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/* Test of getting resource utilization.
Copyright (C) 2012-2020 Free Software Foundation, Inc.
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 3 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, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2012. */
#include <config.h>
#include <sys/resource.h>
#include "signature.h"
SIGNATURE_CHECK (getrusage, int, (int, struct rusage *));
#include <sys/time.h>
#include "macros.h"
volatile unsigned int counter;
int
main (void)
{
struct rusage before;
struct rusage after;
int ret;
ret = getrusage (RUSAGE_SELF, &before);
ASSERT (ret == 0);
/* Busy-loop for one second. */
{
struct timeval t0;
ASSERT (gettimeofday (&t0, NULL) == 0);
for (;;)
{
struct timeval t;
int i;
for (i = 0; i < 1000000; i++)
counter++;
ASSERT (gettimeofday (&t, NULL) == 0);
if (t.tv_sec - t0.tv_sec > 1
|| (t.tv_sec - t0.tv_sec == 1 && t.tv_usec >= t0.tv_usec))
break;
}
}
ret = getrusage (RUSAGE_SELF, &after);
ASSERT (ret == 0);
ASSERT (after.ru_utime.tv_sec >= before.ru_utime.tv_sec);
ASSERT (after.ru_stime.tv_sec >= before.ru_stime.tv_sec);
{
/* Compute time spent during busy-looping (in usec). */
unsigned int spent_utime =
(after.ru_utime.tv_sec > before.ru_utime.tv_sec
? (after.ru_utime.tv_sec - before.ru_utime.tv_sec - 1) * 1000000U
+ after.ru_utime.tv_usec + (1000000U - before.ru_utime.tv_usec)
: after.ru_utime.tv_usec - before.ru_utime.tv_usec);
unsigned int spent_stime =
(after.ru_stime.tv_sec > before.ru_stime.tv_sec
? (after.ru_stime.tv_sec - before.ru_stime.tv_sec - 1) * 1000000U
+ after.ru_stime.tv_usec + (1000000U - before.ru_stime.tv_usec)
: after.ru_stime.tv_usec - before.ru_stime.tv_usec);
ASSERT (spent_utime + spent_stime <= 2 * 1000000U);
/* Assume that the load during this busy-looping was less than 100. */
ASSERT (spent_utime + spent_stime > 10000U);
}
return 0;
}
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