htl/tests/test-12.c

   1 /* Test concurrency level.
   2    Copyright (C) 2000-2023 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 #define _GNU_SOURCE
  20
  21 #include <pthread.h>
  22 #include <assert.h>
  23 #include <error.h>
  24 #include <errno.h>
  25
  26 int
  27 main (int argc, char **argv)
  28 {
  29   int i;
  30   int err;
  31
  32   i = pthread_getconcurrency ();
  33   assert (i == 0);
  34
  35   err = pthread_setconcurrency (-1);
  36   assert (err == EINVAL);
  37
  38   err = pthread_setconcurrency (4);
  39   assert (err == 0);
  40
  41   i = pthread_getconcurrency ();
  42   assert (i == 4);
  43
  44   return 0;
  45 }