/***************************************************************************
 *   Copyright (C) 2006 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifndef TIME_SUPPORT_H
#define TIME_SUPPORT_H

#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y);
int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y);
int timeval_add_time(struct timeval *result, long sec, long usec);

/// @returns gettimeofday() timeval as 64-bit in ms
int64_t timeval_ms(void);

struct duration
{
	struct timeval start;
	struct timeval elapsed;
};

/// Update the duration->start field to start the @a duration measurement.
int duration_start(struct duration *duration);
/// Update the duration->elapsed field to finish the @a duration measurment.
int duration_measure(struct duration *duration);

/// @returns Elapsed time in seconds.
float duration_elapsed(struct duration *duration);
/// @returns KB/sec for the elapsed @a duration and @a count bytes.
float duration_kbps(struct duration *duration, size_t count);

#endif /* TIME_SUPPORT_H */