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/*
* The Rin Library – time module, benchmarking section
*
* Copyright (C) 2019 Gediminas Jakutis
*
* This 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; version 2.1
* of the License.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <time.h>
#include <errno.h>
#include <sys/resource.h>
#include "rin/time.h"
#include "time_private.h"
#if defined CLOCK_MONOTONIC
# define RIN_CLOCK_WALL_COUNTER CLOCK_MONOTONIC
#else
# define RIN_CLOCK_WALL_COUNTER CLOCK_REALTIME
#endif /* defined CLOCK_MONOTONIC */
static struct bench {
int status;
struct rusage runtime;
struct timespec wall;
} bench = {0};
int rin_bench_start(void)
{
if (bench.status) {
return EAGAIN;
}
bench.status = 1;
clock_gettime(RIN_CLOCK_WALL_COUNTER, &bench.wall);
getrusage(RUSAGE_SELF, &bench.runtime);
return 0;
}
int rin_bench_stop(struct rin_bench_result *res)
{
struct timespec wall;
struct rusage run;
if (!bench.status) {
return EAGAIN;
}
if (!res) {
return EINVAL;
}
getrusage(RUSAGE_SELF, &run);
clock_gettime(RIN_CLOCK_WALL_COUNTER, &wall);
res->wall = rin_time_sub(&wall, &bench.wall);
res->system = rin_timeval_sub(&run.ru_stime, &bench.runtime.ru_stime);
res->user = rin_timeval_sub(&run.ru_utime, &bench.runtime.ru_utime);
res->total = rin_timeval_add(&res->system, &res->user);
bench.status = 0;
return 0;
}
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