time_support.c 3.69 KB
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/***************************************************************************
 *   Copyright (C) 2006 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
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 *   Copyright (C) 2007,2008 yvind Harboe                                 *
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 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
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 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
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 *   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.             *
 ***************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "time_support.h"
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#include "log.h"
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/* calculate difference between two struct timeval values */
int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
{
	if (x->tv_usec < y->tv_usec)
	{
		int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
		y->tv_usec -= 1000000 * nsec;
		y->tv_sec += nsec;
	}
	if (x->tv_usec - y->tv_usec > 1000000) {
		int nsec = (x->tv_usec - y->tv_usec) / 1000000;
		y->tv_usec += 1000000 * nsec;
		y->tv_sec -= nsec;
	}

	result->tv_sec = x->tv_sec - y->tv_sec;
	result->tv_usec = x->tv_usec - y->tv_usec;

	/* Return 1 if result is negative. */
	return x->tv_sec < y->tv_sec;
}

/* add two struct timeval values */
int timeval_add(struct timeval *result, struct timeval *x, struct timeval *y)
{
	result->tv_sec = x->tv_sec + y->tv_sec;
	
	result->tv_usec = x->tv_usec + y->tv_usec;
	
	while (result->tv_usec > 1000000)
	{
		result->tv_usec -= 1000000;
		result->tv_sec++;
	}
	
	return 0;
}

int timeval_add_time(struct timeval *result, int sec, int usec)
{
	result->tv_sec += sec;
	result->tv_usec += usec;
	
	while (result->tv_usec > 1000000)
	{
		result->tv_usec -= 1000000;
		result->tv_sec++;
	}
	
	return 0;
}

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void duration_start_measure(duration_t *duration)
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{
	gettimeofday(&duration->start, NULL);
}

int duration_stop_measure(duration_t *duration, char **text)
{
	struct timeval end;
	
	gettimeofday(&end, NULL);
	
	timeval_subtract(&duration->duration, &end, &duration->start);
	
	if (text)
	{
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		float t;
		t=duration->duration.tv_sec;
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		t += (float)duration->duration.tv_usec/1000000.0;
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		*text = malloc(100);
		snprintf(*text, 100, "%fs", t);
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	}
	
	return ERROR_OK;
}
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long long timeval_ms()
{
	struct timeval now; 
	long long t=0;
	gettimeofday(&now, NULL);
	
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	t += now.tv_usec/1000;
	t += now.tv_sec*1000;
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	return t;
}