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Diffstat (limited to 'gnulib-tests/test-getrusage.c')
-rw-r--r-- | gnulib-tests/test-getrusage.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/gnulib-tests/test-getrusage.c b/gnulib-tests/test-getrusage.c new file mode 100644 index 0000000..ef8c806 --- /dev/null +++ b/gnulib-tests/test-getrusage.c @@ -0,0 +1,86 @@ +/* Test of getting resource utilization. + Copyright (C) 2012-2022 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; +} |