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/* vim: set tabstop=4 expandtab shiftwidth=4 softtabstop=4: */
/*
* Copyright 2015 University of Piemonte Orientale, Computer Science Institute
*
* This file is part of UPOalglib.
*
* UPOalglib 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 3 of the License, or
* (at your option) any later version.
*
* UPOalglib 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 UPOalglib. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "timer_private.h"
upo_timer_t upo_timer_create()
{
upo_timer_t timer = NULL;
timer = malloc(sizeof(struct upo_timer_s));
if (timer == NULL)
{
upo_timer_throw_error(strerror(errno));
}
/* Invalidates the timer */
timer->start = timer->stop = -1;
return timer;
}
void upo_timer_destroy(upo_timer_t timer)
{
if (timer != NULL)
{
free(timer);
}
}
void upo_timer_start(upo_timer_t timer)
{
if (timer == NULL)
{
upo_timer_throw_error("Invalid timer argument");
}
time(&timer->start);
timer->stop = -1;
}
void upo_timer_stop(upo_timer_t timer)
{
if (timer == NULL)
{
upo_timer_throw_error("Invalid timer argument");
}
if (!upo_timer_is_stopped(timer))
{
time(&timer->stop);
}
}
int upo_timer_is_started(const upo_timer_t timer)
{
if (timer == NULL)
{
upo_timer_throw_error("Invalid timer argument");
}
return (timer->start != -1) ? 1 : 0;
}
int upo_timer_is_stopped(const upo_timer_t timer)
{
if (timer == NULL)
{
upo_timer_throw_error("Invalid timer argument");
}
return timer->stop != -1 ? 1 : 0;
}
double upo_timer_elapsed(const upo_timer_t timer)
{
if (timer == NULL)
{
upo_timer_throw_error("Invalid timer argument");
}
if (upo_timer_is_stopped(timer))
{
/* The timer is stopped: returns the length of the [start,stop) interval */
return difftime(timer->stop, timer->start);
}
if (upo_timer_is_started(timer))
{
/* The timer isn't stopped: returns the time elapsed so far */
return difftime(time(NULL), timer->start);
}
return -1;
}
void upo_timer_throw_error(const char *msg)
{
assert(msg);
fprintf(stderr, "[file: %s, line: %d] %s\n", __FILE__, __LINE__, msg);
abort();
}