glibc (2.38)
1 /* x86 internal mutex struct definitions.
2 Copyright (C) 2019-2023 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
22 struct __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
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