about summary refs log tree commit diff
path: root/nptl/call_once.c
blob: 3f880a90731df4bb4b4641d0420ae727f7072d64 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
/* C11 threads call once implementation.
   Copyright (C) 2018-2020 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <stdalign.h>

#include "thrd_priv.h"

void
call_once (once_flag *flag, void (*func)(void))
{
  _Static_assert (sizeof (once_flag) == sizeof (pthread_once_t),
		  "sizeof (once_flag) != sizeof (pthread_once_t)");
  _Static_assert (alignof (once_flag) == alignof (pthread_once_t),
		  "alignof (once_flag) != alignof (pthread_once_t)");
  __pthread_once (&flag->__data, func);
}