glibc/htl/tests/test-12.c

/* Test concurrency level.
   Copyright (C) 2000-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If
   not, see <http://www.gnu.org/licenses/>.  */

#define _GNU_SOURCE

#include <pthread.h>
#include <assert.h>
#include <error.h>
#include <errno.h>

int
main (int argc, char **argv)
{
  int i;
  int err;

  i = pthread_getconcurrency ();
  assert (i == 0);

  err = pthread_setconcurrency (-1);
  assert (err == EINVAL);

  err = pthread_setconcurrency (4);
  assert (err == 0);

  i = pthread_getconcurrency ();
  assert (i == 4);

  return 0;
}