1/* x86 internal rwlock struct definitions.
2 Copyright (C) 2019-2026 Free Software Foundation, Inc.
3
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#ifndef _RWLOCK_INTERNAL_H
21#define _RWLOCK_INTERNAL_H
22
23struct __pthread_rwlock_arch_t
24{
25 unsigned int __readers;
26 unsigned int __writers;
27 unsigned int __wrphase_futex;
28 unsigned int __writers_futex;
29 unsigned int __pad3;
30 unsigned int __pad4;
31#ifdef __x86_64__
32 int __cur_writer;
33 int __shared;
34 unsigned long int __pad1;
35 unsigned long int __pad2;
36 /* FLAGS must stay at this position in the structure to maintain
37 binary compatibility. */
38 unsigned int __flags;
39#else /* __x86_64__ */
40 /* FLAGS must stay at this position in the structure to maintain
41 binary compatibility. */
42 unsigned char __flags;
43 unsigned char __shared;
44 unsigned char __pad1;
45 unsigned char __pad2;
46 int __cur_writer;
47#endif
48};
49
50#ifdef __x86_64__
51# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
52 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags
53#else
54# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
55 0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0
56#endif
57
58#endif
59