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- /***************************************************************************
- * 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, see <http://www.gnu.org/licenses/>. *
- ***************************************************************************/
-
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include "time_support.h"
-
- /* 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;
- }
-
- int timeval_add_time(struct timeval *result, long sec, long usec)
- {
- result->tv_sec += sec;
- result->tv_usec += usec;
-
- while (result->tv_usec > 1000000) {
- result->tv_usec -= 1000000;
- result->tv_sec++;
- }
-
- return 0;
- }
-
- /* compare two timevals and return -1/0/+1 accordingly */
- int timeval_compare(const struct timeval *x, const struct timeval *y)
- {
- if (x->tv_sec < y->tv_sec)
- return -1;
- else if (x->tv_sec > y->tv_sec)
- return 1;
- else if (x->tv_usec < y->tv_usec)
- return -1;
- else if (x->tv_usec > y->tv_usec)
- return 1;
- else
- return 0;
- }
-
- int duration_start(struct duration *duration)
- {
- return gettimeofday(&duration->start, NULL);
- }
-
- int duration_measure(struct duration *duration)
- {
- struct timeval end;
- int retval = gettimeofday(&end, NULL);
- if (retval == 0)
- timeval_subtract(&duration->elapsed, &end, &duration->start);
- return retval;
- }
-
- float duration_elapsed(const struct duration *duration)
- {
- float t = duration->elapsed.tv_sec;
- t += (float)duration->elapsed.tv_usec / 1000000.0;
- return t;
- }
-
- float duration_kbps(const struct duration *duration, size_t count)
- {
- return count / (1024.0 * duration_elapsed(duration));
- }
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