1/* S390 internal mutex struct definitions.
 2   Copyright (C) 2019-2025 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#if __WORDSIZE == 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#if __WORDSIZE == 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 __elision;
46    } _d;
47#  define __spins _d.__espins
48#  define __elision _d.__elision
49    __pthread_slist_t __list;
50  };
51# define __PTHREAD_MUTEX_HAVE_PREV      0
52#endif
53};
54
55#if __WORDSIZE == 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