105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/***************************************************************************
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* Copyright (C) 2006 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* *
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* Copyright (C) 2007,2008 Øyvind Harboe *
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* oyvind.harboe@zylin.com *
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* *
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* Copyright (C) 2008 by Spencer Oliver *
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* spen@spen-soft.co.uk *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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***************************************************************************/
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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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/* calculate difference between two struct timeval values */
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int timeval_subtract(struct timeval *result, struct timeval *x, struct timeval *y)
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{
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if (x->tv_usec < y->tv_usec) {
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int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
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y->tv_usec -= 1000000 * nsec;
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y->tv_sec += nsec;
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}
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if (x->tv_usec - y->tv_usec > 1000000) {
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int nsec = (x->tv_usec - y->tv_usec) / 1000000;
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y->tv_usec += 1000000 * nsec;
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y->tv_sec -= nsec;
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}
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result->tv_sec = x->tv_sec - y->tv_sec;
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result->tv_usec = x->tv_usec - y->tv_usec;
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/* Return 1 if result is negative. */
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return x->tv_sec < y->tv_sec;
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}
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int timeval_add_time(struct timeval *result, long sec, long usec)
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{
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result->tv_sec += sec;
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result->tv_usec += usec;
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while (result->tv_usec > 1000000) {
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result->tv_usec -= 1000000;
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result->tv_sec++;
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}
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return 0;
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}
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/* compare two timevals and return -1/0/+1 accordingly */
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int timeval_compare(const struct timeval *x, const struct timeval *y)
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{
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if (x->tv_sec < y->tv_sec)
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return -1;
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else if (x->tv_sec > y->tv_sec)
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return 1;
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else if (x->tv_usec < y->tv_usec)
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return -1;
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else if (x->tv_usec > y->tv_usec)
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return 1;
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else
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return 0;
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}
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int duration_start(struct duration *duration)
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{
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return gettimeofday(&duration->start, NULL);
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}
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int duration_measure(struct duration *duration)
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{
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struct timeval end;
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int retval = gettimeofday(&end, NULL);
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if (retval == 0)
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timeval_subtract(&duration->elapsed, &end, &duration->start);
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return retval;
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}
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float duration_elapsed(const struct duration *duration)
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{
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float t = duration->elapsed.tv_sec;
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t += (float)duration->elapsed.tv_usec / 1000000.0;
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return t;
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}
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float duration_kbps(const struct duration *duration, size_t count)
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{
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return count / (1024.0 * duration_elapsed(duration));
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}
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