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/* timing.c */
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Niels Möller
*
* The nettle 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 2.1 of the License, or (at your
* option) any later version.
*
* The nettle 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 the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "timing.h"
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#if HAVE_CLOCK_GETTIME && defined CLOCK_PROCESS_CPUTIME_ID
#define TRY_CLOCK_GETTIME 1
struct timespec cgt_start;
static void NORETURN PRINTF_STYLE(1,2)
die(const char *format, ...)
{
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
exit(EXIT_FAILURE);
}
static int
cgt_works_p(void)
{
struct timespec now;
return clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &now) == 0;
}
static void
cgt_time_start(void)
{
if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &cgt_start) < 0)
die("clock_gettime failed: %s\n", strerror(errno));
}
static double
cgt_time_end(void)
{
struct timespec end;
if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end) < 0)
die("clock_gettime failed: %s\n", strerror(errno));
return end.tv_sec - cgt_start.tv_sec
+ 1e-9 * (end.tv_nsec - cgt_start.tv_nsec);
}
#endif /* !HAVE_CLOCK_GETTIME */
static clock_t clock_start;
static void
clock_time_start(void)
{
clock_start = clock();
}
static double
clock_time_end(void)
{
return (double) (clock() - (clock_start)) / CLOCKS_PER_SEC;
}
void (*time_start)(void) = clock_time_start;
double (*time_end)(void) = clock_time_end;
void time_init(void)
{
/* Choose timing function */
#if TRY_CLOCK_GETTIME
if (cgt_works_p())
{
time_start = cgt_time_start;
time_end = cgt_time_end;
}
else
{
fprintf(stderr, "clock_gettime not working, falling back to clock\n");
time_start = clock_time_start;
time_end = clock_time_end;
}
#endif
}
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