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/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Sandglass Library. *
* *
* The Sandglass 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 Sandglass 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/>. *
*************************************************************************/
#include "sandglass_impl.h"
#include "sandglass.h"
#include <time.h>
/* Gets the number of clock ticks per second */
double
sandglass_tsc_resolution()
{
static long tsc = 0;
struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
if (tsc == 0) {
tsc = sandglass_get_tsc();
while (nanosleep(&ts, &ts) != 0);
tsc = sandglass_get_tsc() - tsc;
}
return tsc*10.0;
}
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