tv_nsec= 0;
_time(_begin);
}
void sample()
{
_time(_end);
}
void difference(struct timespec& arg) const
{
if ((_end.tv_nsec -_begin.tv_nsec) < 0)
{
arg.tv_sec= _end.tv_sec -_begin.tv_sec-1;
arg.tv_nsec= 1000000000 +_end.tv_nsec -_begin.tv_nsec;
}
else
{
arg.tv_sec= _end.tv_sec -_begin.tv_sec;
arg.tv_nsec= _end.tv_nsec -_begin.tv_nsec;
}
}
private:
void _time(struct timespec& ts)
{
#ifdef __MACH__ // OSX lacks clock_gettime()
clock_serv_t _clock_serv;
mach_timespec_t _mach_timespec;
host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &_clock_serv);
clock_get_time(_clock_serv, &_mach_timespec);
mach_port_deallocate(mach_task_self(), _clock_serv);
ts.tv_sec= _mach_timespec.tv_sec;
ts.tv_nsec= _mach_timespec.tv_nsec;
#else
clock_gettime(CLOCK_REALTIME, &ts);
#endif
}
private:
struct timespec _begin;
struct timespec _end;
};
std::ostream& operator<<(std::ostream& output, const libtest::Timer& arg);
} // namespace libtest
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