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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Performance counter.
*/
#include "dimension.h"
#include <sys/times.h>
#include <unistd.h>
/** Clock ticks per second. */
static long clk_tck = 0;
dmnsn_timer *
dmnsn_new_timer(void)
{
/* Figure out the clock ticks per second */
if (!clk_tck) {
clk_tck = sysconf(_SC_CLK_TCK);
if (clk_tck == -1) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "sysconf(_SC_CLK_TCK) failed.");
clk_tck = 1000000L;
}
}
dmnsn_timer *timer = dmnsn_malloc(sizeof(dmnsn_timer));
struct tms buf;
clock_t real = times(&buf);
timer->real = (double)real/clk_tck;
timer->user = (double)buf.tms_utime/clk_tck;
timer->system = (double)buf.tms_stime/clk_tck;
return timer;
}
void
dmnsn_complete_timer(dmnsn_timer *timer)
{
struct tms buf;
clock_t real = times(&buf);
timer->real = (double)real/clk_tck - timer->real;
timer->user = (double)buf.tms_utime/clk_tck - timer->user;
timer->system = (double)buf.tms_stime/clk_tck - timer->system;
}
void
dmnsn_delete_timer(dmnsn_timer *timer)
{
dmnsn_free(timer);
}
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