1/* x86 internal mutex struct definitions.
2 Copyright (C) 2019-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _THREAD_MUTEX_INTERNAL_H
20#define _THREAD_MUTEX_INTERNAL_H 1
21
22struct __pthread_mutex_s
23{
24 int __lock;
25 unsigned int __count;
26 int __owner;
27#ifdef __x86_64__
28 unsigned int __nusers;
29#endif
30 /* KIND must stay at this position in the structure to maintain
31 binary compatibility with static initializers. */
32 int __kind;
33#ifdef __x86_64__
34 short __spins;
35 short __elision;
36 __pthread_list_t __list;
37# define __PTHREAD_MUTEX_HAVE_PREV 1
38#else
39 unsigned int __nusers;
40 __extension__ union
41 {
42 struct
43 {
44 short __espins;
45 short __eelision;
46# define __spins __elision_data.__espins
47# define __elision __elision_data.__eelision
48 } __elision_data;
49 __pthread_slist_t __list;
50 };
51# define __PTHREAD_MUTEX_HAVE_PREV 0
52#endif
53};
54
55#ifdef __x86_64__
56# define __PTHREAD_MUTEX_INITIALIZER(__kind) \
57 0, 0, 0, 0, __kind, 0, 0, { 0, 0 }
58#else
59# define __PTHREAD_MUTEX_INITIALIZER(__kind) \
60 0, 0, 0, __kind, 0, { { 0, 0 } }
61#endif
62
63#endif
64