You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/* timing.c
|
|
|
|
Copyright (C) 2013 Niels Möller
|
|
|
|
This file is part of GNU Nettle.
|
|
|
|
GNU Nettle is free software: you can redistribute it and/or
|
|
modify it under the terms of either:
|
|
|
|
* 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.
|
|
|
|
or
|
|
|
|
* 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.
|
|
|
|
or both in parallel, as here.
|
|
|
|
GNU Nettle 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 copies of the GNU General Public License and
|
|
the GNU Lesser General Public License along with this program. If
|
|
not, see http://www.gnu.org/licenses/.
|
|
*/
|
|
|
|
#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
|
|
}
|