1/* x86 internal rwlock struct definitions.
 2   Copyright (C) 2019-2025 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  signed char __rwelision;
35# ifdef  __ILP32__
36  unsigned char __pad1[3];
37#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0 }
38# else
39  unsigned char __pad1[7];
40#  define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0, 0, 0, 0, 0 }
41# endif
42  unsigned long int __pad2;
43  /* FLAGS must stay at this position in the structure to maintain
44     binary compatibility.  */
45  unsigned int __flags;
46#else /* __x86_64__  */
47  /* FLAGS must stay at this position in the structure to maintain
48     binary compatibility.  */
49  unsigned char __flags;
50  unsigned char __shared;
51  signed char __rwelision;
52  unsigned char __pad2;
53  int __cur_writer;
54#endif
55};
56
57#ifdef __x86_64__
58# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
59  0, 0, 0, 0, 0, 0, 0, 0, __PTHREAD_RWLOCK_ELISION_EXTRA, 0, __flags
60#else
61# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
62  0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0
63#endif
64
65#endif