1/* RISC-V 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   <https://www.gnu.org/licenses/>.  */
19
20#ifndef _RWLOCK_INTERNAL_H
21#define _RWLOCK_INTERNAL_H
22
23/* There is a lot of padding in this structure.  While it's not strictly
24   necessary on RISC-V, we're going to leave it in to be on the safe side in
25   case it's needed in the future.  Most other architectures have the padding,
26   so this gives us the same extensibility as everyone else has.  */
27struct __pthread_rwlock_arch_t
28{
29  unsigned int __readers;
30  unsigned int __writers;
31  unsigned int __wrphase_futex;
32  unsigned int __writers_futex;
33  unsigned int __pad3;
34  unsigned int __pad4;
35#if __WORDSIZE == 64
36  int __cur_writer;
37  int __shared;
38  unsigned long int __pad1;
39  unsigned long int __pad2;
40  unsigned int __flags;
41#else
42# if __BYTE_ORDER == __BIG_ENDIAN
43  unsigned char __pad1;
44  unsigned char __pad2;
45  unsigned char __shared;
46  unsigned char __flags;
47# else
48  unsigned char __flags;
49  unsigned char __shared;
50  unsigned char __pad1;
51  unsigned char __pad2;
52# endif
53  int __cur_writer;
54#endif
55};
56
57#if __WORDSIZE == 64
58# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
59  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags
60#elif __BYTE_ORDER == __BIG_ENDIAN
61# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
62  0, 0, 0, 0, 0, 0, 0, 0, 0, __flags, 0
63#else
64# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \
65  0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0
66#endif
67
68#endif