Mercurial > gnulib
view tests/test-getrusage.c @ 40244:c39a0edd90d7
fts: minor simplification
* lib/fts.c (fts_safe_changedir): Remove redundant assignment.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sun, 17 Mar 2019 12:39:50 -0700 |
parents | b06060465f09 |
children |
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/* Test of getting resource utilization. Copyright (C) 2012-2019 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; }