1 /* C11 threads call_once test.
2    Copyright (C) 2018-2021 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 <threads.h>
20 #include <stdio.h>
21 #include <unistd.h>
22 
23 #include <support/check.h>
24 
25 /* Flag that controls the first thread access.  */
26 static once_flag flag = ONCE_FLAG_INIT;
27 
28 static int value = 0;
29 
30 static void
do_once(void)31 do_once (void)
32 {
33   value++;
34 }
35 
36 static int
func(void * data)37 func (void* data)
38 {
39   call_once (&flag, do_once);
40   thrd_exit (thrd_success);
41 }
42 
43 #define N 20
44 
45 int
do_test(void)46 do_test (void)
47 {
48   thrd_t ids[N];
49 
50   for (int i = 0; i < N; ++i)
51     {
52       if (thrd_create (&ids[i], func, NULL) != thrd_success)
53 	FAIL_EXIT1 ("thrd_create failed");
54     }
55 
56   /* Join threads.  */
57   for (int i = 0; i < N; ++i)
58     {
59       if (thrd_join (ids[i], NULL) != thrd_success)
60 	FAIL_EXIT1 ("thrd_join failed");
61     }
62 
63   return (value != 1);
64 }
65 
66 #include <support/test-driver.c>
67