1 /* Test concurrency level.
2    Copyright (C) 2000-2022 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
main(int argc,char ** argv)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 }
46