86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Test of getting resource utilization.
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Copyright (C) 2012-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2012. */
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#include <config.h>
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#include <sys/resource.h>
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#include "signature.h"
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SIGNATURE_CHECK (getrusage, int, (int, struct rusage *));
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#include <sys/time.h>
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#include "macros.h"
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volatile unsigned int counter;
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int
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main (void)
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{
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struct rusage before;
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struct rusage after;
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int ret;
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ret = getrusage (RUSAGE_SELF, &before);
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ASSERT (ret == 0);
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/* Busy-loop for one second. */
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{
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struct timeval t0;
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ASSERT (gettimeofday (&t0, NULL) == 0);
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for (;;)
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{
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struct timeval t;
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int i;
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for (i = 0; i < 1000000; i++)
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counter++;
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ASSERT (gettimeofday (&t, NULL) == 0);
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if (t.tv_sec - t0.tv_sec > 1
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|| (t.tv_sec - t0.tv_sec == 1 && t.tv_usec >= t0.tv_usec))
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break;
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}
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}
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ret = getrusage (RUSAGE_SELF, &after);
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ASSERT (ret == 0);
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ASSERT (after.ru_utime.tv_sec >= before.ru_utime.tv_sec);
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ASSERT (after.ru_stime.tv_sec >= before.ru_stime.tv_sec);
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{
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/* Compute time spent during busy-looping (in usec). */
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unsigned int spent_utime =
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(after.ru_utime.tv_sec > before.ru_utime.tv_sec
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? (after.ru_utime.tv_sec - before.ru_utime.tv_sec - 1) * 1000000U
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+ after.ru_utime.tv_usec + (1000000U - before.ru_utime.tv_usec)
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: after.ru_utime.tv_usec - before.ru_utime.tv_usec);
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unsigned int spent_stime =
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(after.ru_stime.tv_sec > before.ru_stime.tv_sec
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? (after.ru_stime.tv_sec - before.ru_stime.tv_sec - 1) * 1000000U
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+ after.ru_stime.tv_usec + (1000000U - before.ru_stime.tv_usec)
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: after.ru_stime.tv_usec - before.ru_stime.tv_usec);
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ASSERT (spent_utime + spent_stime <= 2 * 1000000U);
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/* Assume that the load during this busy-looping was less than 100. */
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ASSERT (spent_utime + spent_stime > 10000U);
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}
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return test_exit_status;
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}
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