forked from gary-funck/parallel-merge-sort
/
get_time.c
68 lines (58 loc) · 1.65 KB
/
get_time.c
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/* get_time() function.
Copyright (C) 2015 Gary Funck <gary@intrepid.com>
This program 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 2 of
the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#if _POSIX_TIMERS
#include <time.h>
#ifdef CLOCK_MONOTONIC_RAW
/* System clock id passed to clock_gettime. CLOCK_MONOTONIC_RAW
is preferred. It has been available in the Linux kernel
since version 2.6.28 */
#define SYS_RT_CLOCK_ID CLOCK_MONOTONIC_RAW
#else
#define SYS_RT_CLOCK_ID CLOCK_MONOTONIC
#endif
double
get_time (void)
{
struct timespec ts;
double t;
if (clock_gettime (SYS_RT_CLOCK_ID, &ts) != 0)
{
perror ("clock_gettime");
abort ();
}
t = (double) ts.tv_sec + (double) ts.tv_nsec * 1.0e-9;
return t;
}
#else /* !_POSIX_TIMERS */
#include <sys/time.h>
double
get_time (void)
{
struct timeval tv;
double t;
if (gettimeofday (&tv, NULL) != 0)
{
perror ("gettimeofday");
abort ();
}
t = (double) tv.tv_sec + (double) tv.tv_usec * 1.0e-6;
return t;
}
#endif