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1/* pthread_once. Generic version.
2 Copyright (C) 2002-2019 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 <http://www.gnu.org/licenses/>. */
18
19#include <pthread.h>
20#include <atomic.h>
21
22#include <pt-internal.h>
23
24int
25__pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
26{
27 atomic_full_barrier ();
28 if (once_control->__run == 0)
29 {
30 __pthread_spin_lock (&once_control->__lock);
31
32 if (once_control->__run == 0)
33 {
34 init_routine ();
35 atomic_full_barrier ();
36 once_control->__run = 1;
37 }
38
39 __pthread_spin_unlock (&once_control->__lock);
40 }
41
42 return 0;
43}
44strong_alias (__pthread_once, pthread_once);
45

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