posix/tst-sched_getaffinity.c

   1 /* Tests for sched_getaffinity with large buffers.
   2    Copyright (C) 2021-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <array_length.h>
  20 #include <sched.h>
  21 #include <support/check.h>
  22
  23 /* NB: this test may fail on system with more than 32k cpus.  */
  24
  25 static int
  26 do_test (void)
  27 {
  28   /* The values are larger than the default cpu_set_t.  */
  29   const int bufsize[] = { 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, 1<<16, 1<<17 };
  30   int cpucount[array_length (bufsize)];
  31
  32   for (int i = 0; i < array_length (bufsize); i++)
  33     {
  34       cpu_set_t *cpuset = CPU_ALLOC (bufsize[i]);
  35       TEST_VERIFY (cpuset != NULL);
  36       size_t size = CPU_ALLOC_SIZE (bufsize[i]);
  37       TEST_COMPARE (sched_getaffinity (0, size, cpuset), 0);
  38       cpucount[i] = CPU_COUNT_S (size, cpuset);
  39       CPU_FREE (cpuset);
  40     }
  41
  42   for (int i = 0; i < array_length (cpucount) - 1; i++)
  43     TEST_COMPARE (cpucount[i], cpucount[i + 1]);
  44
  45   return 0;
  46 }
  47
  48 #include <support/test-driver.c>