blob: 3e345bc9b80008e3feb6eaca5eec15db5ea0a6a3 (
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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/* pthread_once. Generic version.
Copyright (C) 2002-2021 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 <pthread.h>
#include <atomic.h>
#include <pt-internal.h>
static void
clear_once_control (void *arg)
{
pthread_once_t *once_control = arg;
__pthread_spin_unlock (&once_control->__lock);
}
int
__pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
{
ASSERT_TYPE_SIZE (pthread_once_t, __SIZEOF_PTHREAD_ONCE_T);
atomic_full_barrier ();
if (once_control->__run == 0)
{
__pthread_spin_wait (&once_control->__lock);
if (once_control->__run == 0)
{
pthread_cleanup_push (clear_once_control, once_control);
init_routine ();
pthread_cleanup_pop (0);
atomic_full_barrier ();
once_control->__run = 1;
}
__pthread_spin_unlock (&once_control->__lock);
}
return 0;
}
weak_alias (__pthread_once, pthread_once);
|
